SEETULARIAD^. 



141 



Family SERTULARIADJE Johnst. 



Sertulariadm Johnst. British Zoophytes, p. 5 7. 



DYNAMENA Lamx. {restr. Agass.). 



Dynamena Lamx. ; in Bull. Soc. Phil. 1812. 



Dynamena Agass. Cent. Nat. Hist. U. S., IV. p. 355. 1862. 



Dynamena pumila Lamx. 



Dynamena pumila Lamx. .Cor. Flex., p. 179. 



Dynamena pumila Johnst. Brit. Zooph., p. 66. 



Dynamena pumila Agass. Cont. Nat. Hist. U. S., IV. pp. 32G, 355, PI. 32. 1862. 



Dynamena pumila Pack.; in Can. Nat. & Geol., Dec. 1863. 



Sertularia pumila Morch ; in Beskriv. af Greenland, p. 97. 1857. 



Sertularia thuja Fab. (teste Morch). Fauna Groenl., No. 456. 



This is one of the few of our Hydroids (Fig. 225) which have been 

 compared in a hving state with European specimens sent by Mr. Thos. 

 J. Moore to the Museum, and brought across the Atlantic by Captain 

 Anderson. Professor Agassiz, supposing it to be a distinct species, had 

 previously given it the name of Dynamena Fdbricii ; and before he 



had examined the development of the sessile Medusa (Fig. 226), sup- 

 posed it to be the Hydroid of our Melicertum camjmnula See, for the 

 Hydroid of Melicertum, the description of that species. 



European and American shores of Atlantic Ocean (Ellis, Agassiz). 



Cat. No. 163, New Brighton, England, 1860, H. J. Clark. Hydrarium. 



Cat. No. 164, Liverpool, October, 1861, Thos. J. Moore. Hydromed. 



Cat. No. 165, Lynn, Mass., May, 1852, H. J. Clark. Hydromedusarium. 



Cat. No. 166, Nahant, July, 1862, A. Agassiz. Hydromedusarium. 



Cat. No. 167, Nahant, May, 1862, A. Agassiz. Hydromedusarium. 



Cat. No. 168, Nahant, July, 1861, A. Agassiz. Hydromedusarium. 



Fig. 225. Cluster of Dynamena pumila. 



Fig. 226. Magnified portion of stem of Fig. 225. 



