1914] Treadwell: Polychaetous Annelids of the Pacific Coast 185 



back to about the twenty -fifth somite, there is a wider uncovered area ; 

 this area narrows, at this somite, to less than the width of an elytron 

 and maintains this width to the posterior end. No specimen was 

 entire, the longest fragment having about twenty-five elytra. They 

 are on somites 2, 4, 5, 7, 9, etc., and are more or less pigmented. When 

 the pigment is small in amount it is collected near the elytrophore and 

 spreads from this towards the margin. In one specimen the elytra 

 were almost entirely dark brown, and in some others there was an 

 indication of a median dorsal longitudinal pigmented band on the 

 body wall. 



The protruded proboscis is as long as the first twenty somites. On 

 the mid-dorsal line at the apex of the proboscis is a rigid cirrus-like 

 process about equal to a palp in size. A much smaller process is oppo- 

 site it on the mid- ventral line. Between these two processes the soft 

 margin of the proboscis has about twelve lobes on either side, the 

 apex of each lobe being truncated and having a black pigment spot 

 on its outer surface. Above and below, on either side of the mid-line, 

 is a long, light-brown tooth, with rows of smaller teeth running 

 laterally from it. 



The first parapodium (pi. 11, fig. 2) is narrow and elongated, 

 with its presetal lobe longer and narrower than its postsetal one. 

 The postsetal lobe is in two parts, of which the dorsal is the larger. 

 Its ventral portion is apparently continuous with a short cirrus-like 

 lobe which lies in front of it. A spreading tuft of setae comes out 

 between these lobes. Bach dorsal seta has a long, smooth base, which 

 suddenly widens at about its middle and then gradually narrows to 

 an acute point. All of the terminal portion of each is armed along one 

 edge with several rows of very sharp spines (pi. 11, fig. 4). The setae 

 at the ventral edge of the tuft are smaller and not so numerous as 

 the others, but are similar to them in form. An aciculum extends into 

 the base of the elytrophore, and another extends into the parapodium. 

 The ventral cirrus is very long. 



The subsequent parapodia (pi. 11, fig. 3 of the 8th) are larger 

 and rielatively broader than the first, and the ventral cirri become 

 slightly smaller absolutely, and much smaller relatively, than on the 

 first. There are two sorts of setae on these parapodia. Ventrally there 

 is a tuft of sickle-shaped setae (pi. 11, fig. 5), each of which has its 

 central axis longitudinally striated at the bend, where a series of rela- 

 tively large spines begins. Toward the end of each seta these large 

 spines are replaced by several rows of much smaller ones. The details 



