ALYCEUS. 241 



pitted and with little or no costulation towards the apex. 



These ilifferences were i'ound constant iu 2o specimens 

 received." {Godivin- Austen.) 



359. Aly casus crenatus, Godivin- Austen. 



A/i/creus crenatus, Godwin-Austen, J. A. S. B. xl, part 2, 1871, 

 p. 90, pi. 3, tigs. 5, 6 a, 5 b ; id., op. cit. xliii, part 2, 1874, p. 150 ; 

 rianley &. Theobald, Conch. Ind. 1875, pi. 103, tifrs. 2,3; I'leiffer, 

 Mon. Pneuiu. 8uppl. 3, 187(>, p. 390 ; Theobald, Cat. Shells Brit. 

 India, 187t), p. 39; 8owerby, in Iteeve, Conch. Icon, xx, 1877, 

 Alyaens, pi. 1, tigs. la,\h ; Xevill, Hand List, i, 1878, p. 291 ; 

 Godwin-Austen, Land & Freshw. Moll. India, ii, 1914, p. 388, 

 pi. 143, tigs. 8, 8a, ^h. 



Alycaeus (C/iarax) crcnatidf, Kobelt & MiillendortF, Nachr. Deuts. 

 Malak. Ges. xxix, 1897, p. 152 ; id.. Cat. Pneum. 1899, p. 48. 



Alt/caeii'< (Dicharax) crenatus, Kobelt, Das Tierreich, Lief. 10, 1902, 

 p. 366. 



Orlijinal description : — " Shell moderately umhilicated, de- 

 pressedly turbinate, rather thin, translucent, pale horny or white, 

 epidermis of former colour, peeling ofi' in old shells, with very 

 line indistinct costulation throughout, fine close ribbing on the 

 swell of the last whorl. Spire depressedly conoid, apex very blunt, 

 suture well impressed. AV^horls 4, rounded, the last moderately 

 swollen, constricted close to the base of the sutural tube, with a 

 marked subvertical ridge just behind the mouth. Constriction 

 smooth, sutural tube long, rather thick ; aperture oblique ; 

 peristome round, deeply waved on the upper and outer but not 

 on the coluiiiellar margin, outer lip small, slightly expanded. 

 Operculum multispiral, concave in front, with a small projecting 

 boss at the back. Animal pale coloured, tentacles dark 

 brown. 



"Major diam. 0-18" [4-5 mm.] ; minor diam. 0-16' [4 mm.] ; 

 alt. O'll'' [2'75 mm.] ; diam. of aperture 0-08" [2 mm.]; sutural 

 tube 0-075" [1-9 mm.]." 



Ilab. India: Mokarsa, jS'.AV. Khasi Hills; ilengdon Peak, 

 Burrail Range, Xortli Cachar, 5000 ft ; Latinga and Diyung 

 Valleys; Lhota-Naga Hills {Godivin- Austen). 



" Near A. plectocheilus, but much larger, the ridge more distant 

 from the peristome and the latter more expanded. In some 

 specimens the edges of the outer whorls iu the operculum are 

 much raised and bent inwards as iu Gyuthopoma. 



'' Xo appreciable difference cau be found between the western 

 and eastern shells, one only, that in the latter the last whorl 

 behind the aperture and within the umbilicus is more rounded — 

 in the western there is a decided keel. From the Lhota- 

 Naga Hills, one e.\ample must be considered a variety ; it is 

 closer wound with closer umbilicus and whorl subangulate 

 near it." {Godwin-Austen.) 



