1888.] MOLLUSCA FROM BURMAH. 241 



There will be also included two or three shells in Mr. Theobald's 

 collection from this part of Burmah. 



1. AUSTENIA? KHYOUNGENSIS, n. Sp. 



Locality. Shan Hills. 



Shell globose, tumid, not umbilicated ; sculpture covered with an 

 epidermis, smooth ; colour brown, but the specimen with epidermis 

 still remaining is weathered, in life it is probably polished ; spiie luw, 

 apex rounded ; suture shallow ; whorls 3, the last ample and convex 

 on periphery ; aperture nearly circular ; peristome thin, a strong 

 callus on the bodv-whorl extending into the interior of the shell. 



Largest specimen. Size: maj. diam. 20*5, min. 12"0, alt. axis 9'0. 



Second specimen. Size: maj. diam. IS'O, min. 13'75, alt. axis 6*8, 

 body-whor! ll'O mm. 



Animal not seen. It would be an interesting species to obtain 

 alive. This is one of tiiose forms which, witliout an examination of 

 the animal, it is quite impossiljle to assign to its true generic or sub- 

 generic position ; it may be Cryptosuma or an Austenia. 



2. Austenia? erratica, n. sp. 



Locality. Pingoung, Shan Hills. 



Shell depressedly globose, narrowly umbilicated, solid for size ; 

 sculpture none, surface quite smooth ; colour white, shiny, but both 

 specimens are bleached ; it has evidently an epidermis when alive ; 

 spire flatly rounded, apex low ; suture adpressed ; whorls 3g ; 

 aperture ovate, very oblique, very slightly descending at the peri- 

 stome, this is thin, sinuate above ; columellar margin oblique, 

 reflected near the umbilicus. 



Size : maj. diam. 8"2, min. 7*0, alt. axis 4 mm. 



This shell was marked Durgella levicula by Mr. Ponsonby. It is 

 not of that species, which has a very thin and glassy shell, is much 

 more globose and with higher spire. I put it only provisionally iu 

 the present genus. The distinct umbilication is quite unlike any shell 

 of this type I have seen. It has somewhat the outline of Crypto- 

 soma prcestans in miniature, but it is not the young of that species, 

 with which 1 have compared it. 



3. Macrochlamys? consepta, Bs , small var. 



This shell agrees exactly in all its characters and size with speci- 

 mens from the Moole-it range, Tenasserim, described and figured by 

 me in 'Laud and Freshwater Moll. lud.' p. 110, the only difference 

 being in its ruddy-brown colour, the more southern form beii.g oliva- 

 ceous ochre ; coloration is very variable. 



4. Hemiplecta? zimmayensis, n. sp. 



Locality. Zimmo, Siam territory {coll. Godioin- Austen, type). 



Shell giobosely turbinate, well umbilicated, solid ; sculpture wavy 

 broken longitudinal ribbing, crossed by the transverse lines of growth ; 

 colour pale umber-brown, merging into white on tlie periphery and 

 underside ; spire subconical, apex blunt ; suture impressed ; wliorls 



