. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world. ameter,and becomes a fully formed Aurelia in April,reaching maturity in August. Another but lesscommon jellyfish on the coast of New Eng-land and in the North Atlantic is the greatCyanea arctica, or blue jelly, which is nearlytwo feet in diameter, sometimes from three tofive, and with very long string-like tentacles,sometimes extending from 20 to 100 feet, whichare filled with stinging or lasso-cells (tricho-cysts), so that the animal is poi
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. The Americana : a universal reference library, comprising the arts and sciences, literature, history, biography, geography, commerce, etc. of the world. ameter, and becomes a fully formed Aurelia in April, reaching maturity in August. Another but lesscommon jellyfish on the coast of New Eng-land and in the North Atlantic is the greatCyanea arctica, or blue jelly, which is nearlytwo feet in diameter, sometimes from three tofive, and with very long string-like tentacles, sometimes extending from 20 to 100 feet, whichare filled with stinging or lasso-cells (tricho-cysts), so that the animal is poisonous to fisher-men and bathers. While these forms undergo ametamorphosis, in fact, an alternation of gen-eration ; other kinds, as Pclagia, etc., are knownto develop directly from the egg, and even theaurelia under exceptional circumstances doesnot pass through the scyphistoma stage. Thejellyfishes are divided into a number of groups.They are most numerous in the tropical seas, comprising forms of great beauty. Consult:Romanes, Jellyfish, Starfish and Sea Urchins(1885); Packard, Zoology (1897); Arnold, The Sea Beach at Ebb-tide (1902). JELLYFISHES.. Fl IRMS Ol DISCOM1 I>I - 1i. Pilema giltschii. (</t natural sizi I -l Rhopilema frida (K natural size) 2. View of the same from above (the organs seen 5. Brachiolophus collaris (% natural size). through the transparent convex disk or nm- 6. Cannorrhiza connexa. brell.i 7. The same, from beneath. 1 _. natural ?ize). 3. View of the same from beneath. JENA —JENKINS FERRY Jena, y.Vna, Germany, town - miles eastof Weimar, on the left bank of the Saale. Itlists of the town proper and of four suburbs, and is a dull antiquated place. It contains afamous university which was opened in 1558, and attained its highest prosperity toward theend of the i8tb century, when it numberedSchiller, Humboldt, Fichte, Schilling, andGriesbach among its teachers, and was attended by above 1, 000 students. In 1844 the number baddwindled down to 411 ; bu