2G4 



MR. H. A. BAYLIS AND LT.-COL. CLAYTON LANE ON 



anterior end to form two parallel branches which also run 

 forward. 



At the opposite extreme we have observed cases (text-fig. 14; 

 where the vagina runs into a moie or less oblong, swollen 

 uterine sac, which gives ofi:' a single branch at its posterior end 

 and thi-ee branches side hy side anteriorly. Between these 

 extremes of variation there appear to be intermediate forms 

 (text-fig. 15) in which the point of origin of the first of the three 

 anterior branches shows a greater or less tendency to approach 

 that of the other two. The shape of the common uterine 

 chamber varies considerably. We are unable to recognize in 



Text-figure 15. 



I 1- 



Tanqua tiara. Female genital organs. (Young specimen from Nigeria.) 



these varieties in the form of the female oigans any of systematic 

 value, since we have found the same range of variation in 

 material from both Indian and African sources, and since the 

 extremes are, as has been stated, connected by intermediate 

 forms. 



Specific Diagnosis. 



Tanqua tiara (v. Linst.). 



Head-bulb divided in the adult into four swellings, each con- 

 taining a single ballonet. Head not retractile within the 

 cuticular collar. Yulva within the last quarter of the body. 

 L'terus with three anterior branches and one posterior. 



Habitat : stomach of semi-aquatic lizards (Varanid^e). 



For list of hosts, see p. 271. 



2. Tanqua ANOMALA * (v. Linst.. 1904). (Text-figs. 16-20; 

 PI. lY. fig. 14.) 



Heterakis anomala v. Linstow (1904 a, p. 97 ; pi. i. fifjs. 

 10-11). 



Tanqua anomala Baylis (1916, p. 229). 



T. tiara (in part) Baylis (1916, p. 223 ; text-fig. 2). 



Of this species we have now, through the kindness of Dr. 

 J. Pearson, of the Colombo Museum, had the opportunity of 



For specif.c diagnosis, see p. 268. 



