THAMNOCNIDIA. 195 



Parjrpha crocea Agass. 



Parypha crocea Agass. Cont. Nat. Hist. U. S., IV. pp. 249, 342, Pis. 23, 23% Figs. 1 - 7. 1862. 



Boston Bay (L. Agassiz). 



Cat. No. 13, Warren Bridge, Boston, June, 1858, H. J. Clark. Hy- 

 dromedusarium. 



Parypha microcephala A. Agass. 



Resembles in its general aspect the Parypha cristata Agass.; the 

 stem is more slender than that of F. crocea, found in Boston Harbor ; 

 the head is much smaller than in either of the above-mentioned spe- 

 cies, though the stem grows to a size fully as great as in our Eastern 

 Parypha, giving it a very characteristic aspect. Found attached to 

 floating logs round the wharves of San Francisco. 



San Francisco, Cal. (A. Agassiz). 



Cat. No. 15, San Francisco, Cal., October, 1859, A. Agassiz. Hydro- 

 medusarium. 



Cat. No. 17, San Francisco, Cal, December, 1859, A. Agassiz. Hydro- 

 medusarium. 



THAMNOCNIDIA Agass. 



Thamnocnidla Agass. Cont. Nat. Hist. U. S., IV p. 342. 1862. 



Thamnocnidia spectabilis Agass. 



Thamnocnidia spectabilis Agass. Cont. Nat. Hist. U. S., IV. pp. 271, 342, PI. 22, Figs. I - 20. 1862. 



Massachusetts Bay, Boston (L. Agassiz). 



Cat. No. 6, Boston, August, 1851, H. J. Clark. Hydromedusarium. 



Thamnocnidia tenella Agass. 



Thamnocnidia tenella Agass. Cont. Nat. Hist. U. S., IV. pp. 275, 342, PI. 22, Figs. 21 - 30. 1862. 



Massachusetts Bay, Nahant (L. Agassiz). 



Cat. No. 7, Nahant, Mass., September, 1854, H. J. Clark. Hydrome- 

 dusarium. 



Cat. No. 8, Nahant, July, 1861, A. Agassiz. Hydromedusarium. 

 Cat. No. 410, Eastport, Me., 1861, Anticosti Expedition. 

 Cat. No. 411, Eastport, Me., 1863, A. E. Verrill. 

 Cat. No. 412, Eastport, Me., 1863, A. E. Verrill. 



