196 TUBULARIA. 



Thamnocnidia tubularoides A. AGASS. 



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

 mistaken for a species 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 genuine 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 in large specimens. Found grow- 

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

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

 Francisco. 



San Francisco, Cal. (A. Agassiz). 



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

 dromedusarium. 



TUBULARIA LINN. 



Tubularia LINN, (restr. Agass.). Syst. Nat. 1756. 

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



Tubularia larynx LINN. 



Tubularia larynx ELLIS. Cor., PL 16, Fig. 6. 



Tubularia larynx JOIINST. 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 Couthouyl 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. 



