172 HELICID,?:. 



145. Chloritis delibrata, Benson. 



Helix delibratus, Benson, J. A. S. B. v, 1836, p. 352. 



Helix delibrata, Benson, A. M. N. H. ser. 2, ii, 1848, p. 162 ; 



Blanford, J.A. S. B. xxxiv, I860, p. 89 ; Hanley & Theobald, 



Conch. lud. 1870, pi. 14, fig. 10 ; Nevill in Anderson, Zool. 



Results Exp. W. Yunnan, i, 1878, p. 873. 

 Trachia delibrata, Stoliczka, J. A. S. B. xl, 1871, p. 225, pi. 16, 



figs. 1-3 (anatomy). 

 Helix {Planispira) delibrata, Nevill, Hand List, 1878, p. 76. 

 Helix {Trachia) delibrata, Tapparone Canefri, Ann. Mus. Civ. 



Genova, ser. 2, vii, 1889, p. 325. 

 Helix {Plectotrojns (Trachia)) delibrata, Tvvou, Mem. Conch, ser. 2, 



iv, 1888, p. 64, pi. 14, tig. 75. 

 Planispira {Trachia) delibrata, Pilsbry, Man. Conch, ser. 2, ix, 



1894, p. 116, pi. 32, figs. 44, 45 (anatomy). 

 Chloritis {Trichochloritis) delibrata, Gude, Proc. Malac. Soc. 



London, vii, 1906, p. 115. 



Shell discoid, rather widely urabilieated, thin, semi-transparent, 

 pale fuscous or ochraceous, finely striated, sliining under a velvety 

 cuticle, covered in the fresh condition with close-set stiff bristles 

 arranged in quincunx. Spire plane, apex depressed or immersed, 

 suture deep. Whorls 3:|-4, convex, subangulated around the 

 umbilicus, increasing rather suddenly, the last twice as wide as 

 the penultimate, slightly dilated towards the mouth, slightly 

 gibbous below behind the peristome, shortly and abruptly 

 descending in front. Aperture oblique, obovate-auriculate, 

 margins approaching; peristome white or pale fulvous, scarcely 

 thickened, reflexed ; upper margin ascending at first, curved ; 

 outer and basal regularly curA'ed, columellar obliquely ascending, 

 triangularly dilated and overhanging the umbilicus, which shows 

 half of the penultimate whorl, when it suddenly contracts. 



Major diam. 17-22, minor 14-17, alt. 8-10-5 mm. 



Hah. India : Sylhet ; Assam {Stoliczl-a, Peal) : Darjeeling 

 {Stoliczka, Maimvaring); Khasi Hills and Dafla Hills {Godivin- 

 Atisten). Burma : Bhamo (Anderson) ; Tbagata Juva, Mouleyit 

 Mt. (Fea). 



Apparently a common shell, having been collected by several 

 naturalists. The original diagnosis by Benson is very short and 

 might apply to several allied forms — a very unusual occurrence 

 with Benson's species. The above description is drawn up from 

 a number of specimens collected for the wi'iter by a native in the 

 Khasi Hills. 



The following varieties are admitted : — 



Var. procumbens, Gould. 



Helix procumbe7is, Gould, Boston Journ. jSat. Hist, iv, 1844, 

 p. 453, pi. 24, tig. 1 ; Philippi, Abb. Beschr. Couchyl. iii, 1847, 

 Helix, p. 3, pi. 10, fig. 5 ; Reeve, Conch. Icon, vii, 1852, pi. ^2, 

 fig. 435. 



Helix delibrata, Pfeiffer, Conch. -Cab., Helix, iv, 1854, p. 352, 

 pi. 135, tigs. 8, 9. 



Helix delibrata, \ax. procumbens, Nevill, Hand List, i, 1878, p. 76. 



Differs from the type in having the last whorl more dilated 



