222 HELICID^E. 



its more exserted spire and much narrower umbilicus, and in the 

 shape of the aperture, which is much more open and circular in 

 that species." (Preston.} 



"Major diam. 12, min. 10 mm. ; alt. 10 mm. Apert. alt. 4'25, 

 diam. 3-5 mm. (type)." 



Hob. India : Naga Hills. 



" The series of this shell which I have before me varies con- 

 siderably in diameter." (Preston.} 



The foregoing meagre description may be supplemented from 

 the type in the British Museum as follows : 



Shell depressed trochoid, light corneous, finely and rather 

 regularly striated, the upper side in places covered with excessively 

 minute spiral striae, more distinct on the lower side. Apex 

 obtuse, spire depressed, suture deep. Whorls 6, increasing 

 slowly and regularly, slightly convex, obscurely angulated at the 

 periphery, somewhat flattened below and obscurely angulated 

 around the umbilicus, last whorl dilated towards the mouth, 

 shortly descending in front. Aperture ovate-rotundate, oblique, 

 peristome white, slightly thickened, shortly reflexed ; margins 

 approaching, columellar slightly dilated. Umbilicus wide, per- 

 spective. 



jEgista mitanensis is proportionately much higher in the axis 

 and the umbilicus, consequently, is more contracted ; it has the 

 periphery keeled and is darker in colour. The measurements of the 

 type of JEgista congener, including the peristome, are as follows : 

 major diam. 11, minor 10, alt. 6 mm. 



194. JEgista coeni, Preston. 



jEgista coeni, Preston, Proc. Malac. Soc. London, xi, 1914, p. 19, 

 text-figure. 



Original description : " Shell broadly turbinate, dark reddish 

 brown ; whorls 6, regularly increasing, not very convex, marked 

 with closely-set, oblique growth striae ; base of shell also marked 

 with lines of growth and very finely spirally striate ; suture well 

 marked ; umbilicus wide and deep ; columella whitish, diaphanous, 

 rather broadly expanded above, obliquely descending ; labrum not 

 thickened, narrowly reflexed ; aperture obliquely subcircular." 

 (Preston.} 



Maj. diam. 9'5, min. 8*25 mm. ; alt. 6 mm. 



Hob. India : Naga Hills. 



Genus VALLONIA, Risso. 



Vallonia, Risso, Hist. Nat. EuropemSrid. iv, 1826, p. 101 ; Westerlund, 

 Fauna Palaarct. Binnenconch. i, 1889, pp. 2, 14 ; Sterki, Proc. 

 Acad. Nat. Sci. Philadelphia, 1893, p. 234 (jaw and dentition) ; 



