1922.] 



H. A. Baylis and R. Daubney : Parasitic Nematodes. 



307 



constriction between the two swellings. Its length is 0*6-0*67 mm., and the diameter 

 of the posterior swelling 0-45-0-47 mm. The prominent, almost bristle-like, cervical 

 papillae are situated at 1*3-1-4 mm., the nerve-ring at 0*45-0-5 mm., and the 

 excretory pore at 2*0-2*15 mm., from the anterior end. 



The tail of the male (fig. 42) measures 0-7-0-85 mm. in length. There is no pre- 

 anal sucker-like organ. The number and arrangement of the papillae are the same as 

 in the preceding species (F. barbi) — there being ten pairs and a median preanal papilla. 

 The spicules are about 1 mm. long and 0*09 mm. wide. There appears to be no chi- 

 tinized accessory piece. 



In the female the tail is 1*1-1*3 mm. long. The caudal papillae are very incon- 

 spicuous, and are situated at o - 6 mm. from the tip. The vulva is at about 11 mm. 

 from the posterior end. The vagina is narrow, and apparently short, but its 

 course is difficult to trace owing to the dense masses of ova in the uterus. It 

 runs forward and dorsally from the vulva, keeping close to the body-wall. The 

 branches of the uterus are wide, nearly filling the body-cavity. The ova are very 

 much more numerous and considerably smaller than in most of the other species, 

 and of a much more spherical shajDe. They measure 0-075x0-055 mm., and their 

 contents appear to be unsegmented at the time of laying. 



Falcaustra stewarti, sp. nov. 



(Figs. 43, 44.) 

 Hosts and localities : 



Kachuga smithii ; Ferozpore, Punjab. 

 Hardella thurgi ; Siripur, Saran, Bihar. 



This is a species of moderate size, differing from the typical forms in having a 

 larger number of caudal papillae in the male, and in other features. In the material 

 from Kachuga smithii, which we take as 

 typical, the length of the male is 17-19 -8 

 mm., that of the female 19-22-6 mm. 

 The greatest thickness is 0-6-0-7 mm. in 

 the male; 0-65-0-75 mm. in the female. 

 The cuticular striation is exceedingly fine. 

 The head has a diameter of 0-19-0-21 

 mm., and is followed immediately by a 

 slightly narrower neck. The buccal 

 cavity is very shallow, measuring only 

 0"o6mm. in length. A distinct pharynx 

 is present, 0-09 mm. long. The total 

 length of the oesophagus is 2-1-2-5 mm. 

 The bulb has no marked constriction, and 

 measures 0*5-0-55 mm. in length and 

 0-3-0-32 mm. in diameter. The small, 

 but very prominent, cervical papillae are at 1*3-1-37 mm., the nerve-ring at o*5-*o*6 



Fig. 43. — ■ Falcaustra stewarti. Head of female 

 from Hardella thurgi ; dorsal view. 



c, cuticular ring; p., forked pulp of papillae; 

 ph., pharynx. 



