2 PEOCEEDIXGS OF THE NATIONAL MUSEUM vol.74 



half its length, is much thinner walled and of greater diameter than 

 the distal, though it is possible that tliis may be in part due to the 

 preserving fluids. Rounded brown colored papillae (fig. 1) are 

 distributed over the surface of this proximal portion. Dorsally, 

 some eight rows of these papillae start at equal intervals on either 

 side of the mid line, each row running in a postero-lateral direction 



Figs. 1-3. — Phyllodocb nicoyensis, new species ; 1„ Prostomium and proboscis X 7.5 ; 

 2, Parapodidm X 22.5; 3, Seta X 250' 



around the proboscis. The anterior ones of these rows are the long- 

 est and meet from opposite sides on the mid- ventral lines. The more 

 posterior ones being shorter, end at the posterior margin of the 

 proboscis. Other short rows start from the circumference of the 

 end of the proximal region, those of opposite sides meeting in the 

 mid-ventral line. At the anterior end of this mid-ventral line is a 

 clear space, containing a few scattered papillae. The distal portion 



