1914] Treadicell: Polychaetous Annelids of the Pacific Coast 203 



podial tuft being the longest of any. Each seta curves gently to an 

 acute apex. In formalin the hody is a uniform light brown. 



Type collected from Shumagin, Alaska; others from the Popof 

 Islands of the Shumagin group. 



Type in the Museum of the University of California; co-type in 

 the American Museum of Natural History. 



Polydora californica sp. nov. 



PI. 12, figs. 23-29 



This species is represented by an incomplete specimen having a 

 body-width of rather less than one millimeter. 



The head has a median "caruncle" which protrudes anteriorly 

 beyond the margin of the head, and extends to between the bases of 

 the tentacles. On either side of this "caruncle" there is a flattened 

 wing-like area, and the apices of these two areas, together with the 

 end of the median lobe, from the anterior margin of the head (pi. 12, 

 flg. 23). On either side of the median lobe is a dark brown band of 

 pigment. The tentacles are three millimeters long, or six times longer 

 than the head, and their width, at their bases, is about one quarter 

 that of the head. There are two pairs of small black eyes concealed 

 by the bases of the tentacles. 



The anterior end of the body is flattened dorsally, gills appearing 

 on the second setigerous somite. At first these gills are lateral and 

 those on opposite sides of the same somite are separated by a con- 

 siderable space. In later somites they gradually approach the dorsal 

 surface, becoming strictly dorsal in the fifteenth somite. The gills are 

 at first very short, but increase in length up to the seventh pair, which 

 meet on the mid-dorsal line. Toward the posterior end the gills are 

 smaller and are entirely missing on at least the last eighteen somites. 



The fifteenth and later somites are nearly circular in cross sec- 

 tion, except at the very posterior end, which is again flattened. For 

 the first fifteen somites the only color is in the gills, which are dark 

 brown. From the fifteenth to the fiftieth somite the dorsal surface is 

 light reddish-brown, broken by a median colorless band and by a 

 similar colorless line marking the somite boundary. The remainder 

 of the animal is colorless. The body noticeably narrows toward the 

 posterior end but the pygidium was not preserved. 



The first parapodium is inconspicuous and its notopodial setae lie 

 just ventral to the bases of the tentacles. The neuropodium and noto- 

 podium are each provided with a postsetal lobe, that of the notopodium 



