iS. F. Clark — Hydro ids of the Pacific Coast. 259 



the outer margin and a large aperture generally reaching to the 

 stem. Gonotlieca3 large, sessile, generally borne near the base of the 

 steins though occasionally found scattered over the entire length, of 

 an elongated oval form, sometimes slightly compressed, with a large 

 circular, terminal aperture. Height of largest s|)ecimen, 45""". 



Bay of San Francisco and Farallone Islands, — Trask ; Santa Cruz, 

 Cal., Bay of ^lonterey, — C. W. Anderson ; San Diego, Cal., — Dr. E. 

 Palmer ; Santa Barbara, Cal., — Mrs. Ellwood Cooper ; Santa Barbara, 

 Cal.,— Dr. L. X. Dimmick. 



S. furcata seems to be more nearly allied to aS', Greenei than to 

 any other Sertularian of the west coast known to us, both having 

 the same style of hydrothecte, arranged in about the same manner 

 and with similarly toothed apertures. It is the same style seen in S. 

 operculata of Linnteus. 



-iS'. furcata may be readily <listinguished from S. (xreenei by its 

 entirely different gonothecfe, by the different size of the aperture in 

 the hydrothccae, by the extent to which the hitler are immei-sed in 

 the stem and by the habit or mode of growth. In general appearance 

 it strongly reminds one of the Sertalaria puudla of the New England 

 coast. 



Sertularella turgida <'iaiis (Trask). 



Sarlularia turgida Trask, Proc. Cal. Acad. Nat. Sei.. Mar. 30, 1857, 11."., Plate IV, 

 fig. 1. 



Sertularia turgida A. Agassiz, Cat. N. Am. Acalepha3, p. 145, 1865. 

 Plate XXXVIII, figures 4, 5. 



Stems attached by a creeping stolon, sparingly branched, attached 

 to the stolon by a pedicel consisting of three or four rings, short, 

 stout, simple, spreading in every direction from the branches of fucus 

 and pieces of laminaria which seem to be the favorite stations of this 

 species, divided by oblique joints into shori, stout internodes each 

 bearing a single hydrotheca, color light corneous ; branches stout, 

 erect, usually about half the length of the main stem and very irregu- 

 larlv arranged, in some cases alternately, in others all the branches 

 spring from one side of the stem and sometimes there seems to be 

 no regular arrangement. Hydrotheca? large, full, alternate, deeply 

 immersed in the stem, the inner angle of the proximal end extending 

 more deeply into the stem than the outer, aperture large, armed with 

 three stout teeth, two of which are larger than the other and are 

 situated on the outer side of the rim, facing the stem, the third tooth 



