HELIX.— Plate CXXIV. 



Species 743. (Mus. Benson.) 



Helix decussata. Bel. iesld minute umbilicatd, depres- 

 sd, subdiscoukd, tenui, vioide corned, pellucidd ; an- 

 fracliiiis sex ad sep/em, supra ptaiiiusculis, l^ecigatis, ad 

 suluram mar(jinatis el tenuipUcalk, ultimo obtuse cari- 

 nalo, sublus convexo, medio excavalo ; aperlurd ob- 

 /if/iie lunari ; peristomale simpUci. 



The decussated Helix. Shell minutely umbilicated, 

 depressed, somewhat discoid, thin, bright liorny, 

 transparent ; whorls six to seven, rather flat at the 

 up])er part, smooth, margined and tinely plicated at 

 the suture, last whorl obtusely keeled, convex be- 

 neath, excavated in the middle ; aperture obliquely 

 lunar ; lip simple. 



Nanina decussata, Benson, Journ. Asiatic Soc. of Calcutta, 

 1836, vol. V. p. 351. 



Hah. East Frontier of Bengal. 



A bright pellucid golden-horny shell, with a horny coat- 

 ing about the under part which is more or less deciduous. 



Species 744. (Mus. Benson.) 



Helix cacuminifeea. Hel. testa vix umbilicatd, tenui, 

 fitsco-corned, pyramidali-Trochiformi ; spird concavo- 

 elevatd, apice acuta ; anfractibus octo, superni piano- 

 cuncavis, granulis spiraliter gemmatis, ultimo acuthssimi 

 carinato, sublus convexo, polilo ; aperlurd transverse 

 lunari ; peristomate simplici, acuto, ad carinam subsi- 

 nuato. 



The steeple-crowned Helix. Shell scarcely umbi- 

 licated, thin, brown-horny, pyramidally Trochus- 



shaped ; spire concavcly raised, sharp at the apex ; 

 whorls eight, flatly concave at the upper part, and 

 spirally gemmed with granules, last whorl verj- 

 sharply keeled, convex and polished beneath ; aper- 

 ture transversely lunar ; lip simple, sharp, slightly 

 sinuated at the keel. 



Benson, Ann. and Mag. Nat. Hist. 1850, vol. v. p. 214. 



Hab. Summits of Nilgherry Mountains. 



This is a remarkable species, differing from all others in 

 the development of a Trochus-like grain-pattern sculpture. 



Species 745. (Mus. Benson.) 



Helix Teotteuiana. Ifel. iesld imperforatd, tubgloboso- 

 turbinatd, injlatd, tenuitsimd, hyalino-albd, ep'ulermide 

 tenui corned virescenle indutd, apice carneo-ru/d ; 

 spird breciusculd ; anfractibus quatuor, convexis, irre- 

 gulariter plica/o-slriatis ; aperlurd ampld ; peristo- 

 mate simplici, acuto, margine columellari breviter re- 

 toluto. 



Trotter's Helix. Shell imperforated, somewhat glo- 

 bosely turbinated, inflated, very thin, hyaline-wiiite, 

 covered with a thin homy greenish epidermis, flesh- 

 red at the apex ; spire rather short ; whorls four, con- 

 vex, irregularly plicately striated ; aperture large ; lip 

 simple, sharp, columellar margin shortly turned back. 



Benson, Ann. and Mag. Nat. Hist. 1848, vol. ii. p. 161. 



Uab. Uitenhage, South Africa ; K. Trotter. 



An inflated vesicular species, of hyaline substance, co- 

 vered with a transparent greenish-horny epidermis, tinged 

 with red at the apex. 



