342 Mr. G. Nevill on a new Species o/"Acme. 



Type, Indian Museum, Calcutta; also in coll. Marquis de 

 Folin, Mons. J. Rene" Bourguignat, Coombe Williams, P. 

 Joly, P. Fagot, and Colonel Godwin-Austen. 



Var. emaciata, nov. 



This is a dwarf form, apparently varying in every spe- 

 cimen, and of which it seems to me impossible to grasp 

 any thoroughly constant character. Taking an extreme spe- 

 cimen, it is distinguished by its smaller size, by the more 

 regularly turreted spire being quite upright, 6 whorls, of 

 almost equal size, slightly more convex, especially the last, 

 which is also proportionally very short ; aperture smaller, a 

 trifle more vertical and scarcely everted ; callosity joining- 

 margins well developed ; peristome does not present the 

 duplex appearance of the preceding, except at the columella. 

 Rare in middle deposit only. 



Long. 4*13, diam. (vix) 1"5 millim. 



Type var., Indian Museum, Calcutta ; also in coll. Marquis 

 de Folin and Mons. J. Rene" Bourguignat. 



Var. pachystoma, nov. 

 (An potius A. pachystoma, sp. nov. ?) 



This, unlike the preceding, is an exceedingly well-marked 

 and distinct form, unmistakable at a glance. I think it ex- 

 tremely probable Mons. Bourguignat is correct in regarding 

 it as a distinct species. It can be known from the typical 

 form by its much less distinct suture, by the shorter, less 

 elegantly and regularly turreted spine, composed of only six 

 more rapidly imcreasing whorls, the apical two compressed, 

 the others scarcely convex, almost cylindrical, especially the 

 last, which is proportionally much longer, the antepenulti- 

 mate one much broader than the others (not the case in type 

 form) ; the apical portion of the spire considerably more 

 diverted from the axis of the shell, with the aperture very 

 much everted, imparting a still stronger resemblance to cer- 

 tain species of Eulima ; the thick, white peristome is sur- 

 rounded by a still more callous rib, especially noticeable at its 

 termination, about the middle of the columella, which is 

 slightly oblique ; the duplex character of this outer lip is still 

 more distinctly and clearly marked. This form was by no 

 means uncommon, though much less abundant than typical 

 A. Foliniana, with which it was associated. 



Long. 5, diam. 1*9 millim. 



Type var., Indian Museum, Calcutta ; also in coll. Marquis 

 de Folin and Mons. J. Rene' Bourguignat. 



