NO. 2131. 



NEMATODE PARASITES OF RODENTS— HALL. 



105 



Fig. 132. — Dermatoxys ge- 

 TULA. Posterior extrem- 

 ity OF YOUNG MALE, VEN- 

 TRAL VIEW. Enlarged. 

 After Seurat, 1915a. 



Larva. — Larvae of both sexes in the fourth stage are frequently 

 found among the adult worms. The female larva is 2.3 mm. long and 

 has a relatively larger esophagus than the adult, the esophagus being 

 two-fifths of the entire body length; the 

 vulva is anterior of the middle of the body 

 and is covered by the larval cuticle. The 

 male larva is 1.6 mm. long and also has a 

 relatively larger esophagus, equaling one- 

 third of the entire body length; the tail is 

 folded at its extremity. Just after the last 

 ecdysis the young male is still without the 

 prominent bursal alae of the adult (fig. 132). 



Host. — Atlantoxerus getidus {Xenis getu- 

 lus). 



Location. — Cecum. 



Locality. — Moga dor, ^lorocco. 



Seurat states that this species has affinities 

 with Oxyuris polyoon von Linstow from 

 Xerus setosus. 



Family uncertain. 



HETERAKIS VERRUCOSA Molin, 18606. 



Specific diagnosis. — Genus? Head not distinctly delimited from 

 body. Body strongly attenuate posteriorly and adorned laterally 

 with warty prominences arranged in a double series and continu- 

 ing to the posterior extremity of the tail. xVnterior extremity trun- 

 cate, the mouth without lips or papillae and the cuticle loose and 

 folded about the mouth. The esophagus ends in a bulb with a tooth 

 apparatus. The intestine is composed of large cells, and there are 

 three large cells at the rectum. 



3Iale 7.5 mm. long and 300 fi thick. The caudal extremity is 

 curved in a hook shape, subulate, and terminates in a sharp tip. 

 There are two very slightly curved spicules with 

 alate membranes. 



Female 12 mm. long and 500 ]}. thick. The 

 caudal extremity is straight and subulate, termi- 

 nating in a sharp point. The eggs (fig. 133) are 



Fig. 13.3.— Heterakis vee- ^ ^ \ '^^ ^ 5^ 



rucosa. Eggs. Magnified, flattened on one Side and are 100 [ji. long, ihe 

 AFTER VON DRAscHE,is83.g|-^gllg j^^,g perpeudicularly striate. 



Host. — Dasyprocta aguti {Dasyprocta agouti). 



Location. — Stomach. 



Locality. — Brazil (Caigara). 



Molin states that this w^orm is meromyarian, and von Drasche 

 (1882) has pointed out that on this account it can not be a species of 

 Heterakis. The fact that no sucker is mentioned and that tlie worm 



