252 



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



SO formed (PI. II. fig 6). The male lias well-developed caudal 

 alse (PI. II. figs. 8 & 9), tlie lateral papilhie being correspond- 

 ingly buried. The ventral papillae are stalked and cup-shaped 

 or forked at their ends. The lateral papilhe are more widely 

 separated than those of the genotype. The spicules are orna- 

 mented with granulations tending to arrange themselves in 



Text-figure 4. 



1 



Spiroxys gangetica. Tail of female : a, ventral view ; h, lateral view; 

 c, lateral view of tip, at a higher magnification, to show the " notch." 



Text-figure 5. Text-figure 6. 



Text-fig. 5. — Spiroxys gavgetica. Female genital organs. 

 Text-tig. 6. — Spiroxgs gangetica. Ovum. 



transverse rows, and each has a blunt tip surmounted by a clear 

 chitinous cap (PI. II. fig. 10). 



In the female the tail is relatively more slender than in the 

 genotype both in later;il and in ventral views, while the notch 

 near its tip and the hook formed by it are particularly delicate 

 (text-fig. 4,c). The generative oi'gans (text-fig. 5)and eggs(text- 

 fig. 6) are of the generic type. 



