NO. 2 HARTMAN, BARNARD: BENTHIC FAUNA OF DEEP BASINS 159 



Another species is Sosanopsis armipotens Moore (1923, pp. 215-216, 

 pi. 18, figs. 26-29) from off Santa Catalina Island in 2228 fms, red mud. 

 This is much smaller, measures only 31 mm long by 1.3 mm wide. The 

 thorax has 16 setigerous, and the abdomen more numerous, segments. 

 The unpaired oral tentacle is very large, and the lateral ones are much 

 slenderer and shorter. Branchiae number 4 pairs, are filiform and ar- 

 ranged as in species of Melinna (see above) ; 3 are posterior and one 

 pair is anterior. Nuchal spines are absent. Setal fascicles of the first 3 

 segments are in short, vertical, curved series; their stems are deeply 

 buried, their blades short, delicate, tapered to acute tips. More posterior 

 fascicles have longer and shorter setae. Thoracic uncini have 2 rows of 

 3-4 teeth each. Abdominal uncini have broad crowns and teeth are in 

 more numerous rows of many each. 



One more species may be mentioned; this was recorded as Melinna 

 pacifica Moore (1923, p. 213); it is here referred to a new name 

 (below). 



Melinnexis moorei, new name 



Melinna pacifica Moore, 1923, pp. 213-214. Not Mcintosh, 1885, p. 440. 



Two individuals from Patton escarpment (Sta. 5937) are believed 

 the same as those named Melinna pacifica by Moore (1923). Nuchal 

 spines are lacking. The 4 pairs of branchiae are cirriform and taper dis- 

 tally; those on each side form a close cluster, having a common stalk. 

 The nuchal membrane is weakly crenulated. 



Three larger ones, in long tubes, come from San Pedro Basin (Sta. 

 2895) ; the longest measures 250 mm long and contains a specimen 80 

 mm long. The species may have a distribution in deep and abyssal depths 

 of southern California. 



Genus SCHISTOCOMUS Chamberlin, 1919 



Schistocomus hiltoni Chamberlin, 1919 

 Chamberlin, 1919a, p. 17. 



A single collection is from San Pedro Basin; other larger, more 

 mature specimens have been taken in shallower bottoms of southern 

 California. Another, nearly related one is Schistocomus sovjeticus Annen- 

 kova (1937, p. 187) named from the northern part of the Japan Sea. 



