490 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 10 



based on these characters. Cabira is too incompletely known to be com- 

 pared with other known genera. 



(The original account of Cabira has probably confused dorsal and 

 ventral rami in describing the arrangement of acicular hooks and 

 setae; these heavy hooks are perhaps actually dorsal. Fauvel (1920, 

 p. 206) suggests further that the prostomium probably also had 

 originally a median antenna which was lost before the description was 

 made. The generic name is perhaps best dropped from the literature.) 



Key TO Genera 



1. Prostomium with a pair of thin, lateral plates with papillated 

 surface; neuropodia with heavy, recurved hooks .... 



. Cabira 



1. Prostomium without such lateral plates; neuropodia without 

 recurved hooks .......... 2 



2. Proboscis muscular, cylindrical when everted (pi. 63, fig. 1) . .3 



2. Proboscis epithelial, globular when everted; prostomium with 2 

 antennae Pilargis 



3. Prostomium without antennae (pi. 63, fig. 1) ; peristomium with- 

 out cirri 4 



3. Prostomium with 3 antennae (pi. 62, fig. 1) ; peristomium with 

 2 pairs of cirri Ancistrosyllis 



4. Prostomium with a pair of biarticulated palpi (pi. 63, fig. 1). . 

 . Loandalia 



4. Prostomium without palpi Talehsapia 



Genus PILARGIS St. Joseph, 1899 

 Type P. verrucosa St. Joseph 



Includes Phronia Webster, 1879, preoccupied. 



The body is very long, depressed and ribbonlike; it consists of many 

 similar segments. The prostomium is reduced in size and provided at its 

 anterior end with a pair of biarticulated palpi in which the base is mas- 

 sive ; the article is tiny and papillar. There are 2 short, simple antennae 

 inserted on the prostomial lobe, near the lateral or posterior margins. 

 Eyes are lacking in so far as known. The proboscis is a soft, epithelial, 

 globular, eversible sack and lacks armature. The first or peristomial 

 segment is provided with 2 pairs of short cirri ; they are typically conical 

 or fusiform in shape and sometimes conspicuously larger than the cirri 

 farther back. Notopodia are represented by a dorsal cirrus that is some- 



