256 LAXJJ AXD FRESU\VATER 



corneous; spire moderately high, apex rounded; suture adpressed, 

 well defined ; whorls 6, closely and regularly wound, the last 

 rounded, not swollen below ; aperture lunate, suboblique ; peri- 

 stome thin, sinuate both on upper and lower margin, very 

 obhquely descending on the columellar margin, but slightly 

 reflected yet covering completely the umbilicus. 



mm. mm. mm. 



Size: maj. diam.... 11"5 min. diam. 105 alt. axis . ,5'0 



alt. body-whorl 41) alt. ap. . . 5'0 diam. ap. . . 6"0 



Mr. Chennell collected a number o£ this species in the above 

 Hills. Though very like at first glance to young 31. atricolor, its 

 more closely wound whorls distinguish it at once. 



The animal of this specimen was dissected. The right shell-lobe 

 was rather short and tongue-sliaped, and there was the usual 

 small left shell-lobe. A spermatophore (Plate CXXII. fig. 3) \\ as 

 in a good state of preservation. It has a long flume, with elon- 

 gate spines on cue side only, each terminating in a bifid point; 

 they only extend about halfway towards the capsule, close to this 

 ai-e four thicker spines set close together. 



The radula (Plate CXXIX. fig. 8) has long pointed centrals of 

 usual form, cusps on outer margin, basal two transitional teeth 

 very much narrower, the admedians evenly bicuspid, arranged 



56 . 2 . 10 . 1 . 10 . 2 . 56 

 or 68 . 1 . 68 



in 110 rows. Jaw has a central projection. 



Macrochlamts sufflata, n. sp. (Plate CXIX, fig. 9, shell ; 

 Plate CXXII. figs. 2-2 c, anatomy.) 



Locality. Eastern Burrail Eange (Godtvin- Austen). Xo. 519 

 B.M. Coll. 



Animal. Has a small tongue-shaped right shell-lobe. The 

 genitalia (fig. 2) are on the plan of typical Macrochlamys, the male 

 organ having a small coiled csecum near the retractor muscle 

 attachment (figs. 2 a and 2 h). Amatorial organ large. Jaw has a 

 central projection (fig. 2 c), and is well arched above. 



Macrochlamts stjfflata, n. sp. (Dissected, shell not drawn.) 



Locality. Lhota Naga Hills (IF. Chennell). Xo. 523 B.M. Coll. 



Shell umbilicated, globosely conoid, thin, transparent, glassy ; 

 sculpture none, surface quite smooth ; colour pale greenish horny ; 

 spire rather high, apex blunt ; suture impressed ; whorls 5, the last 

 well rounded and swollen below ; aperture rotiindately oval, sub- 

 vertical ; peristome thin, straight, subvertical on inner margin, 

 but slightly reflected. 



Size : inaj. diam. 10-5, min. 9-75 ; alt. axis 5-0 mm. 



