% 



NEW NORTH AMERICAN EARTHWORMS 175 



pairs, or five single pores. A gizzard in the region of segments 

 v-vii. Purely meganephridial. Prostates tubular, with simple 

 unbranched canal." 



PLUTELLUS GARLOUGHI, new species 



Distinguishing characters. — Length of preserved specimens, not 

 strongly contracted, averages about 115 mm. Diameter, approxi- 

 mately 4 mm. Average number of somites, about 166. Setae are 

 widely paired, approximately aa '.ah '.he: cd== 5:2:3:3, anterior to 

 the clitellum. Penial setae long, slender, curved in sagittal plane 

 with convex side anteriad ; length about 1 mm and diameter slightly 

 less than 0.02 mm. Clitellum 13-18, much thinner on midvcntral 

 part. Ventral median papilla, small and circular on 10/11; occa- 

 sionally on 9/10 or 11/12, and 15/16. Paired transversely elongate 

 papillae on 19/20 and in some specimens on one or more following 

 somites. Male pores on 18 in seta line h and closely approximated to 

 penial setae. Oviducal pores on 14, about midway between seta line a 

 and the midventral line. Spermathecal pores at 7/8 and 8/9 in seta 

 line h. Calciferous gland of simpler type, includes posterior part 

 of 9 and extends to middle of 15. Paired dorso-esophageal hearts 

 seem to be lacking in thirteenth somite. Spermathecae of 8 are 

 somewhat smaller, and the diverticulum of the duct has one chamber 

 with ridged lining, while there are three or four such chambers in 

 the diverticulum of each of the spermathecae of 9. 



Material. — About 20 specimens were received from F, E. Garlough 

 in March 1931 that had been collected at Multnomah, Oreg., in the 

 preceding month. Most of them were apparently not much con- 

 tracted, and several had the reproductive organs fairly well de- 

 veloped. Transverse sections were prepared from one-half of the 

 anterior 19 somites of the holotype (U.S.N.M. no. 20249) and sagittal 

 sections from one-half of the anterior 19 somites of the paratype. 



External characters. — No definite pigmentation is obvious in the 

 preserved specimens. The length of 11 apparently complete ones 

 that were measured is 105-125 mm, and that of the type specimen is 

 113 mm. The diameter is approximately 4 mm, a little less posteri- 

 orly. Somites 10-12 are definitely less in diameter than adjacent 

 ones. The number of somites is 157-176, with an average of 166, 

 and in the type there are 167. The setae spacing is somewhat variable 

 and anterior to the clitellum is approximately aa'.db'.hc.cd— 

 5:2:3:3 and posterior to the clitellum aa : ah : he : cd==7: 3:5:4; dd 

 is about one-third of the circumference. The setae are slender and 

 variable in length and anterior to the clitellum 0.4—0.525 mm in 

 length. The distal part has fine sculpture, most evident near the 

 tip. Setae a and h of 18 are long, slender penial setae, with a nearly 



