46 THE ANNELIDA POLYCHAETA. 



PODAEMUS PLOA, Sp. nOV.^ 



Plate 6, fig. 6; Plate 7, fig. f. 1, 2. 



Color indeterminable from types because of their darkening in the fixing 

 fluid. Probably colorless and transparent like most other pelagic species of 

 annelids. 



Body comparatively short. Widest toward anterior end, the anterior 

 end narrowing a little and the body narrowing very gradually and continuously 

 caudad. Length of type nearly 9 mm.; width over all, that is to end of setae, 

 about 4.2 mm. Total number of segments thirty. Number of pairs of ely- 

 trophores fourteen. 



The prostomium is wider than long. It bulges out on each side but the 

 outhne laterally is rather evenly convex, not at all angular. The prostomium 

 is divided symmetrically as usual by a deep median longitudinal furrow. Each 

 half is subquadrate, not at all somewhat diamond-shaped as in Harmopsides. 

 The ceratophores of the tentacles are cylindrical and extend directly forward. 

 That of the median tentacle is stouter and longer in a paratype, but differing 

 slightly in the type. The styles of the tentacles are broken off excepting one 

 lateral one in a paratype. This is slender and terete, distally narrowing gradu- 

 ally to an acute point, not abruptly reduced to a filament. It is considerably 

 shorter than the palpus. The palpi are slender and gradually acuminate, not 

 abruptly reduced distally. 



The parapodia of the peristomium occupy the usual position. The distal 

 ends of the ceratophores are nearly on a level with the anterior end of the pro- 

 stomium. The dorsal cirrus is gradually attenuate throughout its length. It 

 exceeds the palpus in length. Ventral cirri missing. 



Dorsal surface of metastomial segments convex, the ventral more flat- 

 tened as usual. • Neural ridge evident, rather narrow, set off by shallow fur- 

 rows. No anal cirri. 



Parapodia in the types as preserved relatively long, exceeding in length the 

 width of the segments to which attached. Subconically enlarged at base in the 

 usual way; distad of elytrophores and dorsal cirri slender and nearly cylindrical, 

 but a little less in diameter at middle than more distad. The end region of each 

 parapodium is flattened in the anteroposterior direction and in dorsal view 

 appears narrowed distad; the end is divided by a subvertical fissure sepa- 



' irXoas, floating. 



