456 THE ANNELIDA POLYCHAETA. 



tudinal furrow. A deep transverse sulcus across proximal portion. At its 

 anterior end protrudes a lobe presenting two rounded processes, one a little 

 each side of the median line. 



The peristomium forms ventrally a conspicuous lower lip, which is propor- 

 tionately broad. The lip presents anteriorly a wider median and, on each side, 

 a short convex margin, and the border flares ventrad. The tentacles are short, 

 in the preserved specimen somewhat enlarged distally and wholly smooth. 

 They are few in number. 



The branchiae are relatively thick at base, terete, and conspicuously sub- 

 ulate distad. In length they exceed twice the width of the body and equal 

 nearly half the length. 



The anterior setigerous somites, especially the first three or fovu", are pro- 

 portionately very short. The somites of the caudal division are actually and 

 proportionately longer, excepting the last ones. The setigerous notopodia are 

 cylindrical. The non-setigerous notopodia of the caudal region are thi-oughout 

 well developed and of similar form, but less stout. The pinnulae expand above 

 base, extending freely out into ectal and mesal angles distally, subtruncate, 

 roughly inversely subtriangular in outline. 



The capillary setae in type are somewhat longest over middle thoracic 

 region, where they measure about 1.1 mm. Slenderly acuminate, as usual, the 

 tips very slender, curved, but not at all uncinate or curled. The uncini present 

 four fully developed teeth above the inferior process, as in Grubiella antardica 

 Mcintosh, but with the abdental angle much less produced and the teeth of 

 different form and proportions. (Plate 77, fig. 13). 



Locality. Gulf of Cahfornia: Sta. 3435 (lat. 26° 48' N., long. 110° 45' 

 20" W.). Depth 859 fms. Bottom temp. 37.3° F. 22 April, 1891. One 

 specimen. 



This species is readily distinguishable from S. anops and S. auricula (Malm- 

 gren), recorded from Puget Sound and Japan respectively, in the form of the 

 uncini and the number of their teeth, there being but four on each in place of 

 six in anops and five in auricula. The branchiae are proportionately consider- 

 ably longer than in anops, in which, in turn, they are longer than in auricula. 



Pabits, gen. nov.^ 



Total number of somites uncertain. Fifteen somites bearing capillary 

 setae. Uncini beginning on the fourth setigerous somite. 



' Gosiute pa, water, aquatic, and bitsi, bits, living thing, animal. 



