628 MR. c. BOCK ON SHELLS FROM [May 17, 



covered in Martinique and Guadaloupe. If not now existing in these 

 islands, there could be little doubt that the form must formerly have 

 occurred there. 



The following papers were read : — 



1 . List of Land and Freshwater Shells collected in Sumatra 

 and Borneo, with Descriptions of new Species. By 

 Carl Bock. 



[Received April 4, 1881.] 

 (Plate LV.) 



The specimens mentioned in this paper were collected in the high- 

 lands of Padang, in Sumatra, and in the east and south part of 

 Borneo, during my recent travels. 



In determining the species and comparing the specimens with 

 those in the British Museum, I have to acknowledge much assistance 

 received from Mr. Edgar Smith. In the case of such difficult forms 

 as Melania, I have not ventured to determine the species myself, 

 but have forwarded my specimens for determination to Dr. A. Brot, 

 of Geneva, who is our highest authority on this group of freshwater 

 shells. 



I. Shells collected in the District of Padang, Sumatra. 

 A. Land Shells. 



1. NaNINA (ArIOPHANTA) rOVEATA, Pfr. 



Of this fine sinistral Helix I found two adult live shells at 

 Sidjoeudjoeng. 



2. Nanina (Hemiplecta) densa, var., Adams & Reeve. 

 Nanina {Hemiplecta) schumacheriana, Pfr. 



Three specimens from Mount Sago and Sidjoeudjoeng. Mr. Wal- 

 lace found this species in Borneo. 



3. Helix (Camcena) tomentosa, Pfr. 



Only two specimens found (one adult) at Sidjoeudjoeng. 



4. Nanina (Xesta) malaccana, Pfr. 



This brittle shell I found very abundant in the coffee- plantations 

 at Paio. 



5. Helix (Plectotropis) sumatrana (v. Martens). 

 At Ajer Mantjoer ; scarce. 



6. Helix (Nanina) granaria, sp. nov. (Plate LY. fig. 1 .) 

 Shell thiu, sinistral, conical, depressed, of an olive-brown colour. 



