154 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.2 



the spicule, the size and shape of the accessory piece, the fewer genital 

 papillae, and the shape of the caudal alae. 



The following characters distinguish this species from A. labicula: 

 the number of cephalic papillae, the shape of the mouth, the more 

 distinct lips, the nature of the genital papillae, the absence of distinct 

 cloacal lips, the size of the spicule, the size and shape of the caudal alae, 

 and the size and form of the male tail. 



Paralaeuris dorochila, new genus, new species 

 (Plate IS, figs. 28-33) 



The following description is based on the study of the smallest 

 worms in the collection. About 8 per cent of the collection consisted 

 of animals of this species. 



The body is spindle-shaped, tapering from about mid-body region 

 to the bluntly rounded cephalic region, and posteriorly more abruptly 

 to the long, finely pointed tail. The length of the male (fig. 28) varies 

 from 1.12 to 1.81 (average 1.41) mm. and the width varies from 0.084 

 to 0.147 (average 0.110) mm. The length of the female (fig. 29) 

 varies from 2.17 to 3.80 (average 2.79) mm. and the width varies from 

 0.161 to 0.245 (average 0.188) mm. 



The body is covered v/ith a clear cuticula which has distinct stria- 

 tions about 0.008 mm. apart. There are no lateral or cervical alae in 

 either sex. The male has well-developed caudal alae. 



The cephalic region (fig. 30) is indistinct. The diameter of the 

 cephalic region at the base of the lips is about 0.030 mm. There are 

 three simple lips which are bluntly rounded and slightly separated from 

 each other, and difficult to distinguish. The shape of the mouth and 

 the relation of the lips to the mouth were not determined as no satisfac- 

 tory en face views of the lips were secured. 



There are six cephalic papillae; two papillae are situated near the 

 anterior margin of each of the lips. Amphids were not observed. Each 

 of the ventrolateral lips has a small, sharply pointed, cuticularized an- 

 teriorly projecting structure which arises from the inner margin of the 

 lip. 



The esophagus is of the tj'pical oxyurid structure. It is muscular 

 throughout its length and is terminated posteriorly by a subspherical 

 bulb. The anterior end of the esophagus is bluntly rounded and slightly 

 larger than the mid-region. There is no constriction or isthmus between 



