32 
PTEROCYCLOS §. 3. 4. 
14. Pt, Cetra Ben§on. 
T. late umbilicata, orbiculato-depressa, capillaceo-striatula, 
luteo-cornea, sup erne strigis radiatis, subremotis, irregularibus, 
rufis ornata; spira planata, apice vix prominulo; anfr. 5 con- 
vexiusculi, regulariter accrescentes, ultimus breviter descendens, 
circa umbilicum dimidium diametri subaequantem subangula- 
tus ; apertura obliqua, circularis; perist. duplex : internum con- 
tinuum , breviter porrectum , superne breviter emarginatum, 
externum expansum , incrassatum , superne lingua obtusa vix 
descendente, sinu profundo ab anfractu penultimo separata, 
muni turn. — Operc. ? — Diam. maj. 13, min. 10, alt. 4 mill. 
(Coll. Benson.) 
Pterocyclos Cetra Bens, in Ann. and Mag. N. H. 2d. ser. XVII. p. 228. 
— — Pfr. Novit. conch. I. n. 216. t. 35. f. 10 — 12. 
Habitat ad Moulmein et in valle Tenasserim imperii Birmani 
(W. Theobald). 
15. S*t. tetter MestSte. 
T. umbilicata, depressa, tenera, costis prominentibus mem- 
branaceis munita, pellucida, virenti-cornea ; spira medio vix 
elevata; anfr. 5 convexiusculi , ultimus teres, antice solutus; 
umbilicus latus, 2 / 5 diametri subaequans ; apertura parum ob- 
liqua , subcircularis , intus leviter margaritacea ; perist. sub- 
duplex: internum superne breviter incisum, praeterea sub ad- 
natum , externum brevissime patens , incisuram prominentia 
levi tubuliformi obtegens. — Operc.? — Diam. maj. 17, 
min. 13 , alt. 6 mill. Ap. diam. 5 2 / 3 mill. (Mus. Menke et 
Coll. Nr. 41.) 
Pterocyclos tencr Menke in Malakoz. BI. III. 1856. p. 69. 
— — Pfr. Novit. conch. I. p. 90. n. 154. t. 25. f. 13—15. 
Habitat Touranne Cochinchinae. 
§■ 4 . 
16. Bfosidi Betts, f {Gray Phan. p. 31. — Ad. 
Gen. p. 277.) Mon. p. 49. 
17. Troselteli Betts, f {Gray Phan. p. 27. — did. 
Gen. p. 277.) - - 44. 
IV. Alycaeus Gray. 
Conf. Pfr. Mon. Pneum. p. 119. — Gray Cat. Phan, 
p. 84: genus Cyclophorinorum. — Bens, in Ann. and Mag. 
