286 ZONITIDiE. 



[453. SopMna calias, B^. (Ilelix) A. M. N. H. (3) iii, 1859, p. 472 ; 



id. op. cit. (8) V, 1860, p. 26; Pfr. (Helix) Mo>«. Hel. v, 1868, 



p. 112 ; H. 8r T. C. I. 1876, pi. 147, figs. 2, 3 ; Nevill, Nanina 



(Sopliina) Hand-l. i, 1878, p. 52. 

 Sophina discoidalis, Stol. J. A. S. B. 1871, 2, p. 258, pi. 19, figs. 5, 



11, 12; lyr. Helix (Sopliina), Mo7i. Hel. vii, 1876, p. 117; 



H. S,' T. C. I. 1876, pi. 147, fig. 7 ; Nevill, Hmid-l. i, 1878, p. 52 

 Sopliina scliistostelis, Bs. (Helix) A. M. N. H. (3) iii, 1859, p. 473 



(3) V, 1860, p. 27 ; Pfr. (Helix) Mon. Hel. v, 1868, p. iii ; id. 



t. c. Tii. 1876, p. 116; H. S>- T. C. I. 1876, pi. 147, figs. 5, 6 



Nevill, Nanina (Sophina), Hnnd-l. i, 1878, p. 52. 

 Sophina calias, Stol. J. A. S. B. 1871, 2, p. 225, pi. 19, figs. 1-4 & 



7-9 (anatomy and shell). 

 Fig. 87, A, A'. 



Shell narrowly umbilicated, depressedly orbiculate,solid,obliquely 

 striated, pale horny; spire flat, apex slightly raised, obtuse, suture 

 marginate ; whorls 5, convex, moderately increasing, the last 

 rounded at the circumference, below slightly convex ; aperture 

 broadly lunate, suboblique ; peristome sti-aight, acute, the colu- 

 mellar margin obHquely descending, thickened, slightly reflected, 

 at base narrowly notched, extremity o£ notch keeled umbilicately, 

 forming a gradual spiral receding within the narrow umbilicus. 

 Large species : major diam. 15, min. 13-5, alt. axis 6 mm. 

 Ordinary size : ,, „ 9, „ 7"5, „ „ 4 ,, 

 Eah. Near Moulmein at the Farm Caves and Tavoy {Theobald) , 

 The specimens from Tavoy are very solid and milky white in 

 colour. The adult shell always shows two periods of growth, the 

 position of the old aperture showing as a varix on the last 

 whorl.] 



[454. Sophina schistostelis, Bs. (Helix) A. M. N. H. (3) iii, 1859, 



p. 473, (3) v. 1860, p. 27; Pfr. (Helix) Mon. Hel. v, 1868, p. Ill; 



id. t. c. vii, 1876, p. 116 ; H. 4- T. (Sophina) C. I. 1876, pi. 147, 



fiffs. 5, 6; Nevill, Nanina (Sophina), Hand-l. \, 1878, p. 52. 



Sophina calias, Stol. J. A. S. B. 1871, 2, p. 225, pi. 19, figs. 1-4 & 



7-9 (anatomv and shell). 

 Vide fig. 86, p.' 283 ; tig. 87, B, B'. 



Shell perforate, globosely depressed, thin, smooth, irregularly 

 transversely striate, translucent, shiny, pale horny ; spire short, 

 apex slightly elevated, obtuse, suture impressed and marginate ; 

 whorls 4;i-5|, above and below sKghtly convex, rounded on the 

 last ; apertur'e subrotundately lunate ; peristome thin, straight ; 

 columellar margin vertical, thickened slightly, forming with the 

 basal margin of the peristome a deep notch or cleft, compressed 

 into a sharp keel round the umbilicus and retreating within it. 



Specimen described: major diam. 16, min. 13-5, axis 8-5 mm. 

 (Specimen described by Benson.) 



Hah. Near Moulmein. 



This species can be determined at once by the deep cleft, which 

 is longer and deeper than in any other species of the genus.] 



