84 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 7 



of P. oculea with P. melanonotus (Grube) suggested by Fauvel (1932, 

 p. 37) seems unlikely. 



Distribution. — West Indies; Panama; Lower California; Mexico. 

 Subintertidal to 20 fms. 



Polyodontes panamensis (Chamberlin) 



Plate 24, Figs. 289-292 



Panthalis panamensis Chamberlin, 1919a, pp. 86-89, pi. 11, figs. 4-8, pi. 

 12, figs. 1-6. 



Collection. — 198-34. One specimen. 



A single, anterior fragment consists of 36 segments. The prostomium 

 and first segment had withdrawn into the oral area and could be 

 observed only by laying open the proboscidial region. The prostomial 

 parts and its appendages are arranged about as shown by Chamberlin 

 (1919a, p. 86) but the ommatophores are more conspicuous, the large 

 black eyes occupying at least the distal two thirds of the stalk. The first 

 parapodium is larger than the one following, and its ventral cirrus (pi. 

 24, fig. 290) both thicker and longer than those following (pi. 24, fig. 

 289). Elytra are circular to transversely elongated (pi. 24, fig. 291), 

 the point of attachment near the external margin. They are translucent, 

 smooth, with entire margin, the texture finely and uniformly reticulated. 

 No parapodial branchiae have been observed. 



Setae include a superior fascicle of numerous, long, slender spinose 

 pointed setae, a median fascicle with 6 to 8 heavy, aristate setae (pi. 

 24, fig. 292), and a ventral fascicle of about 10 serrulated setae (pi. 

 24, fig. 293). 



This species is transferred to the genus Polyodontes because it lacks 

 true penicillate setae and has, instead, long, pointed, superior neuro- 

 podial setae. 



Distribution. — Panama; Galapagos. Shore to 89 fms. 



Polyodontes frons, new species 

 Plate 25, Figs. 300-308 



Collection. — 443-35 (Holotype). One specimen. 



A single, more or less complete individual consists of prostomium 

 and 37 setigerous segments, and a few regenerating segments at the pos- 

 terior end. It is pale except for black eyes and dusky crescents on the 

 elytra. The dorsum is broadly exposed through about the first 20 seg- 

 ments, where the body is broadest. 



