LAOMEDEA. 93 



LAOMEDEA Lajlx. 



Laomedea Lamx. ; in Bull. Soe. Phil. 1812. 

 Laomedea Aga.ss. Coiit. Nat. Hist. U. S., IV. p. 352. 

 Campanularia Lamk. {p- p-)- An. s. Vert., II. p. 129. 



Laomedea rigida a. Agass. 



This species is remarkable for its peculiar mode of growth. At first 

 glance it would readily be mistaken for a species of Dynamena, so 

 regular is the succession of the hydrse along the stem, and also on 

 account of the absence of branches. The sterile and reproductive hy- 

 dras are found on the sides of the main stem, attached by a very short 

 pedicel, and alternate so regularly on each side that its Campanularian 

 nature is noticed only after a careful examination. The sterile hydree 

 resemble those of Laomedea am^yhora, while the reproductive calycles 

 are identical in shape with those of Obelia commissuralis. The main 

 stems of a cluster are closely crowded together, and attaiu a height of 

 three to four inches. 



Cat. No. 122, San Francisco, Cal., December, 1859, A. Agassiz. Hy- 

 dromedusarium. 



Laomedea am.pliora Agass. 



Laomedea amphora Agass. Cont. Nat. Hist. U. S., IV. pp. 311, 314, Fig. 50 ; p. 352, Pis. 30, 31, 

 Figs. 1-8. 1862. 



Massachusetts Bay (Agassiz) ; Grand Manan (Mills) ; Long Island 

 Sound (Leidy, A. Agassiz). 



Cat. No. 91, Nahant, July, 1852, H. J. Clark. Hydromedusarium. 



Cat. No. 92, Nahant, July, 1861, A. Agassiz. Hydromedusarium. 



Cat. No. 93, Nahant, July, 1861, A Agassiz. Hydromedusarium. 



Cat. No. 94, Nahant, March, 1861, H. J. Clark. Hydromedusarium. 



Cat. No. 95, Nahant, April, 1855, H. J. Clark. Hydrarium. 



Cat. No. 96, Nahant, 1857, L. Agassiz. Hydrarium. 



Cat. No. 97, Nahant, March, 1856, H. J. Clark. Hydromedusarium. 



Cat. No. 98, Naushon, Sept. 1861, A. Agassiz. Hydromedusarium. 



Cat. No. 99, Grand Manan, Aug. 1857, J. E. Mills. Hydromedusarium. 



Cat. No. 100, Newport, R. I., S. Powell. Hydromedusarium. 



Cat. No. 101, Newport, R I., Dr. J. Leidy. Hydromedusarium. 



Cat. No. 102, Boston, March, 1856, H. J. Clark. 



Cat. No. 114, Nahant, Sept. 1854, H. J. Clark. Young ? 



Cat. No. 398, Nahant, July, 1862, A. Agassiz. 



Museum Diagram No. 18, after L. Agassiz. 



