Chap. IX. 



TABULAR VIEW. 



353 



Oceania folleata Af/. — Epenthesis folleata JIc Cr. — Charleston, South 

 Carolina (McCradj). 



O. languida^ A. Ag. — Nahant and Naiishon (A. Agassiz). 



O. gregaria^ A. Ar/. — Gulf of Georgia, W. T. (A. Agassiz). 



Phialidium viridiscens LencJc, Arch. Nat., 1856, from Nice, belongs 

 to this genus. 



Thaumantias convexa Forbes, PI. 11, fig. 6, Zetland, may also be 

 a distinct species. — T. Thompsoni Forhes, PI. 11, fig. 5, seems 

 to be the adult of Obelia sphoerulina. See p. 351. 



Thaumantias gibbosa Forbes, Nak. Med., PI. 11, fig. 3, Hebrides, 

 constitutes, probably, a distinct genus. 

 Eucheilota McCr. 



E. ventricularis McCr., PI. 11, figs. 1-3, and PI. 1, fig. 12. — Charles- 

 ton (McCrady) ; Naiishon (A. Agassiz). 



E. duodecimalis ^1. Ay? — Naiishon, Bttssard's Bay (A. Agassiz). 



tached to the base of the tentacles, while in the 

 OceanidiB they are free, and occupy, along the 

 cil'cular tube, a position which seems independent 

 of the arrangement of the tentacles. As I now 

 know the young Medusa of four genera of this 

 family, I am able to add to llic family cliaracter 

 that, in their early stages of growth, these Medusa; 

 have only four tentacles, one in the prolongation 

 of each of the four radiating tubes, and two eyes 

 in each interval ; while the Eucopidoe are hatched 

 with at least sixteen or twenty-four tentacles, with 

 eyes attached to two of the tentacles in each quarter 

 segment. The Laodiceidm are born with two or 

 four tentacles only, placed, like those of the Ocean- 

 idu;, in the prolongation of the radiating tubes, but 

 tiiey have no eyes at all. As many of these 

 Medusaj have a large number of tentacles in their 

 adult condition, it follows that the specific dis- 

 tinctions which have been based upon the relative 

 number of tentacles are not trustworthy ; and yet 

 the reduction of the species hinted at above, should 

 merely be looked upon as approximative, since I 

 had no means of tracing the transformations of the 

 European species, and could only infer their spe- 

 cific identity from what I have observed in the 

 American species. 



VOL. IV. 45 



' Oceania languida A. Ag. Spherosome a seg- 

 ment of a sphere, somewhat less than a hemi- 

 sphere. Tentacles thirty-two in number, with large 

 swelling at the base. Two or three sensitive cap- 

 sules, with one granule in each, between every two 

 tentacles ; digestive cavity with short lips ; ovaries 

 linear, light brown, extending from the circular 

 tube nearly to the base of the digestive cavity. 

 One inch in diameter, half an inch high. — Naliant 

 and Naushon (A. Agassiz). 



^ Oceania gregaria A. Ag. Four pale-yellow, 

 linear ovaries, extending from the circular tube 

 along one half the length of the chymiferous tubes. 

 Thirty-six short tentacles, not capable of great ex- 

 pansion. Lips of actinostome very thin, convoluted. 

 Three quarters of an incli in diameter. — Gulf of 

 Georgia, from May to September (A. Agassiz). 



' Eucheilota duodecimalis A. Ag. Spherosome 

 thin, of uniform thickness ; ovaries short, elliptical, 

 commencing from the circular tube ; four tentacles, 

 with lateral cirrhi, one opposite each chymiferous 

 tube. Twelve sensitive capsules, one in the middle 

 of the space between two tubes, and one on each 

 side of the four tentacles. Digestive cavity short, 

 bottle-shaped, colorless ; one quarter of an inch in 

 diameter. — Naushon, September (A. Agassiz). 



