NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 133 



As currently known, these species comprise the genus Ilyphagus. It 

 is at once clear that they may be less closely related to one another than 

 indicated. /. coronatus alone is said to have a cephalic cage. /. pluto has 

 a unique circlet of papillae, lacking in all of the others. /. ascendens 

 diverges from the others in having its parapodial ridges on the ventral 

 side of the body. /. bythincola and /. ilyvestis are flat and depressed ; 

 /. ascendens is less depressed, and /. pluto, I. coronatus and /. hirsutus 

 are subcylindrical in shape. In most the cephalic structures are either not 

 known or only incompletely so. All of the species are known only from 

 abyssal depths and limited to the eastern Pacific Ocean, the Arabian Sea 

 and the Antarctic Ocean. 



Family SCALIBREGMIDAE 



Genus SCALIBREGMA Rathke, 1843 



Scalibregma inflatum Rathke, 1843 

 Berkeley and Berkeley, 1952, p. 58, figs. 119-121. 



Fragments come from San Pedro and Long Basins. They are atypical 

 in that the parapodial bases are prolonged and cylindrical, whereas in 

 specimens from shelf and slope depths of southern California they are 

 short. 



The species has a known cosmopolitan distribution, chiefly in shelf 

 and slope bottoms of moderate depths. 



Family OPHELIIDAE 



Genus OPHELIA Savigny, 1818 



Ophelia sp. 



Small, immature or vegetative stages were taken in Santa Catalina, 

 San Nicolas and East Cortes Basins. They measure only a few mm long. 

 They may be representatives of the cosmopolitan O. limacina (Rathke), 

 well known from shallower depths of the northeast Pacific Ocean. 



Genus AMMOTRYPANE Rathke, 1843 



Ammotrypane pallida, new species 

 (Plate 14, fig. 3) 

 The type lot with 2 specimens comes from San Nicolas Basin in 400 

 fms (Sta. 3031). One is ovigerous and has proboscis and nuchal organs 



