MOLLUSCA OF INDIA. 15 



DiPLOMMATiNA DOMTJNCULA, Godwiii-xiusten. (Plate LXVI. fig. 8.) 



Diplommatina domuncuhi, G.-A. P. Z. S. 1892, p. 518. 



Locality. Margarita, Naga Hills ( W. Dohertij, in coll. T. H. 

 Aldrich). 



Original description : — " Shell dextral, fusiform ; sculpture, 

 strong, regular, distant costulation on all the whorls, much closer 

 near the constriction, fi.rst two whorls smooth ; colour pale whitish 

 with an ochraceous tint ; spire with convex sides, apex blunt ; 

 suture well impressed ; whorls 7^, sides convex, antepenultimate 

 the largest, last whorl does not rise upon the penultimate ; con- 

 striction above the aperture ; aperture circular, subvertical, curvi- 

 linear as seen from tlie side ; peristome double, not very much 

 thickened ; columellar tooth very minute, internal. 



" Size : maj. diam. 1'3; alt. axis 3'0 mm. 



" This is a very distinct form, quite new to me, and belonging to 

 a group which is not represented, so far as I know, in the Khasi 

 and Jaintia Hills." 



DiPLOMMATiNA succiNEA, Godwin-Austen. (Plate LXVI. fig. 9.) 



Dijilommatina succinea, G.-A. P. Z. S. 1892, p. 519. 



Locality. Anghami Naga Hills (Godiuin- Austin). 



Original description : — " Shell dextral, tumidly fusiform, thin and 

 delicate in texture ; sculpture, regular, rather close costulation ; 

 colour very pale amber, with stronger coloration on the apex ; sjjire 

 somewhat depressed, suture impressed ; whorls 6, tumid, with 

 convex sides ; constriction above the aperture ; aperture oval, ver- 

 tical ; columellar tooth only indicated by a slight swelling ; peri- 

 stome double, strong. 



" Size : maj. diam. 1*3 ; alt. axis 2'0 mm. 



" This minute species may be compared with D. parvida from 

 the N. Khasi Hills, from which it differs in being larger, and in 

 having a greater number of whorls and a much more tumid shape." 



DiPLOMMATiNA ooNciNNA, Godwin- Austcu. (Plate LX"VI. fig. 10.) 



Diplommatina concinna, G.-A. P. Z. S. 1892, p. 519. 



Locality. Naga Hills, probably south of Margarita (Doherty, in 

 coll. T. H. Aldrich). 



Original description : — " Shell dextral, solid, fusiform ; sculpture, 

 very strong, rather distant costulation ; spire tapering rapidly, apex 

 acuminate ; suture impressed ; whorls 7, sides convex, penultimate 

 and antepenultimate about equal in size ; constriction hardly ap- 

 parent, just above the aperture ; aperture circular, vertical ; colu- 

 mellar tooth quite minute, only an indication of it ; peristome double, 

 strongly developed. 



" Size : alt. axis 1"6 mm. 



" This is very distinct from any of the minute species I have 

 hitherto examined from this part of India ; it is distinguished by 

 its thick shell and strong costulation." 



