124 
HELIX §. 2L 
nentibus concentricis exasperata; anfr. 6 convexiusculi, lente 
accrescentes, ultimus basi inflatus, confertim et radiatim costulato- 
striatus; umbilicus mediocris , pervius; apertura lunato-elliptica; 
perist. simplex, vix incrassatum, marginibus callo lineari junctis. 
— Diam. maj. 21 , min. 19, ait. 10 mill. (Coli. Nr. 168.) 
Helix radula Pfr. in Proc. Zool. Soc. 1845. p. 40. 
— — Phil. Icon. 1. 7. p. 155. t. 4. f. 11. 
— — Chemn. ed. II. Helix N. 621. t. 97. f. 4 — 6. 
Habitat in provincia Iloconensi insulae Luzon (Cuming). 
321. H. strigilis Pfr. 
T. umbilicata, depressa, lenticularis, tenuis, pellucida, pal- 
lide cornea, acute carinata; spira parum elevata; anfr. 6 angusti, 
vix convexiusculi, superne confertim costulato-striati, lineis ele- 
vatis concentricis reticulati, ultimus basi convexior, laevigatus, 
nitidus; umbilicus mediocris, cylindricus; apertura subverticalis, 
angulato-lunaris ; perist. simplex, acutum, margine supero brevi, 
strictiusculo, basali valde arcuato. — Diam. maj. 12, min. 11, 
ait. 5/2 mill. (Mus. Cuming, et Coli. Nr. 169.) 
Helix strigilis Pfr. in Proc. Zool. Soc. 1845. p. 124. 
_ _ Chemn. ed. H. Helix N. 543. t. 87. f. M — 1 4.' 
Habitat ad Himamaylan insulae Negros Philippinarum (Cuming). 
322. H. albocincta Pfi*. 
T. umbilicata, orbiculato-convexa , tenuiuscula, superne re- 
gulariter et confertim striata, sericina, fulvo-cornea, carinata; 
spira depresso-conica , apice obtusa; anfr. 5 V 2 convexi, carina 
alba cincti, ultimus basi sublaevigatus, lineis subtilibus, concen- 
tricis notatus; umbilicus mediocris, pervius; apertura obliqua, 
angulato-lunaris; perist. simplex, acutum. — Diam. maj. 11, 
min. 10, ait. 5 mill. (Coli. Nr. 170.) 
Helix albocincta Pfr. in Proc. Zool. Soc. 1845. p. 123. 
— — Chemn. ed. H. Helix N. 545. t. 87. f. 17 — 20. 
Habitat ad Himamaylan insulae Negros (Cuming). 
^^^^323. H. ptychodes Pfr. 
T. umbilicata, depressissima, discoidea, tenuissima, arcuato- 
plicata, sub epidermide tenui, fusca, decidua hyalina; spira pla- 
niuscula; anfr. 4/2 — 5 plauulati, ultimus basi vix convexior; 
umbilicus mediocris; apertura perobliqua, ampla, angulato-lunaris; 
perist. simplex, acutum. — Diam. maj. IO/3, min. 9, ait. 3/3 mill. 
(Mus. Cuming.) 
Helix ptychodes Pfr. in Proc. Zool. Soc. 1845. p. 137. 
Habitat prope Blucfields insulae Jamaicac (Gosse). 
