442 Zoological Society : — 



Emyda senegalensis, Gray. 



Cryptopxis senegalensis, Dum. & Bibr. 



In spirits. Grey ; beneath, white. Head above with many sym- 

 metrical roundish white spots, and a short white streak in the centre 

 of the crown ; upper part of the neck with symmetrical white mar- 

 bling. Upper shell grey, with small round scattered black spots, 

 with a distinct central keel, which is rather broad and smooth in 

 front, becomes suddenly narrow, and is converted into a series of close 

 tubercles at the middle of the ba*ck. Back with rather irregular, 

 often interrupted, somewhat concentric lines of small tubercles, which 

 converge towards the central keel behind, and with a number of 

 larger, isolated, but rather crowded tubercles on the middle of the 

 J front edge ; sternum blackish, white on the margin. 



Sab. Senegal. 



On New Reptiles and Fishes from Mexico. 

 By Dr. Albert Gunther. 



A collection of Reptiles and Fishes made by one of the correspond- 

 ents of M. Salle in Mexico, and purchased for the British Museum, 

 contains, besides many other scarce species — as Cubina grandis, Gray, 

 Gerrhonotus imbricatus and tessellatus, "Wiegm., Geophis (Cato- 

 stoma) chalybcea, Wagl. (scales keeled), Conopsis nasus, Gthr., Za- 

 menis mexicanus, D. & B., Atropus undidatus, Jan, &c, — the fol- 

 lowing new species. 



SAURIA. 



Mabouia brevirostris. 



Diagnosis. — The snout (from the anterior margin of the eye) is a 

 little shorter than the width between the orbits. Twenty-four lon- 

 gitudinal series of scales round the middle of the trunk, two entire 

 and two half series along the back between the white streaks. Two 

 large anal shields in front of the vent, with a small additional one on 

 each side. A series of large shields along the lower part of the tail. 

 Back brown, separated from the sides, which are black, by a white 

 streak, running from the snout, above the eye, to the origin of the 

 tail, where it is gradually lost. Another streak, less distinct, borders 

 the lower lip, and the black coloration of the side. Belly whitish, 

 the centre of each scale being minutely dotted with greyish. 



Hab. Oaxaca (Mexico). 



The general arrangement of the shields of the head being the same 

 as in Mabouia agilis, it does not appear necessary to give a detailed 

 description of them. The present species is very similar to the latter, 

 but distinguished by a considerably shorter snout. The large scales 

 on the back and the large anal shields are sufficient characters to 

 distinguish it from M. Lacepedii, &c. 



OPHIDIA. 

 Leptodeira discolor. 



Diagnosis, — Anal bifid ; scales in nineteen rows. Posterior maxil- 



