LAOMEDEA. 93 



LAOMEDEA LAMX. 



Laomedea LAMX.; in Bull. Soc. Phil. 1812. 



Laomedea AGASS. Cont. Nat. Hist. U. S., IV. p. 352. 1862. 



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 hydroe 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 hydrne 

 resemble those of Laomedea amphora, while the reproductive calycles 

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

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

 three to four inches. 



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

 d rome dusarium. 



Laomedea amphora 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. 



