180 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



Drilonereis filum (Claparede) 



Fauvel, 1923, p. 436, fig. 174; Monro, 1933, p. 88. 



Collection.— 1130-40 (2). 



Included in this collection are an anterior end of 66 segments and 

 another shorter anterior piece. Parapodia and prostomial parts are much 

 as in D. falcata (above), but the proboscidial armature is different. Here 

 maxillae I are strongly falcate, without teeth at the base, maxillae II 

 have 8 or 9 teeth on a side, decreasing in size basally, maxillae III and 

 IV have each a single tooth. A fifth plate is lacking. The mandibles are 

 united to one another for a short distance, the 2 pieces proportionately 

 longer than in D. falcata. 



Distribution. — D. filum, originally described from the Mediterra- 

 nean Sea, has been reported from other extra-American places. Monro 

 (1933, p. 88) has recorded it from Gorgona Island, Panama, in 15 fms, 

 and Ehlers (1887, p. 113) described Aracoda debilis from Florida, 

 which may belong here. The present record is the first from California. 



Genus LABIDOGNATHUS Caullery 

 Type L. parasiticus Caullery 



This genus has affinities with Drilonereis Claparede in its proboscidial 

 armature; the maxillary carriers are long, slender, with a median, un- 

 paired piece ; forceps are htzvy, falcate ; the other maxillary pieces are re- 

 duced, without dentate edge. Mandibles are probably absent. The para- 

 podia lack heavy, acicular, projecting spines, and setae consist entirely of 

 smooth limbate ones. It is endoparasitic, in the body cavity of other 

 chaetopods. 



Labidognathus forcipes, new species 

 Plate 13, Figs. 291-296 



Collection.— 1251-41 (1). 



A single specimen has been taken from the body cavity of a Eunice 

 fragment (see below) ; it is posteriorly incomplete, 140 segments measure 

 about 30 mm long. The body is lumbrinerid in shape and form. The 

 prostomium is flat, slightly depressed, a little longer than broad, anteri- 

 orly bluntly rounded ; it has neither eyespots nor pigment pattern. The 

 prostomium is weakly set off from the peristomium by a shallow groove. 

 The first 2 segments are apodous, the first a little longer than the second 

 (pi. 13, fig. 294). 



