162 PROCEEDINGS OF THE NATIONAL MUSEUM vol.84 



parently incomplete and has but 190 somites; the average numbei 

 in the other eight specimens of the two colle<;tions is 235 somites, 

 with extremes of 218 and 246. 



The setae are relatively small and inconspicuous. Anterior to the 

 clitellum only a few of the setae are visible superficially, and one-half 

 or more of them are lacking, although the setae sacs are present in nor- 

 mal number and arrangement. A similar condition exists in some other 

 species described in this paper. In some specimens penial setae are 

 present. Those in the paratype are about 1.5 mm in length, 0.027 nnn 

 in diameter tliroughout most of the length, curved in a nearly sagit- 

 tal plane with the convex side of the curve anteriad, and with slightly 

 more than one-third of the length protruding from the body and 

 directed posteriad. The sculpture is very fine and noticeable on only 

 the distal portion. The prostomium is prolobic. The first five or 

 six somites are biannulate or partially triannulate, and the others 

 are definitely triannulate. Tlie clitellum includes somites 13-22 and 

 part of 23 and is incomplete ventrally. Its color is reddish tan and 

 is more obvious in specimens having best developed reproductive 

 organs. Elsewhere the preserved specimens lack pigmentation. 

 Circular, median, ventral papillae are present on most specimens on 

 14/15, 15/16, and 16/17, and there are paired ventral papillae on 

 19/20 and 20/21. One specimen had an additional pair on 21/22, and 

 another specimen had a papilla on one side of 21/22. A pair of 

 prominent transversely elongate papillae on 18 bear the male pores 

 and closely associated penial setae. 



Dorsal pores are present in somites posterior to the clitellum. 

 Nephridiopores are very small and several on each side of most 

 somites. The male pores on 18 are slightly laterad of the penial 

 setae and very close to them. The pair of oviducal pores on 14 are 

 anterior to setae a and slightly mesad of them. Spermathecal pores 

 are paired at the anterior margins of 8 and 9 and between seta lines 

 a and h. 



Internal characters. — The septa 7/8-11/12 are strongly thickened, 

 those of 6/7 and 12/13 are somewhat less thickened, and 5/6 and 

 those posterior to 13 are of normal thickness. The pharynx has a 

 thick dorsal wall, and a powerful gizzard is present in 5. The inner 

 lining of the esophageal M^all of 6-10 has a few rather prominent 

 folds, which are mostly longitudinal. In 11-15 the esophagus is 

 somewhat dilated between the constrictions caused by the septa. The 

 enlargements in 12-14 are most pronounced, the maxinunn horizon- 

 tal diameter being about one-third of that of the bod}'. The inner 

 surface is very irregular, owing to the presence of numerous elongate 

 diverticula of which many extend nearly to the middle of the lumen 

 and some are more or less flattened. These diverticula are very 

 variable in length, width, and direction, and some of them are 



