102 HELIX §. 20. 



448. H. Arthurii Pfr. 



T. umbilicata, depressa, tenuiuscula, costulato-striata, 

 lineis spiralibus confertis decussata, oleoso-nitens, diaphana, 

 olivaceo-cornea; spira vix elevata, vertice subtilissimo; sutura 

 profunda; anfr. 5 convexiusculi , ultimus rotundatus, non de- 

 scendens; umbilicus magnus (fere % diametri); apertura 

 parum obliqua, ovato-lunaris; perist. simplex, acutum, rectum, 

 marginibus convergentibus, columellari superne vix dilatato. 



— Diam. maj. 12, min. 10, alt. 5 mill. (Mus. Guming.) 

 Helix obscurata Adarns et Reeve Voy. of Samarang. Moll. p. 59- 



t. 14. f. 18. Nec Porro. 



— Arthurii Pfr. in Zeitschr. f. Malak. 1831. p. 16. 



— — Chemn. ed. 11. Heiix N. 940. t. 143. f. 23 — 25. 

 Habitat in insula Borneo. 



449. dierama Pfr. {Chemn. ed. nov. I. p. 182.) . . . Mon. I. p. lOS. 



450. H. circumsessa Shuttleworth. 



T. mediocriter sed perspective umbilicata, depresso-glo- 

 bosa , rufescenti-cornea, concolor, subtiliter plicato-striata, li- 

 neis spiralibus epidermide fimbriatis squamulosa; spira con- 

 vexa; anfr. iy^ convexi, sensim accrescentes; sutura profunda; 

 apertura lunari-ovalis, obliqua; perist. simplex, acutum, mar- 

 ginibus conniventibus. — Diam. maj. 9, min. 7, alt. 5 mill. (Coll.) 



Helix circwnsessa Shuttlew. Diagn. n. Moll. N. 1. p. 5. 

 Habitat in insulis Teneritfa et Palma (Blauner). 



* 



451. Chiliensis Muhlf. (CoU. i97. — Chemn. ed. 



nov. II. p. M2. — Patula Alb. p. 65.) Mon. I. p. 109. 



452. H. Egesta Gray. 



T. late umbilicata, depresse semiglobosa, solidula, regu- 

 lariter spiraliter sulcata et plicis longitudinalibus validis, di- 

 stantibus, in lamellas subtriangulares, membranaceas, deciduas 

 dilatatis munita, nigro-rufa; spira brevis, convexa, superne 

 depressa; anfr. Sy^ convexi, ultimus teres, plerumque deor- 

 sum subdevians; apertura parvula, parum obliqua , lunato- 

 circularis; perist. simplex, rectum, marginibus conniventibus. 



— Diam. maj. 4^3, min. 4, alt. Sy^ miil. (Coll. Nr. 198.) 

 Helix Egesta Gray in Proc Zool. Soc. 1849. p. 166. 



— — Chemn. ed. TI. Helix N. 1039. t. 155. f. 18 — 22. 

 Habitat Auckland Novae Seelandiae (Sinclair et Greenvvood). 



453. H. exigua Stimpson. ^ 



T. minuta, discoidea, peliucida, corneo-viridescens, supra 



