508 



MEDUSAE OF THE WORLD. 



Synopsis of the Species of Carybdea* 



* For C. aurifera see text. 



cirri are brush-like, and in each cluster about 8 to 10 primary branches arise, and each gives 

 off 2 to 3 lateral branches, each of which terminates in a brush of 10 to 13 filaments. There 

 are thus 100 to 150 of these terminal filaments in each interradial cluster of gastric cirri. 

 The gonads are 8 leaf-like expansions on both sides of the 4 interradial septa. They extend 

 not quite to the velar margin or to the interradial edges of the stomach. 



Bell and pedalia dull milky-ocher, due to the color of the exumbrella nematocyst-warts. 

 Flexible parts of tentacles dull pink. Ocelli very dark brown, nearly black; basal branches 

 of gastric cirri dull horny-brown. 



The medusa is common in the Mediterranean, but its development remains unknown. 

 Claus, 1878, gives a detailed account of its anatomy and histology. When young it apparently 

 remains in deep water probably at or near the bottom, but when mature it swims upward to 

 the surface. 



Carybdea rastonii Haacke. 



Charybdea rastonii, HAACKZ, :8S6, Zool. Anzeiger, Bd. 9, p. 554; 1887, Jena, Zeit. fur Naturwissen., Bd. 20, p. 591, taf. 35, fign. 



1-15; 1888, Biol. Centralblatt, BJ. 8, p. 357. VON LENDENFELD, 1888, Biolog. Centralblatt, BJ. 8, p. 218. MAYER, 1906, 



Bull. U.S. Fish Commission, vol. 23, Part 3, 1 903, p. 1134, plate i, figs, i-ic. BICELOW, H. B., 1909, Mem. Mus. Comp. 



Zool. at Harvard College, vol. 37, p. 17, plates I and 10. MAAS, 1909, Abhandl. Akad. Wissen., Miinchen, Suppl. Bd. 



i, Abhandl. 8, p. 41. 



Char\bdeaarborifera (young medusa), MAAS, 1897, Mem. Museum Comp. Zool. at Harvard College, vol. 23, p. 86, taf. 14, fign. 7-10. 

 Procharagma prototypus (young medusa?), HAECKEL, 1880, Syst. der Medusen, p. 436, taf. 25, fign. I, i.Procharybdis cuboides, 



Ibid., p. 439. 



Bell nearly cubical, with flatly rounded top and nearly plane vertical sides. 35 mm. high, 

 25 to 30 mm. wide. Pedalia small, only one-third to one-fourth as long as bell-height, and 



