IIELIX §. \S. 19. 37 



225 H. Mononcma Bcnson. 



T. angustissime perforata, trochiformis, radiato-striatula, 

 corneo-albida, parum nitida, translucens; spira conica, apico 

 acutiusculo; sutura distincta; anfr. Gy^ — 7 subaequales, superne 

 convexiuscuii, filo unico clevato, tenui, mediano cincti, ultimus 

 acute tiloso-carinatus, subtus subplanulatus; apertura verticalis, 

 depresse securiformis ; perist. rectum , acutum , marginibus di- 

 stantibus, columellari brevi, verticali, reflexo, perforationem 

 subtegente. — Diam. maj. 5, min. 4V2, alt. 4^2 mill. (Mus. 

 Cuming.) 

 . Helix Mononema Bens. in Ann. and 3Iag. 2d. ser. XII. p. 92. 



— — Reeve Conch. ic. n. 1339. t. 191. 



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



Habitat ad Heneratgodde insulac Ceylon (Layard). 



226. H. trifilosa Pfr. 



T. perforata, depresse trochiforujis, tenuis, radiato-striata, 

 acule carinata, vixnitidula, pallide cerea; spira conoidea, apico 

 hyalina, obtusula; sutura marginata; anfr. GY^ convexiusculi, 

 arcte convoluti, superne carinis 3 filiforniibus muniti, ultimus 

 non descendens, basi convexior, nitidus; apertura verticalis, 

 depressa, angulato-lunaris; perist. rectum, acutum, marginibus 

 remotis, supero brevissimo, basali leviter arcualo, coluinellari 

 declivi, superne dilatato, reflexo. — Diam. maj. 0%, min. 5, 

 alt. 3V2 mill. (Mus. Cuming.) 



Helix trifilosa Pfr. in Froc. Zool. Soc. 18o3. p. 125. 



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



Habitat in insula Ceylon (Thwaitcs). 



227. H. Calabarica Pfr. 



T. perforata, turbinato-lentiformis, tenuis, laevigata, supernc 

 liris 6 argutis, filiformibus cincta, diaphana, cornea; spira co- 

 noidea, acutiuscula; anfr. 6 convexiusculi, sensim accrcscentes, 

 ultimus non descendens, acute carinatus, basi convcxus; aper- 

 tura parum obliqua, angulato-lunaris; perist. simplex, rectum, 

 marginibus vix convergentibus, columeilaii arcuato, superne \i\ 

 reflexo. — Diara. maj. 9^2, min. 8V3, alt. 4^,^ mill. (Mus. Cuuiing. 

 An adult.?) 



Helix Calabarica Pfr. in Pioc. Zool. Soc. 1856. p. 327. 

 Habitat « Old Calabar » orae Guineensis. 



§. 19. 



228. MousBoni Pfr. (Rv. n. 479. l. 88. — Ch. cd. 

 nov. III. p. 298. — Xanina Moussoni Gray Cat. 

 Pulm. p. 139. — Hemiplecta Pfr. Vers. p. 1-20.) AIuii 111 i>. 53. 



