HELIX §. <8. i9. 37 



225. H. Mononema Benson. 



T. angustissime perforata, trochiformis, radiato-strialula, 

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

 acutiusculo; sutura distincta; anfr. 6V2 — 7 subaequales, superne 

 convexiusculi, filo unico elevato, tenui, mediano cincti, ultimus 

 acute filoso-carinatus, subtus subplanulatus ; apertura verticalis, 

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

 stantibus, columeilari brevi, verticali, reflexo, perforationem 

 subtegente. — Diam. maj. 5, min. 47^, alt. 4^2 mill. (Mus. 

 Cuming.) 



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



— — Reeve Conch. ic. n. 13.39. t. 191. 



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

 Ilabitat ad Heneratgodde insulae Geylon (Layard). 



226. H. trifilosa Pfr. 



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

 acute carinata, vixnitidula, pallide cerea; spira conoidea, apice 

 hyalina, obtusula; sutura marginata; anfr. 6^^ convexiusculi, 

 arcte convoluti, superne carinis 3 filiformibus muniti, ultimus 

 non descendens, basi convexior, nitidus; apertura verticalis, 

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

 remotis, supero brevissimo, basali leviter arcualo, columellari 

 declivi, superne dilatato, rcflexo. — Diam. maj. 5%, min. 5, 

 alt. 3^2 mill. (Mus. Cuming.) 



Helix trifilosa Pfr. in Froc. Zool. Soc. 1853. p. 125. 



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



Ilabitat in insula Ceylon (Thwaites). 



227. H. Calabarica Pfr. 



T. perforata, turbinato-Ientiformis, tenuis, laevigata, superne 

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

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

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

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

 marginibus vix convergentibus, columellari arcuato, superne vix 

 reflexo. — Diam. maj. Oy^, min. 8V3, alt. 4^2 mill. (Mus. Cuming. 

 An adult.?) 



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

 Habitat « Old Calabar » orac Guineensis. 



§. 19. 



228. MousBoni Pfr. {Rv. n. 479. (. 88. — Ch. ed. 

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

 Pulm. p. 139. ~ Hemiplecta Pfr. Vers. p.' 120.) Mon, III. p. 53. 



