162 DISCOPHOR^. Part III. 



C. arctica Per. and LeS., Ag., p. 87, Pis. 3, 4, 5, and 5^ — Medusa 

 capillata Fahr. (non Linn.). — Cjanea Postelsii Gould (not Br.). 

 — North-eastern American coast, from the Bay of Fundi/ to Boston 

 harbor (Dr. A. A. Gould and L. Agassiz); Greenland (Fabricius). 

 I have no doubt that the Medusa capillata of Fabricius is 

 identical with the Cyanea arctica of Peron and LeSueur, and 

 that it is the species found along the Atlantic coast of the 

 North American British Provinces and the northern United 

 States, north of Cape Cod. 



Q-. fulva Ag. See p. 119. — Long Lsland Sound (L. Agassiz). 



C. versicolor Ag. See p. 119. — South Carolina (L. Agassiz). 



All the problems which have engaged naturalists, respectr 

 ing the identity of animals in different parts of the world, 

 begin to come up, with reference to these species, as the 

 knowledge of the Medusae advances. At first the North Amer- 

 ican Medusae were considered as identical with those of Eu- 

 rope, but a closer comparison shows them to be different. 



C. ferruginea Esch. — Kamtschatka, Aleutian Lslands, and north-vjest 

 coast of North America (Eschscholtz). 



C. Postelsii Br., Ac. St. Petersb., 1838, Pis. 12, 13, and 13\ — Cya- 

 neopsis behringiana Br., PI. 11, fig. 1, is only a young of this 

 or the preceding species. — North Pacific, Norfolk Sound, and 

 between Sitka and JJnalaschka (Mertens) ; Port Townsend (A. 

 Agassiz). It remains to be ascertained whether there are 

 real specific differences between the Cyaneae found on the 

 Asiatic and on the American sides of the Pacific. Brandt 

 maintains that Cyanea Postelsii differs from C. ferruginea, but 

 he assigns to both the same range of distribution, which is 

 not probable. 



Lesson's Cyanea plocamia, Voy. Coquille, PI. 12, from the 

 coast of Peru, and Kaynaud's Cyanea caliparea, in Lesson's 

 Cent. Zool., PI. 20, from Pondicherry, may both belong to the 

 following genus, Stenoptycha. 

 Stenoptycha Agass. The narrow band of concentric folds alternating 

 with radiating folds, readily distinguishes this genus from 

 Cyanea. The tentacles, also, are fewer in number and 

 arranged in a single row. 



St. rosea Ag. — Cyanea rosea Q. and G., Zool. Uranie, PI. 85, figs. 1 

 and 2. — Netv South Wales, Port Jackson (Quoy and Gaimard). 



