402 LAXD AXD FRESHWATER 



Size : maj. diara. 4-2 ; alt. axis 2-0 mm. 



This Diyung Valley species is a departure from A. tlieohaldi of 

 the Khasi Hills in having the apex less high and conical, the suture 

 more impressed, the shell more openly umbilicated; costulation 

 next suture stronger. I collected a dozen specimens, 



Altc^tjs (Dioetx) ttrxula, var. anghamtensis. Type. No. 

 2530 G.-A. Coll. (Plate CLIII. figs. 6, 6 a.) 



Locality. Japvo Peak, Naga Hills, 9890 ft. ( Godtvin-Aristen). 



Shell very globosely conoid, imperforate, with strong epidermis ; 

 sculpture smooth, with distant strong striation approaching irregular 

 distant costulation ; fine close costulation as far back as end of the 

 sutural tube ; colour pale sienna-brown, apex darker ; spire sub- 

 conic, low ; apex blunt ; suture impressed, the sutural tube very 

 long ; whorls 4, much rounded ; aperture circular, vertical ; peri- 

 stome compactly double. 



Size : maj. diam. 4"1 ; alt. axis 2-9 mm. 



Other specimens were found in the Anghami-Naga Hills 

 (IS^o. 2o29 P.M., figured on Plate CLIII. figs, o, 5 a). This is very 

 distinct from tyj)ical D. unmla in its globose, tumid shape. From 

 the Lhota Naga Hills, there are five specimens (No. 2G03 P.M.) 

 which come very close to this variety, yet are not quite the same, 

 and one is very large, 4*5 mm. in major diameter and 6 mm. in 

 height. 



Alxc^tts (Dioeyx) tjrnula, var. pistjm. No. 2528 P.M. 



Locality. Jatinga Valley, North Cachar. 



Similar in every respect to the typical shells from Marangsip Peak 

 in the South Jaintia Hills. One larger than the others is 4 mm. 

 in major diameter. 



Altc^us (Dioeyx) varius, n. sp. (Plate CLVII. figs. 7, 7 «.) 

 No. 2574 P.M. 



Locality. Lhota Naga Hills (A. Chennell). 



Shell turbinate, narrowly perforate ; sculpture : transverse stria- 

 tion above, finely costulated next the sutural ttibe ; colour bleached; 

 spire rather high, apex fine ; suture impressed, sutural tube long ; 

 whorls 4, rounded, slightly swollen near sutural tube, constriction 

 near base of it and at some distance from the peristome, interval 

 smooth and straight ; aperture circular, subvertical ; perititome 

 double, solid, thickened on outer margin, not so on the columellar 

 margin. 



Size : maj. diam. 4-0 ; alt. axis 2"5 mm. 



This is an interesting form, but unfortunately only one specimen 

 was found. The long sutural tube and the sliort distance it is 

 behind the peristome places it in Diory.v, but it differs very much 

 in the umbilical region and in general shape. 



