30 PTEROCYCLOS §. 3. 



funde impressa; anfr. 5 eonvexi, ultimus lente descendens, 

 superne alatus, breviter solutus: ala prominentiam elongatam 

 ano-ustam ascendentem formantc , postice carina obtusa desi- 

 nente ; apertura obliqua, subcircularis ; perist. duplex : internum 

 porrectum , superne profunde incisum, externum incrassatum, 

 superne dilatatum, leviter deflexum ; umbilicus profundiusculus. 

 — Operc. pyramidale. — Diam. maj. 19^2 > ™i^- l^? ^l^. 6 

 mill. Ap. diam. S^/a mill. (Mus. Benson). 



Ptcrocyclos Cinijalensis Bcns. in Aiui. and Mag. N. H. 2d. ser. XI. 

 p. 105. 

 _ _ Pfr. in Malak. Bl. 1854. p. 81. 



Habitat ad vicum montanum Monahagalla insulae Ceylon 

 (E. L. Layard). 



Obs. Persimilis Pt. Ciimingi, umbilico latiore et peristomate distincte 

 duplicato discrcpans. 



6. Pt. bifrons Pi'r. 



T. umbilicata, discoidea, solida, superne arcuato-striatula, 

 nitida, purpurascenti-castanea; spira plana, vertice subtili, 

 lucide castaneo; sutura alba; anfr. 6 convexi, ultimus latior, 

 peripheria obsolete angulatus, antice descendens et juxta sutu- 

 ram prominentiam fornicatam formans, basi violaceus; apertura 

 diagonaUs, subcircularis ; perist. duplicatum, incrassatum : in- 

 ternum superne sulco triangulaxi interruptum , externum sub- 

 patens, superne productum et in prominentiam anfractus ultimi 

 transiens. — Operc? — Diam. maj. 25, min. 2IV25 ah. 8 mill. 

 Ap. diam. 7 miil. (Mus. Cuming.) 



Pterocyclos bifrons Pfr. in Proc. Zool. Soe. 18!)5. p. 117. 

 Habitat in insula Ceylon. 



Obs. Diftert a Pt. Cutningi ]n-a.cter colorem anfractu ultimo latiore, 

 umbilico angustiore, pcristomate duplicato. 



7. bilabiatiis Betis. ( Gray Plian. p. 31. — Jd. Gen. 



p. 277.) Mou. p. 49. 



8. Aibersi Pfr. {Orai/ Phan. p. 28. — Jd. Gen. 



p. 277. — Variat unicolor pallide corneo-lutescens. — 

 Hab. ad Teria Ghat, montium Khasia dictorum por- 

 tam : Hens. in Ann. .ind Mag. 1857. XIX.) ... - - 45. 



9. ansulireriis Soiii. (Coll. 38. — (Mty Phan. 



p. 27. — yid. Gen. p. 277. — Cycloiiis? angidifc- 

 rus M. E. Gray Fig. Moll. Anim. t. 303. f. 9. [ex 

 Soul.] — Cyclostoma angulifcra Soiil. Voy. Bonite. 



Zool. II. p. 530.) - - 44. 



10. riiiieMtris Bens. (Coll. 39. — 6'A, ed. nov. p. 231. 

 — Gray Phan. p. 29. — Ad. Gen. p. 277. t. 85. 

 f. 3. _ Steqanotoma picta Trosch. — Stcgan. rupc- 

 Stris Mdrch Yold. p. 41. n. 822.) - - 46. 



