﻿April, 1857.] 



ELLIOTT SOCIETY. 



159 



of tentacula between Tubularidce and Corynidse is also well wor- 

 thy of consideration. In that case the tentacula of Corynidse would 

 correspond to the upper or oral whorl of Tubularidae, which are 

 the latest in development, and the single whorl of Eudendriurr 

 proper would probably correspond to the lower whorl of Tubu- 

 laria, thus representing a condition of the Tubularian hydra still 

 earlier than that represented by Pennaria. But there are other 

 Eudendrium-like larvae, (Hippocrene,) in which the single whorl 

 of tentacula seem, from their contractility, to be allied to the oral 

 tentacula of Tubularia, not to the uncontractile tentacula of the 

 lower whorl. 



The Eudendrium ramosum of Van Beneden is peculiar, in 

 having a funnel-shaped expansion of the horny polypidom to re- 

 ceive each polyp. This reminds us of the fixed Exostomata. 



Remark. — If Cytaeis be a good genus, the compound tentacular 

 bulb will not be a family character. But all the species hitherto 

 referred to this genus, are extremely small, and since I know that 

 Hippocrene sometimes passes through a stage in which it has ail 

 the character of Cytaeis, I, for the present, regard the compound 

 bulb as a family character. (See PI. 10. fig. 10.) 



The Oceania Blumenbachii of Rathke {Mem. Imp. Acad. St. 

 Petersburg, vol. 2nd, 1835, p. 321 and plate,) seems to be one of 

 the Hippocrenidse, possessing not only eight compound tentacu- 

 lar bulbs, like Lizzia, but eight radiate tubes also, while its oral 

 cirrhi are but little developed. 



NEMOPSIS. Agass. (1849.) 



General form rather higher than that of Hippocrene. Oral ten- 

 tacula large and very much branched. Sexual glands not only at- 

 tached to the parietes of the digestive trunk, but also to the radiate 

 tubes, hanging from them free in the concavity of the bell, and 

 following their course towards the circular tube. Tentacular tufts 

 four, as in Hippocrene, but the middle pair of tentacula are cla- 

 vate, and borne aloft like the eyes of a crab. Each of the tentac- 

 ula, the clavate as well as the others, has, at its origin, a small 

 black ocellus, those of the clavate being on the inner and somewhat 

 on the lower side, while those on the filiform tentacula are on the 

 upper side of the base. 



Professor Agassiz, who established this genus, in his " Contri- 

 butions to the Natural History of the AcaJeplise of North Amer- 

 ica" Part I, page 289, remarks that it closely resembles Hippo- 



