Vol. l.] Torrey . — Hydroida of the Pacific Coast. 33 



Gonosome. Perisarc annulated regularly in narrow annula? on stem and 

 branches, extending as a thin expansion upon the bodies of the hydranths 

 to the bases of the tentacles. Very dark brown, may be almost black. 

 Female gonophores monothalamic, crowded on the body of the hydranth 

 immediately proximal to the tentacles; each gonophore usually with one 

 ovum to which its orange color is due. Male gonophores dithalamie, in two 

 or three whorls just proximal to tentacles; a delicate pink with small green 

 spadix. Gonophores of both sexes invested with perisarc. 



Distribution . Entrance of San Francisco Bay; Tomales Bay, 

 Cal.; Pacific Grove, Cal., between tides. 



This species resembles E. vaginatum closely, but differs in the 

 distinctly narrower annulation of the perisarc, and the habit, 

 which is much fiver and more graceful, though the branches are 

 quite rigid. The annulation agrees perfectly with that figured 

 by Clark ('76) for a hydroid from Santa Cruz; this, with his 

 description and the fact that E. californicum occurs both north 

 and south of Santa Cruz, removes any doubt in my mind that his 

 species is identical with the latter, rather than with E. vaginatum . 

 It is probable that E. pygmceum Clark ('76) is a synonym of E. 

 vaginatum, as Nutting suggests. 



Colonies with female gonophores were collected during Novem- 

 ber, December, January; male gonophores were seen in January, 

 1902. 



It is clear from Fig. 14 that the gonophores are borne on 

 young but fully formed hydranths which may not lose their 

 tentacles as the gonophores develop. Often the gonophores 

 become so numerous as to crowd the tentacles, which are then 

 usually more or less concealed; but in no case that I have examined 

 are they wanting. 



Eudendrium rameum Pallas. 



Tubularia rumen, Pallas, Elenchus Zoophytorum, p. 83. 

 Eudenrium rameum, Johnston, Brit. Zooph., 1847, p. 45. 



Distribution. San Pedro, Cal. Mediterranean, Norway, Great 

 Britain (Allman). Jan Mayen (Marktanner-Turneretscher). 



The hydroid which I have referred to this species, hitherto 

 unrecorded for the Pacific Coast, reaches a length of 11 cm. 

 The stem is polysiphonic, the perisarc heavy and brown. Branches 

 appear irregularly but tend to lie in one plane, more or less 

 alternate. Secondary branches approximately alternate, in planes 



ZOOL.— 3 



