1914] Treadwell: Polychaetous Annelids of the Pacific Coast 191 

 Nereis notomacula sp. nov. 



PI. 11, figs. 8-12 



The prostominm is bluntly rounded anteriorly, its anterior third 

 being roughly rectangular in outline and its posterior two-thirds 

 rounded (pi. 11, fig. 8). The eyes were not clearly seen, their position 

 being indicated merely by a pair of swellings on either side of the 

 head. The antennae are about as long as the head and gently taper 

 to their apices. The tentacular cirri are unequal in length, the dorsal 

 ones reaching to the eighth setigerous somite while the ventral ones 

 are much shorter. Each has a prominent basal piece and a long 

 tapering terminal joint. The basal part of the jaw is black and the 

 terminal portion is translucent brown. The jaw has eight to ten 

 teeth along its concave edge. There is an oval area of paragnaths 

 near the base of the jaw with eight vertical rows of paragnaths just 

 below it. The head, body, and basal joint of each cirrus are dark 

 brown, while the terminal parts of the cirri and palps are colorless. 

 At the end of the basal joint of each palp is a band of dark-brown 

 spots. Near the apex of the prostomium are a median and two lateral 

 dark patches of pigment with a line extending from each lateral patch 

 nearly to the posterior border of the head. Just behind the anterior 

 border of each somite is a transverse row of dark spots which, through- 

 out the posterior part of the body, terminates in a prominent black 

 spot just dorsal to the parapodium. The first four parapodia show 

 much black pigment in both rami while in the next nine or ten, pig- 

 ment is present only in the basal portion of the dorsal cirrus. Through- 

 out the posterior part of the body the pigment is arranged in promi- 

 nent patches, one dorsal and one ventral to the parapodium on the 

 body wall, one on the basal part of the dorsal cirrus, two in the 

 notopodium, and one in the neuropodium. 



The first parapodium ( pi. 11, fig. 9) has single dorsal and ventral 

 lobes, and narrow postsetal ones. There is a single dense tuft of 

 compound setae of the usual Nereis type with rather large terminal 

 joints. The dorsal cirrus extends for more than half its length be- 

 yond the parapodium, while the ventral cirrus is hardly longer than 

 the parapodium. 



Of the subsequent parapodia (pi. 11, fig. 10 of the 8th) those 

 from the fifth to the thirteenth are very thick and fleshy. There are 

 two equal postsetal notopodial lobes, and one large and one very 

 small postsetal neuropodial lobe. In addition; there is an incon- 



