1865.] Contributions to Indian Malacology. 83 



I also met with a shell apparently belonging to this species, bnt 

 not full grown, at Pyenia Khyoung, south of Bassein. 



An immature specimen of probably a 4th species of Lagocheilus, 

 with very fine and rather close equidistant spiral sculpture, was found 

 by me in the neighbourhood of Ava. 



Genus PTEROCYCLOS. 



25. Pt. Feddeni, n. sp. 



Shell widely umbilicated, convexly depressed, smooth, finely striated 



rather thin, elegantly marked with alternating transverse zigzag stripes 



of white and chesnut, and with a moderately broad submedian band of 



darker colour. Spire nearly flat ; apex but very slightly protruded ; 



suture deep. Whorls 4J, convex ; the last rounded, descending towards 



the mouth. Aperture circular, slightly oblique ; peristome double ; the 



two portions separated by a shallow groove, the inner cut away into a. 



moderate sinus above, and the outer turned up into a small vertical 



wing, free from the penultimate whorl. Operculum concave within, 



the centre flat ; flatly concave without, with lamellar free edges to the 



whorls, thickest at the circumference. 



Millem. inch. 



Major diameter, ,^ 11 0.44 



Minor ditto, 9 0.36 



Axis,... 5 0.2 



Habitat — Thayet Myo, Pegu — rare. 



A smaller and more convex shell than Pt. cetra, Bens, from 

 Molmein. It is one of the most beautifully marked species of the 

 genus ; it resembles Pt. jpullatus, Bens., in form, and in the peculiar 

 characters of the operculum, and equals the handsomest specimens of 

 Pt. rupestris, Bens., in its colouring. 



Named after the discoverer, Mr. Fedden, of the Geological Survey. 



Genus ALYC^US. 



26. A. folitus, n. sp. 



Shell moderately umbilicated, turbinately depressed, smooth, polish- 

 ed, shining, amber-coloured. Spire depressly conoidal ; suture deep ; 

 apex obtuse, rather redder than the remainder of the shell. Whorls 

 3J, convex ; the last round, scarcely descending towards the mouth 

 very little swollen at the side, and ornamented on the inflated portion 



