1922.] H. A. Baylis and R. Datjbney : Parasitic Nematodes. 335 



The females measure from 16 mm. to 18 mm. in length and 0-46 mm. to 0*51 mm. 

 in thickness. The head measures 0*225 mm. in dorso- ventral diameter, is laterally 

 compressed, and is followed by a slight constriction. There are the usual three 

 lateral pairs of parenchimatous bands, terminating anteriorly in three pairs of 

 papillae. 



The buccal cavity is similar in shape to that of D. minutus and is 0*21 mm. in 

 depth. The oesophagus is en massue and measures 0*5 mm. in length and 0*22 mm. in 

 maximum thickness. The nerve-ring surrounds the oesophagus at 035 mm. from 

 the anterior end of the body. The excretory pore opens at o - 4 mm. from the head. 



The vulva is situated in the posterior half of the body, dividing the latter in the 

 ratio of io - 5 : 7. Its lips are modified into a papilliform process, the actual opening 

 being on the summit of the papilla. This "papilla" is smaller than in the preceding- 

 species, measuring 0^095 X 0*085 mm. There is a short transverse vagina, at right 

 angles to which the well-developed anterior and posterior ovejectors are given 

 off. 



The eggs in the uterus are unsegmented and measure o - o8oxcro48 mm. The 

 anus is situated at o - 72-o*75 mm. from the tip of the tail, which is drawn out to an 

 acute point. 



Discovery of the males may prove that this species and the foregoing are identi- 

 cal. The differences observed in the single specimen from the cobra are too slight to 

 warrant definite separation. 



Family ANCYLOSTOMIDAE, Looss, 1911. 



Subfamily ANCYL08T0MINAE, Looss, 1905, emend. Lane, 1917. 



Genus Ancylostoma (Dubini, 1843) Creplin, 1845. 



The collection contains all the species of this genus known to occur in India. 

 These are fairly well-known, and we propose only to give lists of the hosts from which 

 they were collected, with brief comments where necessary. 



Ancylostoma duodenale (Dubini, 1843). 



Hosts : 



Tiger {Felis tigris). 



Fishing cat (Felis viverrina). 



Lane (1917 b) has given an account of the occurrence of this species in the tiger. 

 He observed that the specimens, though mature, were somewhat stunted in size, 

 which may be an indication that the worm, now occurring mainly as a human para- 

 site, finds the conditions of living in the tiger adverse to the attainment of its full 

 size. The same failure to reach the normal size is observable in the material in the 

 present collection. From the tiger there are several specimens of both sexes; from 

 the fishing cat only a single female. The fact that this species can live in wild 

 Felidae indicates that it may eventually be discovered in the domestic cat (cf. A. 

 caninum and A. ceylanicum). 



