28 IIELIX §. 14. 



vix convexiusculi , ultimus non descendens, peripheria sub- 

 angulatus, superne convexus, basi planiusculus; apertura vix 

 obliqua, depressa, subangulato-lunaris; perist. simplex, rectum, 

 margine basali versus insertionem leviter incrassato. — Diam. 

 maj. ny^» niin. 16, alt. II mill. (Mus. Univers. Monac.) 



Helix tahida Pfr. in Malak. BI. II. 1855. p. 106. 



— — Pfr. Novit. conch. I. p. 45. n. 79. t. 12. f. II. 12. 



— — (Trochomorpha) Pfr. Vers. p. 132. 



Habitat in montibus Nilagiricis Indiae. 



Ohs. Affinis H. Guerini et crinigerae, sed major, non carinata. 



174. H. Isabella Jacqulnot. •{• 



T. anguste umbilicata , convexo-deprcssa , striolis confertis 

 regularibus sculpta, cinnamomea, basi pallida; spira brevis, 

 convexo-conoidea. obtusa; anfr. 6 modice convcxi, sensim 

 accrescentes, ultimus medio subangulatus, basi laevior; aper- 

 tura late lunaris; perist. rectum, incrassatum, margine basali 

 subdentato , versus umbilicum attenuato. — Diam. maj. 26, 

 min. 23, alt. 17 mill. (Ex icone.) 



Ilelix Isabella Ilonibr. et Jacq. Voy. Pol Sud. Zool. V. p. 6. 



t. i. f. V— 10. 



Ilabilat Singapore. 



175. H. subdecussata Pfr. 



T. perforata, turbinata, tenuis, irregulariter plicato-striata, 

 supcrne striis spiralibus obsolete decussata, pellucida, virenti- 

 liyalina; spira conica, apice obtusula; anfr. 6 convexiusculi, 

 ultimus non descendens, peripheria subcarinatus, basi con- 

 vexior, nitidus; apertura obliqua, late lunaris; perist. simplex, 

 rectum, marginibus remotis, columellari superne vix reflexius- 

 culo. — Diam. maj. 14, min. 12, alt. 9 mill. (Mus. Cuming.) 



Helix subdecusmta Pfr. iu Proc Zool. Soc. 1857. p. 107. 

 Ilabitat prope Bombay Indiae. 



176. H. pansa Bcnson. 



T. pcrforata, conoideo-deprcssa, conferlini obliqac striata, 

 subtus nitida, radialim striatula, translucens, fusco-cornea ; 

 spira convexo-conoidea, apice prominulo, glabro, nitido; su- 

 tura leviter impressa; anfr. 6 lente accrescentes, convexius- 

 culi, ultimus ad peripheriam subcarinatus, subtus convexius- 

 culus; apertura obliqua, late lunaris; pcrist. rectum, acutum, 

 inargine columcllari oblique descendentc, supcrne brcvitcr rc- 



