Dr. J. E. Gray on Tortoises. 145 



Head olive, with a narrow longitudinal central streak on the 

 upper part of the nose, a narrow white streak from the upper 

 part of the nostrils to the front of the orbit, and a narrow white 

 streak from the upper part of the nose, continued along the 

 side of the crown over the orbit and the outer side of the tem- 

 poral muscles to over the tympanum. 



The shell olive above, with a distinct oblong, broad, pale 

 streak over the middle of the areola of the costal plates. The 

 sternum and underside of margin blackish, with a broad yel- 

 lowish white band (perhaps bright red when alive) down each 

 side of the sternum. There is a pale mark on the middle of 

 each marginal plate, more distinct on the hinder plates. 

 Under surface and side of face and neck whitish ; side of neck 

 punctulated with black. 



This species has the peculiar pale spot which was previously 

 regarded as characteristic of Rhinoclemmys mexicana ; but it 

 has quite a different head. 



6. Rhinodemmys mexicana. 

 Rhinoclemmys mexicana, Gray, P. Z. S. 1870, p. 659, f5g. (head), 1871, 

 p. 296, t. 28. 



IV. Shell blackish, with more or less distinct pale rays; underside blacJc, 

 with a pale band round the margin, and pale triangular spots 

 on the underside of the front and hinder marginal plates ; nose with 

 a central longitudinal streak ; crown white-van^ ; sides of head 

 with a diverging black-edged streak. 



7. Rhinoclemmys annulata, Gray, I. c. fig. 5 (head). 

 Hab. Ecuador. 



8. Rhinoclemmys pidcherrima. 



I described and figured a young specimen of a freshwater 

 tortoise in the British Museum, said to have come from Mexico, 

 under the name of Emys pulcherrima, Cat. Shield Rept. p. 25, 

 t. XXV. f. 2. The large cavity in the centre of the sternal 

 bones, like what is found in the young Rhinoclemmys, and the 

 short scarcely webbed toes make me think that it is most likely 

 a Rhinoclemmys, or at least very nearly allied to it. The spe- 

 cimen is very young, the marginal bones being very rudi- 

 mentary and only slender, half-ovate. It must be the young 

 state of a very large species. 



The alveolar surface of the jaws appears to be like that of 

 Rhinoclemmys ; but the colouring of the back is very different 

 from that of any known species, and may indicate a new genus. 



9. Rhinoclemmys ventricosa. 



Shell oblong, broad, ventricose. Back swollen on the sides. 

 Ann. & Mag. N. Hist. Ser.4. FoZ.xi. 10 



