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Show 734 LIEUT.-COL. GODWIN-AUSTEN AND MR. NEVILL ON [Dec. 2, face and by indications of connecting ridges between the eyes, posterior pair of eyes slightly wider apart than the anterior pair, of about equal size; lateral eyes placed obliquely, the anterior eyes fully twice the size of the central ones and four times as large as the posterior lateral ones ; pectoral shield cordiform; falces smooth, with wavy external margins and hairy internal surfaces ; maxillae long, inarched, smooth; abdomen rounded, slightly pointed behind, and almost flat below. Legs very short, their relative length 2,1,4,3 ; the anterior pair as follows-femur 2 millimetres, tibia including knee-joint 2\, tarsi 2; second pair-femur 2\, tibia 2^, tarsi 2 ; third pair-femur l\, tibia 1|, tarsi l\ ; fourth pair-femur 2, tibia If, tarsi l\ ; the legs entire therefore being-first pair 6\ millimetres, second 6-|, third 4|, fourth 5\. Length of cephalothorax and abdomen together 8 millimetres, of abdomen alone 5\. Antananarivo (Kingdon). EXPLANATION OF PLATE LVIII. Fig. 1. Epeira slateri, Butl., p. 730. 1 a. , profile view. 1 b. , falx. 2. locuples, Butl., p. 732. 2 a. , profile view. 2 b. , falx. 3. Brassus malagassicus, Butl., p. 730. 3 a. , profile view. 3 b. , palpus. 4. Ccerostris stygiana, Butl., p. 731. 4 a. , profile view. 4 b. • , view of abdomen from behind. 5. paradoxa, Dolesch, p. 732. 5 a. , profile view. 5 b. , view of abdomen from behind. 6. Pyresthesis cambridgii, Butl., p. 733. 6 a. , profile view. 6 b. , caput with eyes. 6 c. -••-, falx. 5. Descriptions of Shells from Perak and the Nicobar Islands. By Lieut.-Col. H. H. GODWIN-AUSTEN, F.Z.S., and G. NEVILL, C.M.Z.S. [Eeceived November 6, 1879.] (Plates LIX. & LX.) The shells from Perak described in this paper were collected by Surgeon-Major E. Townsend, then with H.M. 3rd Regt. Buffs, on the expedition against the rebellious Malays in 1875-76. Some of tbe smallest were found in the caves of Buket Punong or Pondong, an isolated conical limestone hill about 1000 feet high. The collection brought to Calcutta was a very extensive and most interesting one, proving the richness of the land-molluscan fauna of that portion of the Malay peninsula, and how much more still remains to be |