MEDUS.« OF THE WORLD. 

 Synopsis of the Forms of Pelagia — Continued. 



♦Development through a pelagic larva without strobilization or alternation of generation, Haeckel, 1867. 



Griffiths and Piatt, 1895 (Nature, vol. 52, p. 564), find that the violet pigment of Pelagia 

 has the composition C,, H,, NO7. It is soluble in alcohol, ether, and acetic acid, and especially 

 soluble in CS2. Insoluble in water. It gives no characteristic absorption bands. It is thus 

 quite distinct from the blue coloring matter of Hydromedusae as determined by Colasanti, 1888 

 (Centralblatt fiir Ph)siol., Bd. 2, p. 10). 



Pelagia noctiluca P^ron and Lesueur. 

 Plate 60, figs. I to 3. 



Midusa noctiluca, Forskal, 1775, Dcscript anim. itin. orient., p. 109. 



Pelagia noctiluca, PtRON ET Lksuf.ub, 1809, Annal. du Mus. Hist. Nat., tome 14, p. 350; P. purpura, Aurellia phospliorica, 

 loc.cil., pp. 350, 358. — Krohn, 185;, Midler's .Archiv. Anat. Physiol., p. 491, taf. 20 (development). — Haeckel, 1S80, 

 Syst. dcr Meduscn. p. 505 (list of authors and names). — Kowalevskv, 1873, Mem. Imp. Soc. Lovers of Nat. Hist., 

 Moscow, vol. 10, part. 2, p. 7, plate 3 (development). — Hamann, 1883, Zcit. fiir wisscn. Zool.,Bd. 38, p. 422, taf. 32 (develop- 

 ment and structure of gonads). — Metschnikoff, 1886, Embryol. Studien an Medusen, Wien., p. 24 (egg); 67 (segmenta- 

 tion); ioo(Ian,a): taf. 10, fign. 23-28.— Monaco, Prince of, 1887, Comp. Rend. Paris, tome 104, p. 452 (swarming habits 

 of the medusa).— Vanhoffen, 1888, Bibliotheca Zoologica, Heft. 3, p. 8, taf . i, fign. 5, 6; taf. 6, fign. 1-5; i9o8,Deutsch. 

 Siidpolar Expedition, 1901-1903, Bd. 10, Zool. 2, p. 38.— Goette, 1893, Zeit. fiir wisscn. Zool., Bd. 55, p. 659, 11 fign., 

 taf. 30-31; 1893, Sit/.ungsber. Akad. Wissen. Berlin, p. 853 (development). — Schaxei, 1910, Zool. Anzeiger, Bd. 35, p. 

 407 (histology of oogenesis). 



The following is a description of a t)pical, adult specimen from the Hay of Naples: 

 Disk somewhat higher than a hemisphere when contracted, but flatter than a hemisphere 



