1922.] 



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



281 



lae, of which the second and third from the tip of the tail are laterally, the rest ven- 

 trally situated. The fifth papilla on either side is larger than the rest, and has double 

 terminations. The spicules are equal, simple and without alae. They measure only 

 0*9 mm. in length. 



The tail of the female is bluntly conical and measures 0^44 mm. in length. The 

 caudal papillae are situated at 0-162 mm. from the tip, The vulva is somewhat be- 



Fig. 14. — Porrocaecum pristis. 

 male : lateral view. 



Tail of 



Fig. 15. — Porrocaecum pristis. Tail of male; 

 ventral view. 



hind the anterior third of the body — at 123 mm. from the anterior end in a specimen 

 34*2 mm. long. The muscular vagina, which runs posteriorly, is very short (about 

 07 mm.), expanding in its posterior half to a diameter of 0-19 mm. This swollen 

 portion is packed with ova. Then follows a wide uterine reservoir, about 2 mm. long, 

 which gives off posteriorly the two uterine branches. These run almost straight to- 

 wards the posterior end. The posterior limit of the coils of the ovarian tubes is 

 about 1 "5 mm. from the posterior end. The ova are spherical, with a thin shell, 

 measuring 0*0475 mm. in diameter. The content of the egg is unsegmented when 

 ready for laying. 



Ascaris circularis v. Linst. is recorded as a parasite of Pristis antiquorum in the Cameroon. Von 

 Linstow (1907), in his description of it, mentions the presence of an intestinal caecum, and it is not 

 improbable that the species also belongs to the genus Porrocaecum. But the figure of the dorsal lip 

 (I. c, pi. 6, fig. 1) is sufficient to differentiate it from P. pristis. 



Genus Contracaecum, Railliet and Henry, 1912. 



Contracaecum spiculigerum (Rud., 1809). 

 Hosts : 



Little cormorant (Phalacro corax javanicus). 



Indian shag (Phalacrocorax fuscicollis) . 



