438 ALLAN HANCOCK. PACIFIC EXPEDITIONS VOL. 10 



they are stationary, papillae. Nephridial apertures are visible on pos- 

 terior thoracic segments; they have not been located on abdominal seg- 

 ments. The proboscis has coarse papillae on its proximal half and is 

 smooth distally. Abdominal hooks are hooded; the beak has a major 

 fang with a crest of 3 teeth. 



Leiocapitclla may be considered intermediate between Leiochrus 

 Ehlers and Pseudocapitella Fauvel, hence the generic name (see chart). 

 In Leiochrus the first setigerous segment is complete with notopodia and 

 neuropodia but the fourteenth segment has both setae and hooks in both 

 rami of parapodia. In Pseudocapitella a neuropodium is lacking on the 

 first setigerous segment but pointed setae are continued posteriorly in 

 notopodia through 17 segments. All 3 genera are believed to be 

 abranchiate. 



Leiocapitella glabra, new species 

 Plate 54, Figs. 1-3 



Collections.— WO)! -A() (1); 1265-41 (1). 



The general shape of the body is linear and cylindrical except that the 

 anterior thoracic region is somewhat enlarged. One anterior fragment 

 (1265-41) with thorax and 16 abdominal segments measures 20 mm; 

 another (1107-40) with thorax and 36 abdominal segments measures 

 51 mm long but it is somewhat macerated. The thoracic epithelium is 

 smooth except for fine striations and wrinkles of contraction but there is 

 no areolation. 



The prostomium is small, nearly hemispherical ; it is rounded at its 

 anterior end and lacks a palpode. A few small, indistinct and deeply 

 embedded specks on either side and in front of the nuchal slits may repre- 

 sent ocular areas. The nuchal slits have the usual position at the pos- 

 terior margin of the prostomium. The peristomium or first segment is 

 apodous and about 1^^ times as long as the next segment. On the pro- 

 boscis the separation is abrupt between the proximal papillated region and 

 the smooth epithelial distal one. 



The first setigerous segment is provided with notopodia only; they 

 resemble those in the next 13 segments but the size of the fascicles 

 increases gradually, going posteriorly to the middle thoracic region. 

 Neuropodial fascicles are present from the third segment and continued 

 posteriorly through only 12 segments. In one individual (1107-40) the 

 sixteenth segment is provided with only hooded hooks in both notopodia 

 and neuropodia but in the other (1265-41) the notopodium has also a 



