2 PEOCEEDINGS OF THE NATIONAL MUSEUM vol.80 



located farther posteriorly than the above-mentioned lips and are 

 situated nearly in the same circle with eight submedian papillae. 

 The esophagus is divided into an anterior, short, muscular portion, 

 about 610/t in length, and a posterior, wide, less muscular portion of 

 which the exact length was not determined because of the opacity of 

 the specimens. The nerve ring surrounds the posterior fourth of the 

 anterior part of the esophagus in both sexes. 



Male^ 75 mm. long by 550/i, wide, the diameter practically uniform 

 throughout. The cuticle is finely striated, but not annulated as in 

 the female. Testis single, reflexed ; tail surrounded by a cuticular 

 expansion in the form of a pair of alae supported by four pairs of 

 preanal papillae and one pair of postanal papillae. There are three 

 pairs of sessile, cone-shaped, subventral papillae near the end of the 

 tail ; the tail is cone-shaped and bears minute denticles. The spicules 

 are unequal, the left one being 2.35 mm. long by 12.5;u. in diameter, 

 and the right one 280/a long and 52)u, in maximum width. 



Female^ 520 mm. to 540 mm, long and 1.8 mm. to 2 mm. in maxi- 

 mum diameter. Both extremities are bluntly rounded, the posterior 

 being slightly more attenuated than the anterior. The cuticle is 

 marked by fine striations, as well as by irregular annulations, which 

 fuse with one another and do not extend completely around the body. 

 The vulva is situated 800/* from the anterior end of the body. There 

 are two ovaries; the anterior one twists about the intestine and 

 esophagus, while the posterior one extends nearly to the end of the 

 body. The anus is apparently atrophied. The uterus is filled with 

 embryonated eggs, which are nearly spherical and are 80)U, long by 69//. 

 wide. 



Host. — Python reticulatus (Schneider). 



Location. — Under the peritoneum. 



Distribution. — National Zoological Park, Washington, D. C. 



Type specijnens. — U. S. N. M. Hehn. Coll. No. 29265; paratypes. 

 No. 30767. 



HASTOSPICULUM ONCHOCERCUM, new species 



Plate 2 



Description. — Hastospiculum: Mouth opening surrounded by a 

 cuticular elevation as in H. setiferum., but elevation not set off so 

 distinctly dorsally and ventrally as in the foregoing species. The 

 blunt, paired, lateral, liplike projections, which arise from the outer 

 margin of the elevation, are quite square. The subcuticular tissues 

 form a structure that might be likened to an epaulette. The amphids, 

 which are prominent, open in the distal portion of the lateral pro- 

 jections of the "epaulette." Eight submedian papillae are present; 

 the four external submedian papillae have their bases in the dorsal 



