42 Bulletin, Vanderoilt Marine Museum, Vol. IV 



pi. 29, figs. 1-9, 1881. — Roule, Res. Sci. Campag. Caudan, t. I, 

 Lyon, p. 302, 1896.— Maas, Mem. Mus. Comp. Zool., vol. 23, p. 79, 

 1897; Exped. Antarctique Francaise, vol. VII, p. 13, 1908. — 

 Vanhoffen, Deutsche Tiefsee Exped. Valdivia, Bd. 3, Lfg. 1, 

 p. 13, taf. 5, fig. 22, 1902; Deutsche Sudpolar Exped. Bd. 10, 

 Zool., 2, p. 37, 1908.— Browne, Trans. Royal Soc. Edinburgh, 

 vol. 46, p. 241, 1908.— Bigelow, H. B., Mem. Mus. Comp. Zool., 

 vol. 37, p. 39, pis. 8-10, 1909.— Mayer, A. G., Medusae of the 

 World, vol. Ill, p. 566, fig. 359, 1910 ; Publ. 109, Carnegie Inst, 

 of "Washington, (with full synonymy). 



Atolla alexandri Maas, Mem. Mus. Comp. Zool., vol. 23, p. 81, taf. 11, 

 fig. 2, taf. 14, figs. 4, 5, 1897. — Agassiz, A., and Mater, A. G., 

 Mem. Mus. Comp. Zool., vol. 26, p. 156, 1902.— Mayer, A. G., Bull. 

 U. S. Fish Comm., vol. 23, p. 1138, pi. 2, fig. 7, pi. 3, figs. 10, 11, 

 1906. 



Order: RHIZOSTOMAE. 

 Rhizostommata Pinnata Vanhoffen. 

 Genus : CASSIOPEA Peron and Lesueur. 

 Cassiopea xamachana H. B. Bigelow. 



Plate 7. 



Name : This specific name is derived from the ancient Indian name 

 for Jamaica. 



Type: Dr. Bigelow discovered this species in great abundance in a 

 salt water lagoon named Great Salt Pond, near Port Henderson, 

 Kingston Harbor, Jamaica. The type is deposited in the Museum of 

 Comparative Zoology. 



Distribution : Known from the above type locality, Kingston Har- 

 bor, Jamaica, and also from the salt water lagoons along the Florida 

 Reefs as far north as Miami. 



Material examined: One specimen dredged in 6 fms., Dry Tor- 

 tugas, Florida, November 26, 1923, field no. 315. 



Color: In life the general color of this jellyfish is greenish gray- 

 blue, the greenish color being due to the presence of clusters of com- 

 mensal plant cells, algae, Zoothanellae, within the gelatinous substance 

 of the disk near the surface. Around the outer edge of the central 

 concavity of the exumbrella is a wide, dull white circle, edged on its 

 inner margin with delicate gray-brown. A somewhat Y-shaped radial 

 white band extends outward from the broad ring in the radii of the 



