HELICID^. 881 



Museum from Penang, Shanghai, and Thyet-Myo; specimens from Mauritius, 

 Bourbon, Seychelles, and Brazil differ slightly, but most certainly belong to one and 

 the same species. 



Axis max. 9i, diam. max. 16J (apert. alt. 8J, diam. 8J mm.) 



Helix (Borcasia) bolus, Bens. 



Helix lolus, Bens., Ann. and Mag. Nat. Hist., ser. 2, vol. xviii, 1856, p. 252. 



Helix tourannensis, Soul., Voy. Bonite., pi. xxix, figs. 1, 2 ; Con. Indica, pi. xxiii, fig. 7. 



Helix (Borcasia) iolus, Nevill, I. c, p. 22. 



Br. Anderson found this species very abundant at Pagan, Upper Burma, and 

 at Ponsee and Sanda, in Yunnan ; typical specimens from Prome are exactly similar ; 

 specimens of var. tourannensist from Cochin China, only differ by the spire being 

 slightly more raised. 



Helix (Borcasia) zoro aster, Theob. 



Helix Zoroaster, Theob., Journ. As. Soc, Bengal, vol. xxviii, 1859, p. 310; Con. Indica, pi. Ixxxvi 



figs. 2, 3. 

 Helix (Dorcasia) zoroaster, Nevill, I. c, p. 22. 



This species can be constantly distinguished from S. similaris by its larger and 

 more depressed form, by the considerably more open umbilicus, the more angulate 

 last whorl, and the more produced aperture, the columellar margin of which is much 

 more oblique. It was found abundantly at Prome, Thyet-Myo, Pagan, Tsagain, 

 and Manwyne. 



Axis max. 9 J, diam. max. 18 J mil. (apert. alt. 9, diam. 10 mm). 



Helix (Borcasia) scalptitrita, Bens. 



Helix scalpturita, Bens., Ann. and Mag. Nat. Hist., ser. 3, 1859, vol. iii^ p. 391 ; Con. Indica, pi. liii, 



fig. 9. 

 Helix {Borcasia) scal^turita, Nevill, I. c, p. 22. 



This fine species was found abundantly at Tsagain, Ava, Mandalay, and 2nd 

 Befile, Irawady ; it can be distinguished from both the preceding species by the 

 rounded whorls and raised spire and by the height of the aperture ; the brown band 

 is almost always very distinct and richly coloured, in one or two specimens only is 

 it obsolete. Though undoubtedly this and the two preceding forms are most closely 

 connected, I consider all three at present as well-estabHshed species. 



Axis. max. 13, diam. max. 21^ mil. (apert. alt. 11, diam. llf mm). 



p 5 



