74 C. McLEAN FRASER 



tion of the pedicel which supports the ''pinna", scarcely corre- 

 sponds. He says "This (the pedicel) is attached to the rachis 

 by a strong base, is sub-pyriform and cylindrical, is free for 

 about three-fourths of its length, terminating in a rather bluntly 

 rounded, rostrate process on the outer and superior aspect". In 

 his drawings he shows this "rostrate process", but I can see no 

 indication of it in the specimens examined. These show the ped- 

 icel to be " a short, slender, twisted process, about the length of an 

 internode", as Clark describes. Trask's other drawings though 

 somewhat indistinct, bear out several of the points mentioned. 



SERTULARIA GRACILIS Hincks 



Sertularia pumila var. Johnston, British Zoophytes, 1848, p. 469. 

 Sertvlaria gracilis Hincks, British Hyclroid Zoophytes, 1868, p. 262. 

 Sertularia gracilis Nutting, American Hydroids, Part II, 1904, p. 57. 



Prof. Nutting gives this species in the table of Geographical 

 distribution on p. 46, but does not mention any such distribution 

 in his description of the species on p. 57. 



SERTULARIA PUMILA Linnaeus 



Serularia pumila Linn^us, Systenia Naturfe, 1758, p. 807. 



Sertularia pumila Clark, Hydroids of the Pacific Coast, 1876, p. 251. 



Sertularia pumila Nutting, American Hydroids, Part II, 1904, p. 51. 



Distrihution. — Coast of California (Clark). 



SYNTHECIUM CYLINDRICUM (Bale) 



Sertiilarella cylindricum, Bale, Proe. Linn, Soc, N. S. "W., 2nd Ser., Ill, 

 1888, p. 765. 



Sertiilarella halecina Torrky, Hydroida of the Pacific Coast, 1902, p. 61. 

 Synthecium cylindrica Nutting, American Hydroids, Part II, 1904, p. 136. 



Distribution. — San Diego Bay, Cal., 5-12 fathoms (Torrey). 

 Keference is made to this species in the general discussion of 

 the SertularidcB. 



Genus THUIARIA 



THUIARIA ALBA new species 



PI. VII, Figs. 1-2 



Trophosome. — The colony reaches a height of about two 

 inches. The main stem is coarse, rigid and but slightly flexuose, 

 provided with several annulations near the base, nodes irregular 

 but quite distinct. The branching is regular, alternate and pin- 

 nate, with commonly three hydrothecse between two successive 



