278 CYCLOPHORTD.B. 



approach to the more shortened C. r/ibbum, Fer., from Turon in 

 Cocliin China, and to the depressed O. stram/ulatum, Hutton, so 

 abundant in the more western portion of the HiniaLayas." {Benson.) 

 Benson in 1859 described a var. minor, but Lieut.-Col. Godwin- 

 Austen has shown * that tlie species varies considerably in size, 

 and he concludes that " there is no reason why a variety should 

 be constituted," a view in wliith I entirely concur. 



414. Alycseus costatus, Godwin- Austen. 



Ali/cceus [irapliicus var., Godwin- Austen, J. A.S. B. xlv, part 2, 



1876, p. 178 (part). 

 Ali/cd'ris {Cyclory ) costatus. Godwin-Austen, Land & Freshw. 



Moll. India, ii, 1914, p. 360, pi. 154, tigs. 2, 2 a. 



Ovi<jinal description : — " Shell narrowly perforate, elongately 

 conical; sculpture distant, well- raised costulation, continuous up 

 to the aperture, about 7 costte anterior to the shoi-t sutural tube ; 

 colour stony white, apex yellowy pink fading to ochraceous ; spire 

 high, sides flat, apex rather pointed ; suture impressed ; whorls 4, 

 well rounded ; aperture circular, vertical ; peristome double, 

 reflected. 



"Major diam. 2-75; alt. axis 2 mm.'' 



Hab. India : Dikrang Valley, Dafla Hills {Godwin- Axisten). 



" .... It is a close ally of A. {C'l/doryx) pauci costatus, but 

 is more elongate, spire not so pyramidal, and it is a smaller 

 shell. It approaches specimens . . . received from the Indian 

 Aluseum, Calcutta, as constrictus, var., but I consider them true 

 constrictus. . . . This Dafla shell is of a different, more elon- 

 gate shape, although the umbilical region is similar and perforate." 

 {Godv.nn-A^lsten.) 



415. Alycaeus difficilis, Godivin- Austen. 



Ahjcceus {Cycloryx) difficilis, Godwin-AusteH, Land & Freshw. 

 Moll. India, ii, 1914, p. 415, pi. 155, figs. 2, 2o. 



Orifjincd descri_pUon: — "Shell ovately globose, perforation 

 hidden; sculpture: distant well-marked costulation on the upper 

 whorls, much finer next the sutural tube and a little closer, no 

 costulation in front of it ; colour white, neither specimen very 

 fresh ; spire moderately high ; suture impressed, the tube very 

 short and small; whorls 4, well rounded, the last slightly swollen 

 in front of the sutural tube ; aperture circular ; peristome double, 

 inner circular, continuous, the outer with a strong flange-like 

 expansion on columellar margin, expanded and reflected on outer 

 and upper margin. 



" Major diam. 3-2; alt. axis 2-4 mm." 



Hcdj. Burma: Shan Hills (i'«?fZt;H). 



" There is considerable similarity in this species with that of 

 A. thompsoni, of Munipur, particularly in shape, but the Shan 



* Land and Freshw. Moll. India, ii, 1914, p. 348. 



