16 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 4 



Family Atractylidae 



Genus BIMERIA 



Bimeria gracilis Clark 



Bimeria gracilis Clark^ Hyd. of Pacific Coast, 1876, p. 252. 



Fraser^ Hyd. of Vancouver Island, 1914, p. 115. 



Distribution. — James Bay, 50-70 fathoms; Bahia Honda, low tide; 

 South Viradores Islands, 8-10 fathoms; north of White Friars Islands, 

 5-10 fathoms; Isabel Island, 10-35 fathoms. 



PBimeria laxa, new species 

 Plate 2, Fig. 9 



Trophosome. — Colonies, reaching a height of 6 cm., are fascicled 

 in an unusual manner; there is one central tube much larger than the 

 peripheral tubes that cover it loosely, so that much of it is exposed; 

 this applies not only to the main stem but to the main branches, that are 

 few in number and irregularly arranged. Short, slender branches or 

 branchlets are given oiif irregularly from the main stem as well as from 

 the branches, at an acute angle ; the pedicels are short and wrinkled but 

 not distinctly annulated. The portion of the perisarc that surrounds 

 the base of the hydranth is rugose; hydranth small, with 9-10 tentacles. 



Gonosome. — Not observed. 



Distribution. — Academy Bay, 17-22 fathoms. 



PBimeria pygmaea, new species 

 Plate 2, Fig. 10 



Trophosome. — Minute, solitary zooids, 0.4 mm. high, grow at quite 

 regular intervals from a linear stolon, which has scarcely any branches. 

 The perisarc on the pedicel, as well as that which grows over the base 

 of the hydranth, is wrinkled. Tentacles 10-12. 



Gonosome. — Not observed. 



Distribution. — Santa Elena Bay, 8-12 fathoms. 



Bimeria tenella Fraser 



Bimeria tenella Fraser^ California hydroids, 1925, p. 168. 

 Distribution. — In outer Cartago Bay, 32 fathoms. 



