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Show 628 MR. C. BOCK ON SHELLS F R O M [May 17, covered in Martinique and Guadaloupe. If not now existing in 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 highlands 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) FOVEATA, Pfr. Of this fine sinistral Helix I found two adult live shells at Sidjoendjoeng. 2. NANINA (HEMIPLECTA) DENSA, var., Adams & Reeve. Nanina (Hemiplecta) schumacheriana, Pfr. Three specimens from Mount Sago and Sidjoendjoeng. Mr. Wallace found this species in Borneo. 3. HELIX (CAMCENA) TOMENTOSA, Pfr. Only two specimens found (one adult) at Sidjoendjoeng. 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 LV. fig. I.) Shell thin, sinistral, conical, depressed, of an olive-brown colour, |