65 



the outside like an interlabial tooth. About (lie bases of tin- 

 lips the body cuticle rises into a collar of small and irregular 

 eminences. Tin-re is a well-marked oral cavity (Fig. 5, /), 

 the base lying about the same distance back of the base of the 

 lips as the lateral lips rise in height above their base; base 

 of cavity horizontal, its lateral walls rising from it at nearly 

 right angles. Tlie esophagus i Figs. 1 , 2, and f>, g) is long and 

 slender (in male of over s mm. length it measures 2..") mm. in 

 length; in female of ll'. mm. length, 15..") mm.); for a short 

 distance from the base of the oral cavity it is thin-walled and 

 narrow, thereafter widening and becoming thicker-walled and 

 definitely muscular. It opens into the intestine by a rather 

 prominent valve-like arrangement. The intestine is straight 

 and o|H-ns in the female snbterminally il).2 mm. from tip of 

 tail); and in the male a little more anteriorly (0.35 mm. from 

 tip of tail) in a cloaca. Caudal end of male (Fig. 8) provided 

 with lateral alar cuticular expansions (not quite symmetrical) 

 supported at base by irregular and small rays from the body 

 wall,), enclosing a bursa. The cuticle within this bursa is 

 arranged in long rectangular plates, running in the long axis 

 of the worm and contrasting sharply with the transverse 

 stria- of the rest of the cuticle. Within this bursa are ten 

 pairs of papilla- and one unpaired precloacal papilla. These 

 are arranged as follows from tip of tail forward: Nos. 1, 2, 3, 

 and 4 (Figs. 8 and 9) are quite small and situated just in 

 front of tip of tail, No. 2 (smaller than No. 3) and No. 3 

 nearly on same level (No. 2 median to No. 3); equal dis- 

 tances between Nos. 1, 3, and 4. No. 5 is about half-way 

 between tip of tail and cloaca, larger than the alx>ve; No. 6 

 about half-way between No. 5 and cloaca, this pair not 

 entirely symmetrical; No. 7 at or just in front of cloaca; 

 Nos. 8, 9, and 10 in row anterior to No. 7, and separated 

 from No. 7 and each other successively by uniformly increas- 

 ing distances. Nos. 5, 6, 7, 8, 9, and 10, and the unpaired pre- 

 cloacal papilla, considerably larger than Nos. 1, 2, 3, and 4. 

 Male spicules unequal. Testicular tubes plicated along the 

 intestine. 



