64 CAMl'OKMA ACAKKMV OK SCIEXCKS. 



Phcenicodrilus taste n. sp. 



The size is that of a very large Ocnerodrilus though even fully matured speci- 

 mens varied greatly as to length. My largest specimens, which first had heen slowlv 

 killed hy dropping solution of corrosive suhlimate in the water dish and then extended 

 before being hardened with alcohol, reached 2| inches b}^ 1^ line in thickness at the 

 clitellum. Average-sized specimens were considerably over 2 inches long. Tiiis refers 

 to the mountain specimens collected in the Sierra El Taste; the lowland specimens 

 from Pescadero were much smaller not reaching the 2-in(!h mark. The body is 

 slightly tapering towards the tail end. The somites are well set, those of the clitellum 

 are hardly distinct. The prostomiura is not long, but broad, dovetailing the peristo- 

 mium about one-half. From here on the somites gradually, though slightly, increase 

 in size until somite x which is a little the largest, xi, xii and xiii are smaller. The 

 somites posterior to the clitellum are slightly larger than somite x, except the last few 

 posterior ones. 



Clitellum comprises somites xiv to viii. Vertically it ends at a line drawn 

 halfway between setae 2 and 3, slightly receding in somite xiv. Strictly speaking the 

 clitellum does not enclose the male pore, as the pore is situated more venti-ally than the 

 thick clitcllar layer, and between that and the pore there is no connecting ridge or 

 papilla. 



An accessory copulatory swelling is seen around the outer couple of setae in 

 somite xiv (fig. 26. c. c), the body-wall here being raised like a small mound, with 

 the sette slightly outside of its center, from which the cells are arranged as radii in a 

 circle. 



The male pore is surrounded only by a very small ridge or papilla, not high 

 enough to be seen witli a magnifying glass sufficiently strong to reveal the elevated 

 papillic of the oviducts. But the whole zone around the male pore is often considerably 

 elevated, turned inwards or towards the median line of the body and rounded 

 forming a longitudinal groove. 



Exterior pores. The spermathecal pore is situated in the intersegmental groove 

 between somites viii and ix, in front of and slightly outside of seta 2, the inner angle 

 of the pore being in line with that seta, while the body of the papilla is situated more 

 dorsally. The ovipore is situated close by, in front of, but not outside of seta 2. The 

 male pore is situated in xvii exactly in a line with seta^ 1 ami 2 according to the lon- 

 gitudinal muscular fibres, but as the body-wall is slightly contracted in this somite the 

 pore appears as if situated slightly more ventrally; the exact location is, however, the 

 jjlace left vacant by the absence of the ventral couple of setic. This couple (setje 1 

 and 2) are never, at least not in adult specimens, found developed in this somite, 

 though the tips of the young reserve setic are sometimes seen in their sac close to the 

 pore. 



Nephropores open in line with seta 2, and are situated in the anterior one- 

 third of the s|)ace between the seta' and (he anteiinr septum. The pores are large, 

 round and easily distinguished. 



