26 University of California Publications. [zoology. 



Systematic Discussion. 



GYMNOBLASTEA. 



Hydroida without true hydrothecae or gonothecae. Gonophores when 

 free, usually furnished with eye-spots, gonads on wall of manubrium. 



Fam. BOUGAINVILLIIDAE. 

 AtractyUdce, Hincks, Brit. Hydr. Zooph., 1868, p. 87. 

 Trophosome. Hydranth with a single verticil of filiform tentacles around 

 the base of a conical or dome-shaped proboscis. 



Gonosome. Gonophores in the form of fixed sporosacs or free medusse. 



There is, it appears to me, as little advantage in separating 

 this family into two (Bimeriidm, Bougainvilliida ) on the basis of 

 the free or fixed character of the gonophores, as there is in 

 dividing the Corynidce into two families oil the same grounds. 

 I have ventured, therefore, to restore the family Atracfylidce, as 

 Hincks understood it, changing the name, however, for reasons 

 which Allman has fully set forth ('71, p. 299). The oldest 

 genus in the family thus constituted is Bougainvillia , for which 

 reason I have given its name to the family. 



Bimeria. Wright. 



Bimeria. T. S. Wright, Edin. N. Phil. Jour., 1859, n. s., X., p. 109. 

 Hincks, Brit. Hydr. Zooph., 1868, p. 103. Allman, Gymnobl. 

 Hydr., 1871, p. 297. 

 Garveia. T. S. Wright, Edin. N. P. Jour. 1859, p. 109. Hincks, 

 Brit. Hydr. Zooph., 1868, p. 101. Allman, Gymnobl. Hydr., 

 1871, p. 294. Nutting, Proc. Wash. Ac. So., 1901, III., p. 166. 

 Trophosome. Colony branching, hydranth fusiform with conical probos- 

 cis, and invested with perisarc which may cover the tentacles and proboscis 

 proximally. 



Gonosome. Gonophores sporosacs, never borne on body of hydranth. 



The original diagnosis of Bimeria was based upon specimens 

 of B. vestita Wright, which up to the present time has been the 

 only species definitely referred to the genus, with the exception 

 of a species from San Diego, Cal., described by Clark ('76), 

 under the provisional name of Bimeria (?) gracilis. 



The character which distinguishes the trophosome of Bimeria 

 from that of Garveia in the diagnosis of Hincks ('68) and All- 



