148 



SCIENCE- GOSSIP. 



Mr. Benson divided the genus into three sections ; 

 the typical section comprising P. achalina and 

 P. cyclaspis ; the second section consisting of/", refiiga 

 and P. leiopkis, while the third section contained 

 P. pleciostoina and P. pinacis. The great number of 

 species discovered since Benson's time necessitates 

 still further division, and I propose the following 

 synopsis. 



I. Section Endothyra, n. sec. Type P. pUcto- 

 stoma. (Third section of Benson). Sinistral. Umbilicus 

 moderate. Palatal folds horizontal or oblique. 



Habitat : Sikkim, Assam, Burma. 



1. P. minor, G.A. Darjeeling, Sikkim ; Naga 

 Hills, Assam. 



2. P. hanleyi, G.A. Sikkim. 



3. P. blanda, Gude. Naga Hills. 



4. P. macromphalus, W. Blf. Darjeeling ; Khasia 

 Dafia and Naga Hills. 



5. P. sowerbyi, Gude. Khasia Hills. 



6. P. plectostoma, Bens. Darjeeling, Sikkim ; 

 Dafla Khasia and Naga Hills, Sylhet, Kohima, 

 Assam ; Cherra Poonjee, Munipur ; Bassein, 

 Arakan. Pegu. 



prodigmiii^ Bens. 



v. tricarinata, Gude. Khasia Hills. 



7. P. affinis, Gude. Khasia Hills. 



8. P. pinacis, Bens. Darjeeling, Bungmaval, Sikkim. 



pettos, Mts. 



9. P. fultoni, G.A. Khasia Hills. 



II. Section Chersaecia, n. sec. Type P. leiopkis. 

 (Second section of Benson). Sinistral or dextral. 

 Umbilicus wide. Palatal folds horizontal or oblique. 

 Sometimes with one oblique or vertical plate. 



Habitat : from Assam through Upper Burma and 

 Laos to Tenasserim. 



10. P. muspratti, Gude. Naga Hills, Assam. 



11. P. austeni, Gude. Diyung Valley, Singpho, 

 Assam. 



12. P. oglei, G.A. Sadiya, Assam. 



13. P. serica, G.A. Naga Hills. North Cachar. 



sericata, Hanley and Theob. 



14. P. munipurensis, G.A. Munipur. N. E. 

 P'rontier, Bengal. 



15. P. nagaensis, G.A. Naga Hills. 



16. P. pseudophis, W. Blf. Thayat Myo, Pegu. 



17. P. leiophis, Bens. Thayet-Myo, Kivadouk, 

 Akoutoung, Pegu. 



refuga, auct. 



18. P. refuga, Gould. Tavoy, Tenasserim. Pegu. 



19. P. perrierae, Gude. Thayet-Myo, Pegu. 



20. P. shiroien,sis, G. A. Shiroifurar, Munipur. 



21. P. perarcta, W. Blf. Mya Leit Doung, Ava. 

 Hlaindet, Upper Burma. 



22. P. brachydiscus, G. A. Moulmain, Tenas.serim. 



23. P. dextrorsa, G. A. Tenasserim. 



24. P. shancnsis, Stol. Pegu ; Shan states. 



tritaiiiellaris, G. A. 



25. P. brahma, G. A. Brahmakhund, E. Assam. 



26. P. andersoni, W. Blf. Bhamo, A\'a, Upper 

 Burma. Hoelone, Yunnan. 



27. P. laomonlana, I'fr. Luang I'rabang, Laos. 



HI. Section Endopi.ON, n. sec. Type P. 

 hrachyphcta. Dextral. Palatal folds hnrizonliil. 

 oblique, or almost vertical. 



Habitat : Tonkin, Burma. 



28. P. smithiana, Gude. Attaram, Burma. 



29. P. brachyplecta, Bens. Moulmain. 



30. P. giardi, H. Fischer. Cao-Bang, Tonkin. 



31. P. congesta, Gude. Tonkin. 



32. P. fran9oisi,H. Fischer. Dei>-Ma-Phuc, Tonkin. 



33. P. jovia, Mab. Halong, Tonkin. 



34. P. schlumbergeri, Morlet. ' Halong, Elephant 

 Mountain, Nuy-Dong-Nay, Tonkin. 



35. P. villedaryi, Ancey. Lang-Son, ]!ac-Ninh, 

 Tonkin. 



36. P. phlyaria, Mab. Tonkin. 



IV. Section Plectopylis, s. s. Type P. achalina. 

 (Typical section of Benson). Sinistral. Shell 

 flattened. Palatal armature : one vertical plate with 

 three horizontal folds above, one below. 



Habitat : Burma. 



37. P. ponsonbyi, G.A. Hlaindet, Burma. 



38. P. lissochlamys, Gude. Moulmain. 



39. P. magna, Gude. Moulmain. Taunghu, Pegu. 



40. P. woodthorpei, Gude. Fort Stedman, Burma. 



41. P. leucochila, Gude. Burma. 



42. P. feddeni, W. Blf. Prome, Pegu. 



43. P. cairnsi, Gude. Burma. 



44. P. cyclaspis, Bens. Moulmain ; Tenasserim. 



catinus., Bens. 

 revoliUa, Pfr. 



45. P. karenorum, W. Blf. Arakan Hills ; Hen- 

 zada ; Pegu. 



burnianica^ Bens, M.S. 



46. P. Imterae; MUdff. Pegu. 



V. fusca, Gude. 



47. P. anguina, Gld. Tavoy, Tenasserim. 



48. P. achatina, Gray. Moulii,iain ; Tavoy. 



V. repercussoides, £ude. Burma. 

 V. infrafasciata, Gude. Moulmain. 

 V. castanea, Gude. Burma. 

 V. obesa, Gude. Moulmain. 

 V. venusta, Gude. Burma. 

 pachys/onia, Theob. M.S. 

 V. breviplica, Gude. Burma. 



49. P. repercussa, Gld. Moulmain. Tavoy. 



V. Section Si.\lCOl.A, n. sec. Type P. Jii/iliriosa. 

 Dextral. Palatal folds horizontal. 

 Habitat : China ; Tibet i species. 



50. P. emoriens, Gredl. Hoo-Nan. 



51. P. azona, Gredl. Badung, Hoo-Pe. 



52. P. pulvinaris, Gld. Canton ; Hongkong. 



53. P. fimbriosa, Mts. Kiang-Si. 



v. nana, Mlldff. 



v. continentalis, Mljdfl'. 



54. P. reserata, Heude. Tchen-Keou. Badung, 

 Hoo-Pe. 



55. P. laminifera, Mlldff. Hoo-Pe. 



56. P. jugatoria, Anc. Kouei-Tchou. 



57. P. diptychia, Mlldff. Kouei-Tchou. 

 5S. P. biforis, Heude. Ta-Kouan-Tchen. 

 59. P. stenochila, Mlldff. Hoo-Pe. 



v. basilia, Gude. Badung, Hoo-P^. 



i 



