78 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



posteroventral side of the body, is surrounded by a ring of glandular, 

 columnar ridges (Plate 2, fig. 3) ; these are presumed to be absent in 

 Promctor benthophila. 



A pair of large, brassy-yellow spines emerge from the anterior ventral 

 side of the body; a third spine, somewhat smaller, is present on the right 

 side (Plate 2, fig. 2). These spines have a crooked end which broadens 

 out distally into a spatula (Plate 2, fig. 4). A large median pore is 

 immediately behind the setal bases; posterior to this is the pair of anterior 

 nephridia, which can be seen through the body wall and which, when dis- 

 sected out, are seen as oval sacs containing small spherical ova (Plate 2, 

 fig. 2). 



Prometor poculum differs from P. benthophila in having a body that is 

 oval, not pear-shaped. The setae are distally spatulate, not tapering. The 

 paired nephridia are short oval, not long. The anal pore is surrounded 

 by columnar gland cells. 



Tatjaniella Zenkevitch (1957, p. 292) may be a related genus, as 

 this author has already noted. It was erected for two species originating 

 in the northwest Pacific Ocean, between Kamchatka and Sakhalin, in 

 great depths (4820 meters). They similarly have a cup-shaped organ at 

 the base of the proboscis, but they differ in their details, as described by 

 Professor L. A. Zenkevitch. 



POLYCHAETA 



Family APHRODITIDAE 



Genus LAETMONICE Kinberg, 1855 

 Laetmonice sp. 



A small specimen from Patton escarpment (see App. 1 of this paper 

 for locality data) measures 9.5 mm long and 7.5 mm wide. It differs 

 from L. pellucida Moore and L. producta wyvillei Mcintosh, both re- 

 corded from deep water off southern California (Moore, 1910, p. 386), 

 in that the neuropodial setae have a lateral spur much larger than is 

 typical of either species and the fringe beyond the spur is fine and short 

 instead of long and coarse. 



Species of this genus are usually abyssal and cosmopolitan in occur- 

 rence. 



