PACIFIC COAST OLIGOCH^TA. 135 



Benhamia papillata n. sp. 

 Figs. 43 A, B, c, D, e; 52. 



Habitat. Tepie, Territory of Tepic, 4000 feet; Mexico. 



I am unable, on account of want of time, to add any detailed description to the 

 short definition of this species given above. When I described Benhamia pnhnicola 

 I possessed only a single specimen of B. papillatn, and I supposed that the differences 

 in the structure of some of the organs, as well as the presence of the prostate papillae, 

 were due exclusively to individual variation. But while this paper was being printed 

 I became possessed of about twenty specimens from the same locality, all of which 

 resemble each other in all the points referred to in the description, and I therefore 

 do not hesitate now to assign to them a specific name, especially as I find that this 

 species is much more distinct than I at first suspected. While it in many respects 

 resembles B. Bolavi, it differs in other points which must be considered of specific im- 

 portance. B. j)apiUaia differs thus from B. Bolari in possessing four exterior tubercles, 

 one for each prostate 25ore. The smaller penial seta in B. Bolari is flat and somewhat 

 forked, while in B. lyipillata the sraallar seta is furnished with a sigmoid tip of ex- 

 ceeding thinnesss. The clitellum in B. Biilari and B. palmicoJn is incomplete, but 

 in B. ■papillata it is complete even on the ventral side, showing several rows of glan- 

 dular cells, but the width of the layer of clitellar cells is much narrower in the central 

 part. Clitellum is ventrally complete only in somites xiv, xv and xvi. 



The following are the other points of interest as regards the character of this 

 species: It is larger than B. pahnicola. The four papilhc, each one of which 

 carries a prostate pore, are very distinct and prominent, and they stand close together 

 in the sunken genital pit of the clitellum. The median central papilla, on which open 

 the ovipores, is elevated and oval. The two ovipores are situated in the center of the 

 papilla, but entirely separate. They are in the very center of the somite and in a 

 line drawn between setse 1 and 1. In B. pahnicola the ovipores join, and the common 

 pore is situated somewhat in front of a line drawn between setiie 1 and 1. Longitu- 

 dinal section of a specimen shows that the septum separating somites xiii/xiv is very 

 much cupped, and the oviducal funnel is situated exactly above the central papilla in 

 xiv and dips down straight to the ovipore. The anterior septse are hardly thicker 

 than the posterior ones, but they are all very much cupped. Sacculated intestine 

 commences in xix. There is a strong superior typhlosole in xx to xiv. Of the three 

 pairs of calciferous diverticula the anterior one in xv is very much, or about four 

 times, smaller than each of the posterior ones. The glandular part of the prostate is 

 folded and quite thick, but confined to one somite. 



Penial setai. The penial setae are the most distinct character of this species, 

 besides the tubercles of the prostate pores. In general shape the two setae are much 

 more slender than those of B. palmicola, and several times narrower at the apex. They 

 are so thin that it required an oil-ira. 1/12 to show their structure sufficiently to enable 

 me to .sketch it. The larger seta is slightly curved, gradually tapering from the root 

 to the apex. The apex is much less curved than that of B. Bolavi or B. palmicola, 

 and furnished with seven or eight shallow but still distinct notches. But the smaller 



