48 University of California Puhlications in Zoology [Vol. 18 



DESCRIPTION OF NEW SPECIES 

 The species of Polynoidae in these collections were mostly well 

 known or previously described. The following species, Harmothoe 

 honit crisis, Harmothoe johnsoni, and Halosydna macrocephala, are 

 new. 



Harmothoe bonitensis sp. nov. 



PI. 2, figs. 1-11 



Description. — A rather small-sized polynoid; the 32 anterior seg- 

 ments measuring 25 mm. in length, and the width at the widest part 

 of the body, between the tenth and twelfth segments, is 5 mm. The 

 dorso-ventral diameter is 1 mm. The worm is very much flattened 

 dorso-ventrally and rounded at both ends. The anterior parapodia 

 are shorter than those toward the central portion of the body. Thus 

 the anterior end appears narrower, increasing in width up to the 

 twelfth segment, where the maximum width is reached. The width 

 decreases then gradually toward the posterior end. The color of the 

 body is yellowish gray. There are only 32 anterior segments. The 

 extreme posterior segments are missing. 



The prostomium (pi. 2, fig. 1) is deeply fissured, with prominent 

 acuminated peaks. The length of the prostomium is two-thirds of the 

 width. The four pairs of eyes are comparatively large. The anterior 

 eyes are situated in the widest part of the prostomium near the dorso- 

 lateral margin. They are pointed anteriorly and laterally. The 

 posterior eyes are smaller and are situated near the posterior end of 

 the prostomium. They are closer together medially, and look poste- 

 riorly and upward. The cirratophore of the median tentacle is promi- 

 nent, inserted between the prostomial lobes. The style of the median 

 tentacle is missing. In this specimen the short lateral tentacles arise 

 from short cirratophores, ventrad and mediad of the acuminated 

 peaks. Their length is about two-thirds that of the prostomium. The 

 palpi are white, stout at the base, decreasing in diameter very grad- 

 ually and terminating in fine tips. Their length is nearly five times 

 the length of the prostomium. They are densely covered with club- 

 shaped sensory cilia, which are arranged spirally. The cirratophores 

 of the peristomial cirri are long, equal in length to the prostomium, 

 but the styles are missing. The dorsal cirri of the other segments 

 (pi. 2, fig. 5) are white, of medium length, their tips extending to 



