Chap. IX. 



TABULAR VIEW. 



361 



Z. cjanea A(/} — Florida: Key West (Agassiz). 



Z. vitrina A(/. — ^quorea vitrina Gosse, Devon., PI. 23. — Devon- 

 shire (Gosse). 

 Rhegmatodes A. Ag? 



R. tenuis A. Ag? — Buzsard's Bay: Naushon (A. Agassiz). 



R. floridanus Ag} — Florida: Key West (Agassiz). 



R. Forbesianus Ag. — ^quorea Forbesiana Gosse, Devon., PI. 24. — 

 Devonshire (Gosse). 



R. globosa Ag. — .^quorea globosa Esck, PI. 10, fig. 2. — Pacific 

 Ocean, near the Equator (Eschscholtz). 



Stomobrachium mirabile Kdll. — Messina (Kolliker), belongs to this 



genus. 



Stomobrachium Br!' (non Forbes). 



St. lenticulare Br., PI. 3, fig. 7. — Falkland Islands (Mertens). 

 St. tentaculatum Ag.'^ — 3fassachuseits Bay, JVahant (Agassiz). 



' Zygodaetyla cyanea Aff. Spherosome of a light 

 blue color ; this species can at once be distinguished 

 from the Z. groenlandica by the greater thickness of 

 the spherosome, the shorter digestive cavity, with a 

 large actinostome surrounded by innumerable small 

 fimbriated lips, and the greater radius of the digestive 

 cavity, which is more than half that of the sphero- 

 some itself. Actinal diameter three inches, polar 

 diameter two inches. — Key West, Florida (Agassiz). 



^ Rhegmatodes ^. J^f. Spherosome flat ; chymife- 

 rous tubes numerous ; digestive cavity short, of small 

 diameter compared to that of the spherosome ; lips 

 of actinostome scarcely fimbriated. Large tentacles, 

 twice as numerous as the chymiferous tubes, and 

 not always placed opposite them ; rudimentary ten- 

 tacles between the larger ones. 



' Rhegmatodes tenuis A. Ag. Specimens measur- 

 ing between three and four inches have been found 

 at Naushon. Ratio of actinal to polar diameter as 

 one to three and a half; in young specimens as 

 one to one and a half; in large specimens there 

 were thirty chymiferous tubes, extending along the 

 bulging of the disk into the cavity of the bell. 

 Digestive cavity very short, lips of actinostome re- 

 sembling a piece of catgut tied near the end. The 

 ovaries do not extend to the circular tube, but hang 

 VOL. IV. ■ 46 



down in two pouches from the chymiferous tubes. 

 Spur placed opposite the base of the large tentacles. 

 Two marginal capsules for each large tentacle, two 

 granules in each marginal capsule, placed opposite 

 one another, near the circumference. Disk color- 

 less. — Naushon, Buzzard's Bay (A. Agassiz). 



* Rhegmatodes floridanus Ag. resembles the young 

 of Rhegmatodes tenuis at the time when it has from 

 sixteen to twenty-four chymiferous tubes. This 

 species has three large tentacles between every two 

 chymiferous tubes, and one opposite each. Ovaries 

 extending only along the middle portion of the 

 chyniiferous tubes ; from three to five marginal cap- 

 sules between the large tentacles, with two, or even 

 three granules in each. 



^ This genus differs chiefly from the other 

 iEquoridiE, by the structure of its actinostome, 

 which is distinctly divided into four lobes. 



^ Stomobrachium tentaculatum Ag. Tlie tenta- 

 cles between every two chymiferous tubes are from 

 thirty to forty in number. The ovaries extend 

 along the greater part of the chymiferous tubes, 

 except a small portion of the actinal and abactinal 

 ends. The lobes of the actinostome are only four 

 in number. The disk is colorless. — Massachusetts 

 Bay, Nahant (Agassiz). 



