breve, rnargine siii)oro iiioisum, externura superne in 

 alam vel rostrum tectiforme dilatatum. 



§. 1. 

 Peristomate interno deficiente. — Oj^erculum? 



*45. Pt. incomptus Sow., Pfr. in Z, f. M. 1851. p. 9. 



— India? 



§. 2. 



Peristomate duplice, operculo planiusculo, anfrac- 



tibus extimis lamellatim elevatis. 



(Myxostoma Trosch.) 



46. P. brevis Martyn, Pfr. in Z. f. M. 1851. p. 9. — 

 (Cycl. Petiverianum Wood.) — India. 



47. P. planorbulus Lam. Encycl. meth. t. 461. f. 3! 



— Borneo? 



§. 3. 



Genuini, operculo extus valde convexo, margine 



anfractuum lamellatim patente. 



(Steganoioma Trosch.) 



-i-48. P. Troscheli Bens. iu Ann. and Mag. 1851. 



VIII. t. 5. f. 2. — Ceylon. 

 49. P. anguliferus Soul, Pfr. in Z. f. M. 1851. p. 



6. — Cochinchina. 

 *50, P. tenuilabia tus Metcalfe in Proc. Zool. Soc. 

 1851. — Borneo. 



51. P. Albersi Pfr. Z. f. M. 1851. p. 6. — Habitat? 



52. P. hispidus Pears. , Pfr. ibid. p. 6. (Cycl. spira- 

 culum So7v., Steganotoma Prinsepi v. d. Busch, Pt. 

 Prinsepi Pfr.) — India. 



53. P. rupestris Bens. , Pfr. ibid. p. 4. (Steganotoma 

 pictum Trosch., Pteroc. pictus Trosch., Cycl. pictum 

 Petit.) — India. 



*54. P. parvus Pears. , Pfr. ibid. p. 5. — India. 

 55. P. Cumingi Pfr. in Z. f. M. 18>1. p. 5. Ic. t. 31. 

 f 6 — 8. — Ceylon. 



