282 



Memoirs of the Indian Museum. 



[Vol. VII, 



Contracaecum rosarium (Connal, 1912). 



(Fig. 16.) 



The collection contains worms taken on two occasions from the night- heron 

 (Nycticorax griseus). The material consists in one case of two immature males, the 

 tails of which are eroded and useless for purposes of identification, and in the other 

 case of three immature females and one rather damaged, immature male. We have 



o-L mm,. 



Fig. 16. — Contracaecum rosarium. Tail of male ; ventral view. 



assigned these to Contracaecum, rosarium. There is nothing in Connal' s (1912) de- 

 scription to indicate a difference between his species and C. microcephalum (Rud.), 

 except that there are three pairs of postanal papillae in the male. With the material 

 at our disposal it is not possible to redescribe the species. The head generally and 

 the dorsal lip in particular are indistinguishable from those of C. microcephalum. 

 However, the tail of the male in the second set shows quite clearly that there are 

 more than three pairs of postanal papillae, and that the number and arrangement of 

 these papillae (which, in the only specimen available, are unfortunately somewhat 

 asymmetrical), will serve to differentiate this species from C. microcephalum. There 

 are nine pairs of postanal papillae. Those of the pair at the tip are stalked and 

 nipple-like, while the remainder are flattened. The fifth pair have double termina- 

 tions. 



Our best thanks are due to Dr. L. Gedoelst, of Brussels, for kindly obtaining for us the loan of 

 the type-material of Kathleena arcuata, Gedoelst, 1916, the property of the Congo Museum atTervueren. 

 One of us (Baylis, 1920 a) had already suggested that this form was probably identical with Contra- 

 caecum microcephalum (Rud.). and our examination of the material confirms this view. 



Contracaecum incurvum (Rud., 1819) (?). 



Syn. Ascaris incurva, Rud. 



(Figs. 17, 18.) 

 Two male individuals of an Ascarid from the stomach of the peacock fish 

 {Histiophorus gladius) are probably referable to this species, though they are small 

 and perhaps not fully mature. The characters of the oesophagus and of the head 



