100 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 50. 



tending from the head to a point posterior of the esophageal bulb. 

 Excretory pore very small and difficultly visible, situated posterior of 

 the esophageal bulb. Mouth with three well-developed lips, each 

 bearing three papillae. Buccal cavity very shallow, closed anteriorly 

 by three teeth inserted on the three lips. The esophagus terminates 



l)osteriorly in a bulb, the union being 

 marked only by the external widening 

 and, frequently, by some rugose mark- 

 ings; the esophagus proper, exclusive of 

 the bulb, is widened anteriorly to form a 

 short thick portion and diminished pos- 

 teriorly to form a long slender portion, 

 the latter showing a variable and very 

 noticeable brown pigmentation. The 

 esophagus length, including the bulb, is 

 one-ninth of the length of the female and 

 two-fifteenths of the 

 length of the male. 

 The nerve ring en- 

 circles the esophagus 

 proper at the union 

 of the anterior and 

 middle thirds. 



Male 8 to 11.5 mm. 

 long, with a maxi- 

 mum thickness of 435 

 [L. The body is 

 straight, with a mod- 

 erate curve ventrally 

 at its posterior ex- 

 tremity. The caudal 

 bursa (figs. 122 and 

 123) is formed of 

 two very long alae, 

 1.5 mm. long and 

 rather wide, with a 

 very distinct border 

 marked by several 

 fine parallel longitudinal striations; the alae are curved ventrad and 

 meet posterior of the conical termination of the body proper. The 

 distance from this conical termination to the cloacal aperture is 

 about 400 \i. About 700 [jl anterior of the cloacal aperture is a series 

 of 10 to 17 cuticular crests, of variable size and slightly irregular 

 outline approximating that of a sector of a circle, the crests being 

 disposed in a somewhat irregular longitudinal series. Between this 



Fig. 122.— Dermatoxys veligera. 

 Posterior extremity of male, 



\'ENTRAL VIEW. AFTER SEURAT, 



19156. 



Fig. 123.— Dermatoxys 

 VEUGERA. Posterior 



EXTREMITY' OF MALE, 

 VENTRAL VIEW. EN- 

 LARGED. After Schnei- 

 der, ISCf). 



