140 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 22 



hooks. These terminate distally in a large fang surmounted by 2 teeth, 

 side by side, and are distally covered by a rounded hood. 



A posterior fragment has simple, digitate branchial processes in noto- 

 podia ; these lobes are a little longer than wide and perhaps not eversible. 



Notomastus precocis differs from other species of the genus in having 

 the last 3 thoracic neuropodia provided with hooks instead of setae. The 

 thoracic epithelium is smooth, whereas in most other species of the genus 

 it is more or less areolated. The species has been found only in subsill 

 parts of deep basins off southern California. 



Notomastus spp. 



Fragments of capitellids characterized by having 1 1 thoracic setiger- 

 ous segments, and only hooded hooks in the abdomen, have been recovered 

 from San Pedro, Tanner, San Nicolas and Velero Basins. They may be 

 referrable to one of the several species named from California (Hartman, 

 1947, p. 411). 



Capitellid, unknown genus and species 



A small capitellid was recovered from San Nicolas Basin; it has only 

 8 thoracic setigerous segments, followed by abdominal segments with 

 hooded hooks. It may represent an undescribed genus and species. 



Family MALDANIDAE 



Fifteen species are recognized and others are probably to be named. 

 They may be identified by the following key: 



Key to species 



1. Anterior end without a cephalic plaque (rimmed plate) 2 



1. Anterior end with a cephalic plaque 6 



2. Without cephalic or anal plaques 4 



2. Without cephalic but with anal plaque .... 3 



3. Anal plaque with entire margin . Notoproctus pacificus 



3. Anal plaque with 15 to 25 short cirri 



Nicomache lumbricalis 



4. With thick acicular spines in first 7 neuropodial segments 

 Praxillura maculata 



4. With thick acicular spines in first 4 neuropodial segments 5 



4. With thick acicular spines in first 3 neuropodial segments; a 



collar present on fourth segment . Clymenopsis cingulata 



