1917] EssPAiherg: New Species of Polynoidae 53 



broader, the length being two-thirds of the width. The parapodia 

 also differ in shape in the two species. In Harmotho'e complanata the 

 dorsal ramus or the notopodium is very much shorter than the neu- 

 ropodium, having about less than one-half of the length of the neuro- 

 podium, while in HarmotJioe johnsoni both rami are almost equal 

 in length (pi. 2, fig. 14). The stout dorsal setae of Harmotho'e com- 

 planata are serrated, those of Harmothoe johnsoni are perfectly 

 smooth. The nephridial papillae in Harmothoe complanata have 

 acuminated tips; they are uniform in width ending abruptly in 

 Harmothoe johnsoni. The color of Harmothoe complanata in the 

 alcoholic specimens is reported by Johnson (1901) to be pale brown 

 and a specimen in the Zoological Museum of the University of Cali- 

 fornia is also of a brown color, while the color of Harmothoe johnsoni 

 is light gray. The color, however, is not of great importance in classi- 

 fication. 



Occurrence. — The single specimen which is now in the Zoological 

 Museum of the University of California, was given to the writer by 

 Mr. H. 0. Falk, who had found it December 4, 1915, at a low tide 

 on the beach off La Jolla, near San Diego, California. 



Halosydna macrocephala sp. nov. 



PI. 3, figs. 22-33 



Description. — The shape of the body is flattened and uniform in 

 width, narrowing gradually toward the posterior end, rounded at 

 both ends. The two specimens are 40 mm. and 25 mm. long, and 10.5 

 and 7 mm. wide respectively, with 5 mm. between parapodia. The 

 dorsum is covered with widely overlapping elytra. 



The prostomium (pi. 3, fig. 22) is unusually broad, the width 

 being more than twice the length. It is very convex, forming a deep 

 median fissure and sloping down abruptly on both sides. Of the two 

 pairs of eyes those of the anterior are considerably larger and are 

 situated near the lateral margins in about the widest part of the 

 prostomiums. The posterior eyes are smaller, nearer together, and 

 are situated at the extreme posterior margin of the prostomium, so 

 that they are partly concealed by the peristomial fold. The strongly 

 developed cirratophore of the median tentacle is inserted between 

 the anterior cephalic prolongations. The style of the median tentacle 

 is lost in both specimens. The stout lateral tentacles, arising from the 

 anterior prostomial prolongations are about one-lialf of the length 



