NO. 2181. 



NEMATODE PARASITES OF RODENTS— HALL 



log 



m.: 



DERMATOXYS GETULA Seurat, igis?^. 



Specific diagnosis. — Dermatoxys (p. 99) : Two long cervical alae 

 (fig. 128) arising at the head, where they attain their maximum 

 width and gradually diminishing in width to the point near the 

 middle of the body where they terminate. The 

 cuticle is transversely striated at intervals of 9 

 [X. The excretory pore is very small and opens 

 in the center of a clear elongated elliptical 

 zone near the union of the intestine and the 

 esophagus. The mouth (fig. 129) has three 

 lijjs, a dorsal and two latero-ventral, each bear- 

 ing two papillae and with a triangular tooth 

 on the internal border ; the points of these three 

 labial teeth are in contact and limit the aper- 

 ture of the mouth. The buccal cavity is shal- 

 low, 20 [JL deep, and bordered laterally by two 

 rows of tubercles situated at two levels. The 

 esophagus is long and cylindrical and termi- 

 nates posteriorly in a spherical bulb provided 

 with teeth. The length of the esophagus and 

 bulb is a fourth of the length of the body in 

 the male and a fifth in the female. The nerve 

 ring encircles the esophagus one-seventh of its 

 length from the anterior end. 



3Iale 2.5 to 3.3 mm. long, with a maximum 

 thiclniess of 290 ]j.. Two very long caudal alae 

 (fig. 128) , as wide as the body, extend along the 

 posterior third of the body, terminating poste- 

 rior of the 

 cloacal aper- 

 ture and leav- /(p 

 i n g only a 

 short caudal 

 extremity de- 

 void of these 

 alae. The 

 cloacal aper- 

 ture (fig. 128) 

 opens 110 [i 



from this caudal extremity in the center of a very prominent conical 

 eminence; posterior of this eminence the body is abruptly truncated 

 ventrally and terminates in a narrow point 75 [x long, the orifices of the 

 caudal glands opening at the origin of this point. Anterior of the 

 cloacal aperture the ventral surface bears a curving longitudinal row 

 of about 25 transverse parallel crests (figs. 128 and 130). There is a 



Fig. 12S. — Deematoxys 

 GETULA. Male. E n- 

 LARGED. After Seu- 

 rat, 1915a. 



Fig. 129.— Dermatoxys getula. Ante- 

 rior EXTREMITY, DORSAL VIEW. EN- 

 LARGED. After Seurat, 1915«. 



