﻿April, 1857.] 



ELLIOTT SOCIETY. 



125 



flavidvla of Peron and 0. pusilla of Gosse, are, by the position of 

 their ocelli, separated from Oceania, and belong to the genus 

 Turritopsis, about to be characterized. The Eucopes and Timas 

 of Charleston harbor have lateral cirrhi to the bulbs of their ten- 

 tacula and must be separated from their European representa- 

 tives ; while the number of marginal capsules should also serve as 

 a distinctive character, since within certain limits it is constant 

 for certain groups. 



The Hydroidea of Charleston harbor, arrange themselves un- 

 der the following genera : In the sub-order of Endostomata, we 

 have representatives of the Corynidse, Velellidas, Tubularidas, and 

 Siphonophorae. Among Corynidae, the Oceanidse are repre- 

 sented by the genera Turritopsis and Saphenia; Sarsiadae by two 

 new genera Corynitis and Dipurena, and by Sarsia ; Clavidse 

 have no representative. The Velellid&e by the genus Porpita. 

 Among Tubufcaridae, the Pennaridse, are represented by Zanclea,* 

 Pennaria and Willsia; Tubularidse by Tubularia proper; the 

 Hippocrenidae, by Nemopsis, Hippocrene, Eudendrium, Cory- 

 nedendrium, and Hydractinia. Among Siphonophorae, no repre- 

 sentative of the group of Physophoridae, or Hippopodidae, have 

 been found ; Diphyes, Eudoxia, and perhaps Ersaea, represent 

 the Diphyidae — and the genus Physalia has a representative in a 

 transient visitor of our waters. 



In the second sub-order, the Exostomata — Campanularidae and 

 Sertularidae, are pretty fully represented. It is doubtful whether 

 Thaumantias has a representative. The Eucopidss are represented 

 by Eutima, Eucheilota, Epenthesis, Campanularia, and Laomedea; 

 the Sertularidae, by Dinamena. Plumularia and Aglaophenia; Cir- 

 ceadae, by anew genus Persa allied toCirce; neither Trachynemidse 

 nor Stomobrachidae, have representatives as yet; Geryonidae, are 

 represented byLiriope; Aequoridae are without representatives. 

 Lastly, the Aeginidae are represented by a species which I have 

 referred here to Cunina, but which will, in all probability, fall 



*This approximation of Zanclea to the Pennaridse, I owe to Professor Agassiz, 

 and the delay which, from unavoidable causes, has retarded this publication. — 

 Professor A. informed me this spring that he had observed the development of 

 a genus like Zanclea, from a Pennaria-like Hydroid. I had before, however, sus- 

 pected some relation between Zanclea and Cladonema, and a relation between 

 the latter genus and Pennaria, on account of the characters of Stauridium. — 

 June, 1858. 



