The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . J. 6 Wm, Vll.—Section through Incomplete Eegenerated Head, with one eye, 64 days (text-fig. Ill, 5). e., eye ; ^., gut; ga., ganglion ; op,n,, optic nerve. Cut upon Regeneration in Gunda ulvse. 363 060.0 • -? a 11 LI ^ -< , . j?a.e^^...

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RM2AKNDYJ–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae .

RM2AKN9T6–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . 5; *?^--^xT;*?•../ <^ Fig. VIII.—Section through Headless Form, 62 days (text-iig. Ill, 6). e^.c, excretorycanals ; ^., got; ?2,.c., nerve cords ; pa.c, parenchyma cells ; p.c, pigment cells.

RM2AKNAXT–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ^<?, iG. VI.—Section fclirough Incomplete Regenerated Head, with two eyes, 62 days (text-fig. Ill, 4). exx., excretory canal; ga.^ ganglion; g., gut; n.c, nerve cord; op.n.,optic nerve.. ,€ op,n.

RM2AKNAK2–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ,€ op,n.. J. 6 Wm, Vll.—Section through Incomplete Eegenerated Head, with one eye, 64 days (text-fig. Ill, 5). e., eye ; ^., gut; ga., ganglion ; op,n,, optic nerve. Cut upon Regeneration in Gunda ulvse. 363 060.0 • -? a 11 LI ^ -< , . j?a.e^^..

RM2AKN8RM–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ... qp.n. ga ® Fjg. V.—Horizontal Longitudinal Section through Complete Regenerated Head, 41 days(text-fig. Ill, 3). ga., ganglion ; n.c., nerve cord ; op.n., optic nerve.. Fig. VI.—Section through Incompletefig. IIT, 4). ex.c, excretory canaloptic nerve. Head, with two eyes, 62 days (text-, ganglion ; g., gut; n.c, nerve cord ; op.n.y

RM2AKND7R–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ircuit of the nervous system is restored, often before the longwound has healed over. Transverse sections across the ganglia, however,are not followed by regeneration of the ganglia if more than about one-thirdof the brain is taken away. The nervous system forms a complete ring, andin every case, where this ring is broken, regeneration of the nerve cords takesplace sufficiently to restore the circuit, though the cerebral ganglia may ormay not be regenerated. Text-fig. V shows an animal (text-fig. Ill, 3) where the cut

RM2AKNDE5–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . Fig. IV.1 and 2. Fragment ACC, 20 days. A longitudinal section through a heteromorphic form is shown in fig. IX.The rounded shape of the section is due to the contraction that takesplace when the animals are dropped into the fixing fluid. It can be seenin the section that about one-third of the complete brain is present. Twowell-marked nerves run to the new eyes, and the portion of regeneratedgut in the new head shows a beginning of the formation of the three branchescharacteristic of the front end of the gut of G. ulv

RM2AKN93M–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ranes. By S, B. SCHKYVER. (Communicated by Prof. V. H. Blackman, F.R.S. Received January 22,—Read February 19, 1914.) In the first communication under the above title,* attention was called to thefact that solutions of sodium cholate, on warming in the presence of calciumsalts, set to a gel, which is not reversible on cooling. It has since been foundthat calcium salts can be replaced by other salts, such as sodium chloride,,magnesium chloride, ammonium sulphate and potassium fluoride, and the clotformation is not there

RM2AKNDP0–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ys. 6. Fragment DDP, 41 and62 days. no head formation ever occurs. These posterior pieces showed some changeof form, as forward growth caused them to become helmet shaped (fig. 6).After two months these pieces still remained without any attempt at regenera-tion of the head. A number of headless pieces and defective heads were sectioned forexamination of the nervous system, and the sections are shown. 360 Miss D. J. Lloyd. Influence of the Position of the It is obvious that in cases of incomplete regulation the central

RM2AKN9FK–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ^^r-. ;e5.^. Fig. IX.—Section through IBEeteromorphic Head, 20 days (text-fig. IV, 8). e., eye ; (/., gut; ga., ganglion : op.n.^ optic nerve ; pa.c, parenchyma cells. IV. Discussion.As was mentioned earlier in the paper, Child (1) has already shownthat the presence of at least half the cerebral ganglia is necessary forcomplete regeneration in Leptoplancc. The removal of more than half VOL. LXXXVII.—B. 2 E 364 Miss D. J. Lloyd. Influence of the Position of the the ganglia causes the production of defective heads. When

RM2AKNCXK–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . Fig. V.—Horizontal Longitudinal Section through Complete Eegenerated Head, 41 days(text-fig. Ill, 3). ^a., ganglion ; nx.^ nerve cord ; op.n.^ optic nerve. 362 Miss D. J. Lloyd. Influence of the Position of the op.n^. ^-v. ^<?, iG. VI.—Section fclirough Incomplete Regenerated Head, with two eyes, 62 days (text-fig. Ill, 4). exx., excretory canal; ga.^ ganglion; g., gut; n.c, nerve cord; op.n.,optic nerve.

RM2AKN8BN–The Influence of the Position of the Cut upon Regeneration in Gunda Ulvae . ?op.n. l- Fia. VII.—Section through Intxunplete Regenerated Head, with one eye, 64 days (text-fig. Ill, 5). e., eye; g.^ gut; ga.^ ganglion ; op.n., optic nerve. jnESSSEHHi 9 ?: ? p.c. ^f Fig. VIII.—Section through Headless Form, 62 days (text-tig. Ill, G). ex.c, excretory-canals ; ff,, gut; n.c.f nerve cords ; pa.c., parenchyma cells ; p.c, pigment cells.. Fig. IX.—Section through Heteromorphie Head, 20 days (text-fig. IV, 8). e., eye ;^., gut;ga., ganglion : op.n.^ optic nerve ; pa.c, parenchyma cells.

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