Dr. J. E. Gray on new species of Freshwater Tortoises. 265 



their eroded and discoloured adult state arc so alike as to be mistaken 

 for one another. 



They may be thus described : — 



1. KiNOSTERNON PeNSYLVANICUM. 



Head brown-dotted ; temples with two parallel distant streaks oi' 

 white spots, from the upper and lower edge of the orbit, and a third 

 streak across the lower jaw ; neck white-dotted ; back deep brown ; 

 lower side of marginal shields, the axillary and inguinal plates and 

 each of the sternal plates with a large yellow spot ; sternum broad, 

 rounded before and behind. 



Hal/. North America, Florida, £. Doubleday, Esq. 



2. KiNOSTERNON HiPPOCREPIS. 



Head brown, with a broad white streak on each side, from the end 

 of nose over the eyebrows to the sides of the nape ; back j)ale and 

 sternum brown ; dorsal shield with a single apical and some scattered 

 black spots ; under side of each marginal and sternal plate rather- 

 paler in the middle ; sternum rather broad, rounded in front and 

 slightly truncated behind. 



K. Pensylvanician, Holbrook, N. Amer. Herp. t. 21. 



Hab. North America, New Orleans, E. Boubleday, Esq. 



3. KiNOSTERNON PUNCTATUM. 



Head brown, minutely white-dotted, without any streaks ; the back 

 brown, discal shield with a very distinct apical, and some scattered 

 black spots ; margin with a very narrow white line ; under side whitish, 

 with minute scattered black dots and line ; sternum narrow, con- 

 tracted at each end, and with straight sides behind, rather truncated 

 in front and more distinctly and broadly so behind. 

 Hab. North America. 



There are several specimens of the first species of different ages 

 from various parts of the States, in the British Museum ; I have 

 therefore retained for it the more general name ; and two young 

 specimens and a half-grown one of the second species, and only a 

 single young specimen of the third species ; the latter is so distinct, 

 by the narrow form of its sternum, from the other two, that it might 

 be referred to the genus Aromochelys if the pectoral plates were not 

 triangular ; it may be considered as the species passing towards 

 that genus, and I should think that the adult animal must differ 

 considerably from the common form of K. Pensylvanicum. 



Aromochelys. 



The Musk Tortoise, or, as it is more commonly called, the Stinkpot of 

 North America, is easily distinguished from the other Kinosterna by 

 the narrowness of the sternum and the humeral plates being square, 

 like the pectoral one, instead of triangular, as they are in K. scor- 

 poidcs and K.Peiisyhauicum. For this reason 1 have proposed to 

 divide them into a distinct group under the name of Aromochelys. 



I am the more inclined to do so, as there are two most distinct 

 species in the British Museum Collection, which have either been 



