ENDEMISM IN THE NORTH PACIFIC 45 



the outer edge (fig. 4). Seen from the cutting edge, the spinelets are in 

 dispersed arrangement (fig. 5). 



The proboscis, everted in some individuals, is a soft, lobed pouch 

 extending from a short cylindrical base and terminating distally in about 

 12 digitate, subequal lobes; it resembles that of some orbiniids. The body 

 ends in a few, poorly marked segments and an anal ring provided vi^ith 

 three long filaments, one pair lateral and the other midventral (fig. 2). 



Distribution: This is widely dispersed in soft bottoms of San Pedro 

 Basin, California, in 6 to 440 fms, with the greatest concentrations in 

 Outer Los Angeles Harbor. Other collections come from San Francisco 

 Bay, California (reported as Cossura, nr. longicirrata [sic] Hartman, 

 1954, p. 11 ) and from low intertidal areas along the western shores of 

 Lower California, Mexico. 



OWENIIDAE 



Owenia delle Chiaje, 1841 



It is generally agreed that Owenia fusiformis delle Chiaje has a 

 geographic range that extends from Arctic Ocean (as Ammochares 

 assiniilis Sars, 1851) through tropical (as Ammochares brasiliensis 

 Hansen, 1882, from Brazil) into south temperate seas (as Ammochares 

 tegula Kinberg, 1867, from Argentina, and A. tenuis Haswell, 1883, 

 from Port Jackson, Australia) and from the Philippine Islands ( as Am- 

 mochares orientalis Grube, 1878). It is further known from the western 

 side of the northern Atlantic Ocean (as Ammochares artifex Verrill, 

 1885, from New England, and as A. aedificator Andrews, 1891, from 

 North Carolina) and from the northern Pacific Ocean (as Ammochares 

 occidentalis Johnson, 1901, from Washington). As O. fusiformis it is 

 recorded from Japan (Okuda, 1937). Its known bathymetric range ex- 

 tends from shallow littoral (Watson, 1901, p. 237) to abyssal, in 2975 

 fms (Mcintosh, 1885, p. 410). 



Watson (1901, pp. 230-260) and Caullery (1944, pp. 49-52) have 

 given essential details of morphology and anatomy and there are long 

 published accounts on synonymies. 



Many individuals of Owenia have been taken in San Pedro Basin, 

 California. As they consistently differ from O. fusiformis in characters 

 which are believed to be more than varietal, they are here described as 

 a new subspecies. 



