196 TUBULAEIA. 



Thamnocnidia tubularoides A. Agass. 



This species grows in clusters, which at first sight would readily be 

 mistaken for a sjDecies of true Tubularia, on account of the great diam- 

 eter of the stem, and the large size of the head. The structure of the 

 proboscis, however, shows plainly that it is a genuuie Thamnocnidia, 

 which can at once be distinguished from its Eastern congeners by the 

 stoutness of the stem and size of the head, surrounded by as many as 

 from thirty and even forty tentacles ua large specimens. Found grow- 

 ing profusely on the bottom of the coal-barges which bring coal from 

 Benicia to the Pacific MaU Steamship Company's steamers at San 

 Francisco. 



San Francisco, Cal. (A. Agassiz). 



Cat. No. 11, San Francisco, Cal., December, 1859, A. Agassiz. Hy- 

 dromedusariiun. 



TUBULAEIA Linn. 



Tubularia Lura. (restr. Agass.). Syst. Nat. 1756. 

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



Tubularia larynx Linn. 



Tubularia larynx Ellis. Cor., PI. 16, Fig. 6. 



Tubularia larynx Johnst. Brit. Zooph., p. 50, PI. 3, Fig. 3 ; PI. 5, Figs. 3, 4. 



Tubularia larynx Stimps. Mar. Inv. Grand Manan, p. 9. 1853. 



Grand Manan (W. Stimpson). 



Tubularia Couthouyi Agass. 



Tubularia Couthouyi Agass. Cont. Nat. Hist. U. S., IV. pp. 266, 342, PI. 23% Figs. 8, 9 ; Pis. 



24, 26, Figs. 1-6. 1862. 

 Tubularia indivisa Stimps. Mar. Inv. Grand Manan, p. 9. 1853. 

 Tubularia indivisa Gould. Rep. Inv. Mass., p. 350. 1841. 

 Tubularia indivisa MoRCH ; in Besk. af Gronland, p. 96. 1857. 



Massachusetts Bay (L. Agassiz). 



Cat. No. 4, Boston, August, 1851, H. J. Clark. Hydromedusarium. 

 Cat. No. 5, Grand Manan, 1857, J. E. Mills. Hydromedusarium. 

 Museum Diagram, No. 24, after L. Agassiz. 



