258 ;S'. F. Clark — Hydroicts of the Pacific Coast. 



Gonotheciu borne in rows on the upper sides of the branclilets ; the 

 upper j>ortion cylindrical, the proximal half tapering toward the base, 

 aperture terminal, in a small cylindrical process elevated from the 

 center of the distal end. Height of largest specimens, 90""". 



Bay of San Francisco, Cal., — Murray ; Santa Cruz, Cal., — Dr. C. W. 

 Anderson; Santa Barbara, Cal., — Mrs. EUwood Cooper; Vancouver 

 Island, — J. M. Dawson. 



This is an interesting form as it is the only member of the Sertu- 

 laridm on the American coast having the peculiar aperture to the 

 goriothecae, by Agassiz called bottle-shaped, though it is by no means 

 an uncommon form among our CainjKinidar'uloe, — Obelia yelatlnosa, 

 0. genicnlata and 0. dichotoma having the same general form of 

 gonotliecae. 



A peculiar discrepancy occurs in the descriptions of Murray and 

 A. Agassiz in regard to the number of teeth on the rims of the 

 hydrothecae ; the former describes them with three teeth, the centi'al 

 one being larger than the two lateral, while Agassiz describes them 

 with four, two prominent exterior points and two smaller ones near 

 the stem. We have quite a large supply of specimens in a good state 

 of preservation and after having carefully examined them all, I cannot 

 find a single hydrotheca that would afford any reason for changing 

 the above description of tvio teeth upon the rim of each cell. 



I should judge from Murray's figure that his specimens were not 

 well preserved and by contracting had thrown out the inner margin 

 of the rim, giving it, in some views, the appearance of a tooth. But 

 how he made out one tooth to be much larger than the other two, I 

 am at a loss to understand. And the fact of Agassiz having seen 

 four teeth I am at present unable to account for. 



Sertularia furcata Trask. 



Sertularia furcata Trask, Proc. Cal. Acad. Nat. Sci., Mar. 30, 1857, 112, Plate V, 

 figs. 2, a, b, 0, d, e. 



Plate XXXIX, figure 3. 



Stems short, unbranched, rooted by a creeping stolon, simple, spread- 

 ing in every direction forming dense verticillated clusters around the 

 pieces of fucus on which it is usually found, attached to the stolon 

 by a short, slender, twisted process about the length of an internode, 

 divided by transverse joints into short regular internodes each bearing 

 a single pair of hydrothecte, color corneous. Hydrothecije oppo- 

 site, deeply immersed in the stem, with two large, sharp teeth on 



