no. 48. — 1897.] ceylon malacolouy. 19 



Fam. Cyclostomin^. 

 26,—Pterocyclos Cumingii, Pfr. 

 I have a few specimens from Lower Ambagamuwa, but 

 the species does not occur in the upper part of the district. 

 Habitat in decaying vegetation, 2,000 ft. 



27. — Aulopoma helicinum, Chemn. 



This species is common throughout the district. The 

 outer whorl of the operculum is flexible and retractile, and 

 does not always overlap the peristome of the shell, as some 

 observers have stated. 



Habitat in thick scrub, lantana, &c, among fallen leaves. 



28. — Cyclophorus annulatus, Troschel. 



This species is common throughout the district. The 

 shells taken in the lower part of the district are as a rule 

 larger than those found above an altitude of 3,000 ft. 



I have one large specimen, taken alive, with the two first 

 (central) whorls of the shell absent. Young specimens are 

 striated in the line of growth by short bristly ridges of the 

 epidermis. 



Habitat in forest and scrub, beneath fallen leaves. 



29.— (7. Bairdii, Pfr. 



I have found this species fairly abundant among fallen 

 leaves in heavy forest. 



Young shells are coated with an olive-brown velvety 

 epidermis, which disappears on full-grown specimens. 



30. — G. ceylanicus, Pfr. 

 This species is common in Lower Ambagamuwa, but does 

 not occur in the upper part of the district. It is a low- 

 country species. 



31. — G. Jerdoni, Benson. 



This is very near the last species. I have one specimen 

 from the lower part of the district. 



32. — G. cratera, Benson. 



This species is not common here. I have found a few 

 specimens among fallen leaves in forest, 3,000 ft. 



