110 MR. G. NEVILL ON THE [Feb. 1 7, 



allied to H. nemoralis, H. vjilliamsiana, and other undoubted species 

 of Tachea, but shows great affinities to H. pareliana, of which it 

 might almost be described as a miniature form, while U. adesima is 

 a depressed form with peculiar aperture, more vivid coloration, and 

 umbiHcus scarcely covered with the columellar callosity, and H. ben- 

 neti is a dwarf convex form with small aperture. 



Type, Indian Museum, Calcutta ; also in collection of MM. Bour- 

 guignat and Coombe "Williams. 



Helix (Tachea?) cedesima, n. sp. 



Testa ad prcEcedentem peraffinis, sicut H. lucasi, Deshayes, ad H. 

 lacteam, Muller : imperforata, aut plus minusve subrimata, de- 

 presso-globosa, sat fragilis ; obsolete mulleata et subregulariter 

 striata, striis delicatis obliquis ; albida, zonulis variis circum- 

 cincta ; spira depressa, parum elevata, ultimo anfractu paululum 

 compresso, lente descendente, subtus ad regionem columellarem 

 paululum excavato ; apertura obliqua, trarisverse oblonga, superne 

 contracta, marginibus callo brunneo junctis ; peristoma vivide 

 coloratum, superne subrecte productum, pergradatim rotundatum, 

 ad basim abrupte angulatum, ac tuberculo subobsoleto munitum ; 

 margine columellari perobliquo, contortulo, subrtigoso, locum um- 

 bilicalem callo tetiui vix tegente. 



Diam. 27|, alt. 9 ; apert. lat. 15^, alt. 1.31 millim. 



Type, from deposit F, Indian Museum, Calcutta; also in collec- 

 tion J. R. Bourguignat. 



Var. COLORATA, nov. 



Yarietas major, sat tenuis, scepe subrimata, vix malleata, zonulis 



latis ac continuis ornata. 

 Diam. 31^; apert. lat. 18|^, alt. 16 millim. 



Type var., from deposit D, Indian Museum ; also in collection of 

 Coombe Williams. 



Var. cRAssiOR, nov. 



Varietas major, solidior, imperforata, valde malleata, ordinarie 

 zonula unica circumcincta, apertura minus contracta, margine 

 externo magis rotundato. 



Diam. 32, alt. 21 ; apert. lat. 19, alt. 16g millim. 



Type var. from deposit E, Indian Museum, Calcutta ; also in 

 collection Bourguignat and Coombe Williams. 



This is a very remarkable form, bearing much the same relation- 

 ship to H. mentonica as H. lucasi to H. lactea. It is much more de- 

 pressed, with a remarkable aperture, the columella (much twisted 

 and with a small tubercle at base) being bent inwards, so as to con- 

 tract the body portion of the aperture ; the external margin is 

 straightly produced, very gradually rounded, in this differing from 

 every other species of Tachea I know (H, mentonica, H. william- 

 siana, II. nemoralis, &c.), in all of which it is more or less rapidly 

 rounded. Unfortunately, though I found a great number of spe- 



