200 IIELTCID.l'. 



172. Eulota cestus, Benson. 



Helix cestus, Benson, J. A. S. B. v, 1836, p. 353 ; ibid., A. M. N. H. 



ser. 2, ii, 1848, p. lQ-2 : Reeve, Conch. Icon, vii, 1852, pi. 125, 



fig. 751 ; Pfeiffer, Conch.-Cab., HcUx, i, 1853, p. 339, pi. 60, 



figs. 19, 20 ; Mabille & Lemesle, Journ. Conchvl. 1866, p. 127 ; 



llanley & Theobald, Conch. Ind. 1870, pi. 29, fig. 7. 

 Helix (I)orcasia) cestus, von Martens, Die Heliceen, ed. 2, 1860, 



p. 107. 

 Helix (Trachea) cestus, Godwin-Austen, J. A. S. B. xlv, 1870, 



p. 312. 

 Helix {Pkmispira ) cestus, Nevill, Hand List, i, 1878, p. 80. 

 Helix (Helicella (Dorcasia)) cestus, Trvon, Man. Conch, ser. 2, 



iii, 1887, p. 206, pi. 47, figs. 31, 32. 

 Eulota (s. s.) cestus, Pilsbrv, Man. Conch, ser. 2, ix, 1895, p. 204. 



Orif/inal description, amended : — " Testa perforata, subdepresso- 

 conoidea, fuscescente-cornea, subplicato-striata, supra angulum 

 castaneo-uuizonata ; spira subconoidea, apice obtusato ; anfract- 

 ibus 5, leviter convexis, supra planulata, ultimi peripheria 

 angulata, basi convexiuscula ; apertiira obliqua, depreSvSa, minima 

 transversa (altitudine latitudinem aequante), rotundato-lunari, 

 superne labro-antrorsum arcuato, expansiusculo, margine colum- 

 ellari basalique reflexis illo dilatato, perforationem semitegente. 



" The greater narrowness of the perforation which is nearly 

 concealed by the reflected columellar lip, the more obtuse apex, 

 more planulate whorls, less convex base, the oblique, sinuous, and 

 less transverse depressed aperture and the more angular periphery, 

 serve, independently of colour, to distinguish H. cestus from any 

 of the varieties of H. siviilaris.'' (Benson 1848.) 



Major diam. 13-25-16-5, min. 11-5-15-25 mm. ; alt. 8-75- 

 12 mm. 



Hah. India: Sylhet, Assam {Maimvaring, my collection); 

 Durrang Plains, Dafla Hills, Assam (Godwin- Austen). Cambodia : 

 Moth-Kasa (Mahille tj- Lemesle). 



Pfeiifer originally considered H. cestus to be synonymous with 

 H. similaris (Mon.Helic. Yiv. i, 1848, p. 336), but subsequently 

 modified his opinion, stating that he had been misled by speci- 

 mens received under that name from China and which proved 

 to pertain to H. similaris (op. cit. iii, 1853, p. 228). Tryon also 

 thought it was perhaps only a variety of that species. Etdota 

 cestus appears to me quite distinct, however, as it can readily be 

 separated from the numerous forms of E. similaris by several 

 characters, as pointed out by Benson in his amended description. 

 The species, in fact, rather resembles Planispira slianica in shape 

 and contour, but it is not plicate, the umbilicus is narrower, the 

 peristome moi'e expanded and the columellar lip more reflected. 



173. Eulota similaris, Ferussac. 



Helix {Helicella) similaris, Ferussac, Tabl. Syst. LimaQons, 1822,, 

 no. 262 (-(-« unicolor, /3 zonvlata) (noni. uud.). 



