WEST COAST HYDKOIDS 25 



but these had gonophores present that are similar to those of 

 Eudendrium capillare as is the trophosome as well. Though the 

 species has not hitherto been reported from this coast, I have no 

 doubt that the specimens belong to the species. 



EUDEXDEIUM KAMEUM (Pallas) 



Tubularia ramea Pallas, Eleneh. Zooph., 1766, p. 83. 



Eudendrium rameum Torrey, Hydroida of the Pacific Coast, 1902, p. 33. 



Eudendrium rameum Torrey, Hydroids of San Diego, 1904, p. 8. 



Distribution. — San Pedro, Cal. (Torrey). 



EUDEXDEIUM EAMOSUM (Linna?iis) 

 Tubularia ratnosa Lixx^rs, Systema Natura?, 1767, p. 1302. 

 Eudendrium ramosum Torrey, Hydroida of the Pacific Coast, 1902, p. 34. 

 Eudendrium ramosum Torrey, Hydroids of San Diego, 1904, p. 8. 



Distribution. — Pacific Grove, San Diego, Cal. (Torrey), 



EUDENDRIUM VAGIXATUM Allman 

 Eudendrium vaginatum Allmax, Ann. and Mag. X. H., 3rd Ser. 11, 1863, 



p. 10. 



Eudendmnn pygmo'um Clark, Alaskan Hydroids, 1876, p. 232. 

 Eudendrium vaginatum Nuttixg, Hydroids of the Harriman Ex.. 1901, 



p. 167. 



Distrihufion. — Akutan Pass, Alaska (Clark) ; Sitka Harbor 

 and Yakutat, Alaska (NuttingV 



HYDRACTIXID.E 

 Genus HYDEACTINIA 



Trophosome. — Hydranths club-shaped, developed from a basal 

 coenosarc. Proboscis conical. 



Gonosome. — Si3orosacs developed on special zooids with few or 

 no tentacles, often provided with thread-cells. 



IITDRACTIXIA AGGREGATA new species 

 PI. II, Figs. 1-4 



Trophosome. — The nutritive zooid of this species appears much 

 stouter near the distal end than Hydractinia polycUna. Part of 

 this stoutness may be due to contraction in the preserved speci- 

 men, but in comparing with preserved specimens of H. polyclina 

 the difference is still evident. As in other species, the number of 

 tentacles increases during development, the number in the adult 

 being 20-24. 



Gonosome. — The generative zooids develop sporosacs while still 

 very young. In the early stages there may be as many as 10 or 



