235 
906a. Helix Tristrami Pfr. 
T. late umbilicata, perdepressa, acute carinata, tenuis, 
oblique plicato-striata, opaca, sordide albida, corneo ob- 
solete variegata; spira vix elevata; sutura carina leviter 
exserta marginata; anfr. 5 planiusculi, sensim accrescentes, 
ultimus infra carinam compressam, crenulatam convexus, 
antice non descendens; apertura obliqua, subsecuriformis ; 
perist, rectum, intus sublabiatum, margine supero antror- 
sum arcuato, — Diam. maj, 12, min. 101/,, alt. 4 mill. 
Hab in regno Tunetano. (Tristram.) 
1124a, Helix Nagporensis Pfr. 
T. latissime umbilicata, depressa, tenuiuscula, oblique 
striata, opaca, carneo-albida; spira medio vix prominula; 
anfr. 4 vix convexiusculi, ultimus subtus vix latior, antice 
deflexus et subtus subconstrictus; apertura perobliqua, trans- 
verse ovalis; perist. tenue, marginibus convergentibus, su- 
pero recto, basalı breviter reflexo. — Diam. maj. 10, min. 8, 
alt. 4 mill. 
Hab. Nagpore Indiae, (Jerdon.) 
1148a. Helix Batchianensis Pfr. 
T. angustissime umbilicata, conoidea, solida, oblique 
striata, fusca; spira convexo-conoidea, apice acutiuscula; 
sutura levis, carinato-marginata; anfr, 7, supremi plani, 
sequentes convexiusculi, ultimus carinatus, non descendens, 
basi profunde excavatus; apertura diagonalıs, rotundato- 
lunaris; perist. rectum, marginibus distantibus, dextro sub- 
simplice, basalı incrassato, ad insertionem flexuose ascen- 
dente. — Diam. maj. 201/,, min. 181,,, alt. 11',, mill. 
ß. Major, anfr. 81/,, ultimo infra carınam praecedentis 
recedente. — Diam. maj. 23!/;, min. 22, alt. 14 mill. 
Hab. in insula Batchian, (Wallace.) 
Habitu similis 7. Troilo Gould, bası excavata et um- 
bilico angustissimo praecipue discrepans. 
1313a. Helix Bougainvillei Pfr. 
T. imperforata, globoso-conoidea, solidiuscula, striatula, 
