222 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



Epitokous individuals from Ecuador (11-33 and 13-33) include some 

 females that are less than half as large as some of the males. In the former 

 there are 17 anterior setigerous segments, of which 5 have enlarged dorsal 

 cirri. In the male there are 15 (16 in one) anterior setigerous segments, 

 of which 7 have enlarged dorsal cirri. 



A specimen from 148-34 has the following proboscidial formula: area 

 I with a single, larger cone; area II with about 12 cones in 2 elongate 

 rows; area III with 10 to 12 in a broad patch; area IV with a crescent of 

 about 12 cones; area V with none; area VI with 4 or 5 tall cones; areas 

 VII and VIII with a single row of few (4 or 5) widely spaced cones. 

 Paragnaths of the maxillary ring are much the larger, and much more 

 numerous. Those of the oral ring are few, small. Jaws have about 8 well- 

 developed oblique teeth on the cutting edge. 



Nereis amhiguus Treadwell (1937, p. 149) from Clarion Island has 

 the dark parapodial lobes characteristic of A^. riisei, and homogomph fal- 

 cigerous setae as in this species. Its description agrees reasonably well with 

 that for N. riisei. 



Nereis paucignatha, new species 

 Plate 36, Figs. 58-62 



Collection. — 21-33. 2 male epitokous individuals. 



Length 37 mm; number of segments 108, including 38 anterior para- 

 podia and 70 provided with natatory appendages. The prostomium is 

 broadly rectangular, the 4 eyes large though well separated, each with a 

 minute pale lens (pi. 36, fig. 59). Prostomial antennae extend distally 

 beyond the palpi but are somewhat wrinkled. The peristomial cirri are 

 long, cirriform, and wrinkled terminally as in the prostomial antennae. 



The proboscidial formula is as follows: area I with none; area II 

 with 3 to 5 cones in a row; area III with 1 to 4 cones in a transverse 

 row ; area IV with about 9 cones in 2 rows ; area V with none ; area VI 

 with only 2 cones ; area VII with 6 cones in 2 rows, widely spaced, those 

 on the maxillary side the largest; area VIII with none. Jaws have about 

 7 slightly oblique teeth on the cutting edge, and a distal curved fang. 



Dorsal cirri of the first 7 parapodia are thickened, elongated. Para- 

 podia anterior to the natatory region have slender lobes, extending distal- 

 ly not quite so far as the dorsal cirri. The dorsal and ventral cirri are 

 similar to each other except that the dorsal are somewhat the longer (pi. 

 36, fig. 60). Notopodial setae include homogomph falcigerous setae, the 

 appendage long, serrated along one edge (pi. 36, fig. 58). Neuropodial 



