MOLLUSCA or IXDIA. 251 



Centre and admedians of usual form ; tlie 13tli tooth has a 

 narrower basal plate and a small cusp low down on the outside ; 

 the 14tli tooth has a cusp well below the main point; the mar- 

 ginals are all evetily bicuspid, becoming very minute on tlie extreme 

 edge. Thus differing from the radula of a very similar shell, but 

 having a striated surface, in which the marginals are very unevenly 

 bicuspid, viz. 31. politida (Plate CXX. 6g. 3 d). 



Macrochlamts vesica, var. (Plate CXXI. fig. 2.) 



Locality. Nemotha Trigonometrical Station, 3,300 ft. (J. Wood- 

 Mason), tx Indian Museum, Calcutta. 



The animal in spirit was mottled green and black. The shell is 

 quite smooth, rich amber-colour ; whorls 5|, increasing very 

 regularly, the columellar margin is subvertical. 



Size : maj. diam. lo-Q ; alt. axis 6-0 mm. 



This shell from Cachar, very close to M. vesica, differs materi- 

 ally in form from those of the typical locality, 70 miles further to 

 the west, compare fig. 2 with those in Plate CXVIII. figs. 2, 3, 4, 

 and 5. Absolute similarity is not to be expected over so large an 

 area and where climatic conditions are so variable. There being 

 only a single specimen, I have not thought it advisable in this 

 instance to give the shell a name. It differs sufficiently from 

 M. vesica to figure and briefly describe it. 



Maceochlamys sylhetensis, n. sp. (Plate CXXIII. fig. 9, 

 type.) 



Locality. Southern Hills of Sylhet (TF. Chennell). 



Shell narrowly perforate, very flatly globose, subaugulate on the 

 periphery ; sculpture none, a smooth glassy surface, only crossed 

 by tine transversal lines of growth ; colour dull oehraceous with a 

 grey tint; spire low, small, apex blunt; suture impressed; whorls 

 5, the last rapidly increasing, and the largest, apical whorls closely 

 wound ; aperture widely and depressedly lunate, suboblique ; 

 peristome thin ; columellar margin very oblique, not thickened, 

 and a very slight reflection. 



Size : maj. diam. fS'O, min. 14-0 ; alt. axis 6-0 mm. 



Only one specimen fouud, but that is of so striking a form that 

 I do not hesitate to describe it, as the species could so easily be 

 identified when rediscovered. 



Maceochlamys teeminus, G.-A. (Plate CXXVIII. fig. 5.) 



Macrnchlamys terminus, (x.-A. Moll. Ind, ii. pp. 134, 136, pi. xciv. 

 figs. 3, 3 rt (spermatophore) (1899). 



Paun. Brit. lud., Moll. (1908) p. 106, described as follows :— 



" Hah. Brahmakund, Eastern Assam ; Singpho ; Naga and 

 N. Cachar Hills. 



" Shell perforate, depressed, thin, smooth, polished ; spire very 



