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Show 1888.] MOLLUSCA FROM B U R M A H . 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 ; spire low, apex rounded ; suture shallow ; whorls 3, the last ample and convex on periphery ; aperture nearly circular ; peristome thin, a strong callus on the body-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. 18'0, min. 1375, alt. axis 6*8, body-whorl ll'O m m. Animal not seen. It would be an interesting species to obtain alive. This is one of those forms which, without an examination of the animal, it is quite impossible to assign to its true generic or sub-generic position ; it may be Cryptosoma 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 3|; aperture ovate, very oblique, very slightly descending at the peristome, this is thin, sinuate above; columellar margin oblique, reflected near the umbilicus. Size : maj. diam. 8*2, min. 7*0, alt. axis 4 m m. 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 in the present genus. The distinct umbilication is quite unlike any shell of this type I have seen. It has somewhat the outline of Cryptosoma 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 specimens from the Moole-it range, Tenasserim, described and figured by me in 'Land and Freshwater Moll. Ind.' p. 110, the only difference being in its ruddy-brown colour, the more southern form being olivaceous ochre ; coloration is very variable. 4. HEMIPLECTA? ZIMMAYENSIS, n. sp. Locality. Zimme, Siam territory (coll. Godwin-Austen, type). Shell globosely turbinate, well umbilicated, solid ; sculpture wavy broken longitudinal ribbing, crossed by the transverse litres of growth ; colour pale umber-brown, merging into white on tbe periphery and underside; spire subcorneal, apex blunt; suture impressed; whorls |
