. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ECIIINOIDEA. 11. 53 here; it is, however, evidenth' not very correctly drawn. 1 have seen nothing re.senibhng the fignre.s PI. XLIII. lo—II; tlie- prol)al)l- repre.sent onh small si)eciniens of this kind of tridentate pedicellariae. The .second form (PL X. P^igs. i, 4, 24, 28, 29) is coarser and the form of the blade often somewhat irre- gular; it has generalh' some ery irregular mesh work. This kind of pedicellariaj is found on the actinal side, and especialh' ou the peristome, even in
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. The Danish Ingolf-expedition. Marine animals -- Arctic regions; Scientific expeditions; Arctic regions. ECIIINOIDEA. 11. 53 here; it is, however, evidenth' not very correctly drawn. 1 have seen nothing re.senibhng the fignre.s PI. XLIII. lo—II; tlie- prol)al)l- repre.sent onh small si)eciniens of this kind of tridentate pedicellariae. The .second form (PL X. P^igs. i, 4, 24, 28, 29) is coarser and the form of the blade often somewhat irre- gular; it has generalh' some ery irregular mesh work. This kind of pedicellariaj is found on the actinal side, and especialh' ou the peristome, even in the mouth they are quite crowded, reaching some wav up the oesophagus; those found here are generally more irregular than those on the out- side of the test (PI. X. Figs. 28—29).— It is probably this second form of tridentate pedicellarite which is figured in PI. XLIII. Fig. 12 of the Challenger >-Ech. under the name of Clypeastroid-like pedi- cellaria; the valve represented in PI. XLV. Fig. 35 as belonging to this form is certainly that of an ophicephalous pedicellaria, but it seems very unlikely that it can belong to this form; the figure PI. XLIII. 12 does not seem so very bad, as it would be in case the alve did really belong to it — and on the other hand, this coarse form of tridentate pedicellarise is generalh- invested with a rather thick, brown skin, so that b- a superficial examination not much more is seen than the figure cited shows. — The ophicephalous pedicellarife are like those of P. Rathbuiii. the valves being low and rather broad. The PI. XLV. Fig. 35 of the .Challenger -Ech. gives a rather good representation thereof. The figures PI. XXXV. 17—18 may perhaps also represent the ophicephalous pedicellaria;; they are however, so crudeh- made that it is quite useless to speculate on what they are meant to represent. — The triphvUous pedicellarise are like those of P. Rathbmu. The supporting rods of the filaments of the actinal tube-feet are like