178 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



6 or 7:3:5:5; dd about one-third of circumference. Penial setae 

 long, slender, curved in longitudinal plane with distal end finely 

 sculptured and protruding but little. Length approximately 0.9 

 mm and maximum diameter slightly less than 0.03 nun. Clitellum 

 includes 13-18 and much thinner in midventral part. Transverse 

 median papilla on 9/10 between seta lines h. Paired transverse pa- 

 pillae on 19/20 in line with ventral setae. Male pores on 18, in seta 

 line h and close to penial setae. Oviducal pores nearer to mid- 

 ventral line than to seta line. Spermathecal pores at 7/8 and 8/9 in 

 seta line h. Caleiferous gland much more highly developed in 15 

 and 16 than elsewhere. Sperm ducts of either side unite in 12, and 

 the ducts thus formed enter the f)rostate ducts near their connection 

 with the prostate glands. Spermathecae of 9 someAvhat larger but 

 otherwise similar to those of 8. 



Material. — Six specimens were received from F. E. Garlough in 

 March 1931 that had been collected in the preceding month at Mult- 

 nomah, Oreg. They were all strongly contracted and most of them 

 in a state of sexual inactivity. Sagittal sections from one-half of the 

 anterior part of the holotype (U.S.N.M. no. 20247) and transverse 

 sections of the other half were prepared. 



External characters. — The average length of four specimens is 

 about 49 mm and that of the type 53 mm. The diameter is about 

 4 mm in most of the specimens, and there is no noticeable contrac- 

 tion anywhere, other than near the extremities. The number of 

 somites in five apparently entire specimens is 108-124. with an av- 

 erage of 117, and in the type there are 124. The setae are widely 

 paired and the spacing anteriorly about aa : ah : he : cd=^ or 7 : 3 : 5 : 5 ; 

 dd is about one-third of the circumference; ah is somewhat less in the 

 clitellar region and aa correspondingly greater. The penial setae are 

 long, slender, and curved in a plane nearly longitudinal, with the 

 convex side anteriad. The rate of curvature is a little more pro- 

 nounced near either end than in the middle, but is nowhere very 

 abrupt. The distal ends of the setae are finely sculptured with 

 transverse ridges, which are most definite on the penial setae. The 

 length of the penial setae is slightly more than 0.9 mm, and the 

 diameter near tlie proximal end is slightly less than 0.03 mm and 

 still less toward the distal end. The distal ends protrude but little 

 and are closely approximated to each other and to the male pores. 



The prostoniium is small and epilobic. Posterior to the somites 

 are triannulate. The clitellum includes 13-18 and on the midventral 

 side of 14r-16 is much thinner than dorsally and is still less developed 

 on the ventral side ]:)Osterior to 16. A transversely elongate, median, 

 ventral papilla on 9/10 and extending on each side to seta line h 

 is present on the type and on each of most of the other specimens. 



