148 Dr. J. E. Gray on Tortoises. 



in each plate. There is no doubt that the lines in T. Uneata 

 are a moditication of this form : but the ends of the loops do 

 not exist ; for they would be out of the margin of the plate. 



Callichelys concinna, n. sp. 



Head elongate, chin convex. Shell very ventricose, longi- 

 tudinally rugose on the costal plates ; brownish olive, with a 

 roundish, dark, solid spot on the hinder angle of the fourth 

 costal, and on the suture of each marginal plate both above and 

 below. 



Ilab. San Mateo, Tehuantepec : freshwater lagoons. 



Length of shell 12 or 11^ inches. 



This species is very like Callichelys ornata ; but the head is 

 longer, and neither of the two specimens has any dark areolar 

 spot on the hinder edge of the dorsal plates, and the spots on 

 the margin are solid and not ringed. The upper jaw is notched 

 in front. The shell is ventricose like Pseiidemys ventricosaj 

 but quite differently marked. 



Davionia Eeevesii. (Hairy Tortoise.) 

 Dr. William Lockhart in 1865 presented to the museum a 

 young freshwater tortoise, which is closely covered with a long, 

 simple, filiform species of Conferva, from the Kiu-Kiaug 

 Yangtse. 



These tortoises have excited considerable interest from their 

 having been figured by the Chinese in their books and on their 

 paper-hangings, and have been regarded by some naturalists 

 as a very peculiar animal, — in fact a hairy reptile. They 

 are figuied on the titlepage of Temminck and Schlegel's ' Fauna 

 Japonica;' but they are only a freshwater tortoise or terrapin, 

 with a species of simple Conferva parasitic on their backs. 

 They are collected and much esteemed in China ; and an 

 account of them has been reprinted from Cooper's travels in a 

 former volume of this Journal (1871, vol. viii. p. 72). 



I have abstained from describing this species, in the hope 

 that I might obtain a more fully developed specimen ; but it is 

 of little consequence, as the characters of the genera do not 

 alter during age, though the species modifies its form ; but the 

 rules of these modifications are well understood, and the young 

 animal shows tlxe markings of the head more distinctly. I 

 have no doubt that it is a very young state of a tortoise which 

 the late Mr. John Reeves brought from China many years ago, 

 and which I figured in the 'Illustrations of Indian Zoology' 

 under the name of Emys Reevesii. It is now called Damonia 

 Reevesii. We at first only received specimens about 3 inches 

 long ; but now they are brought over nearly as large again. 



