30 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 50. 



the vesicula seminalis, which terminates in a constriction followed 

 by the ductus ejaculatorius, which opens into the cloaca. The 

 spicule (fig. 33) originates bluntly or with a slight knob, and is 

 slightly attenuated from the anterior end posteriorly, terminating 

 in a sharp point; it is 5 to 7 mm. long and with a fairly uniform 

 diameter of about 25 fi. The spicule sheath has a maximum external 

 length of about 1.55 mm. and a width of about 90 fx. The sheath 

 has a bulbous enlargement at the end when evaginated and is covered 

 with little spines about 5 /* long. The cloacal aperture is located 

 between two short lobelike projections at the posterior end of the body. 

 Female 50 to 70 mm. long with a maximum diameter of about 1 

 mm. Ratio of length of anterior esophageal portion of body to 

 length of posterior portion varies from 2:1 to 3:1 (fig. 32). From 

 the vulva the vagina extends back about half the length of the 

 posterior portion of the body, continues as the uterus to the posterior 



end of the body, turns forward as the 

 oviduct and extends to the vulva region 

 again, turning back here as the ovary 

 and extending to its termination in the 

 posterior end of the body. The vulva is 

 covered with little spines. Terminal end 

 "°-"-?»»R™;m" ""• of the body obtuse. Eggs (fig. 34) dark 



brown, lemon-shaped, 70 to 80 [x long in- 

 cluding the opercular plugs, 55 to 65 p, long excluding the opercular 

 plugs, and 30 to 35 \}. wide. 



Hosts. — Hystrix cristata. Usually found in ruminants and com- 

 mon in quite a number of these. 

 Location. — Large intestine. 



Locality. — Not specified for Hystrix cristata. Cosmopolitan for 

 other hosts. 



This species is recorded from Hystrix cristata by Diesing (1851) 

 from the Vienna Museum. Von Linstow (1906), in describing 

 Trichuris infundihulus from the same host, has noted it as unlikely 

 that such a record should be correct, but although there is a possi- 

 bility of error or misidentification in this record, it must be pro- 

 visionally accepted in the absence of further data. 



-HEPATICOLA Hall, 1916, new genus. 



Generic diagnosis. — Trichurinae (p. 19) : Anterior esophageal por- 

 tion of body shorter than the posterior portion, which is only slightly 

 thicker. No spicule. BaciUary band apparently not i)i-esent. 



Type-species. — Hepaticola hepatica (Bancroft, 1893) Hall, 1916. 



