1835.] Mr, Gray on the Genera of Reptiles i \%^ 



genus Anguis, thus showing that he considered them as nearly 

 allied. So far the passage from one order to the other has 

 been very easy and gradual ; and indeed sometimes I have been 

 doubtful, as in the last case, to which order I should refer 

 the genera. There is every reason to believe from general 

 structure, that there exists an affinity between the tortoises and 

 the snakes, but the genus that exactly unites them is at pre- 

 sent unknown to European naturalists, which is not astonishing 

 when we consider the immense number of undescribed animals 

 which are daily occurring. 



Mr. Macleay thought these tw^o orders might be united 

 by means of Emi/s Longicollis (the long-necked tortoise) of 

 Shaw ; but the family to which this animal belongs appears to 

 be the one which unites this class to the crocodile : if I may be al- 

 lowed to speculate from the pecuharities of structure which I have 

 observed, I am inclined to think that the union will most proba- 

 bly take place, by some newly discovered genera, allied to the 

 marine or fluviatile soft-skinned turtles, and the marine serpejit. 



§ 1. Body covered with imbedded hard plates ; legs distinct, fit 

 fox walking, Loricata, Gray; not Merrem, 



,,_. Order I. Emydosauri, Blainv. - 



f" Ears closed by two longitudinal valves ; anus longitudinal ^ 

 body covered with large imbedded plates ; tongue short adnate ; 

 legs four ; toes four before, five behind ; sternum long ; clavi- 

 cles none ; lungs not extended to the abdomen j living in or near 

 water. 



Fam, I. Crocodilid^. • 



Feet three clawed; hinder ones ; palmate or semi palmate r 



tail compressed. k 



1. Ali GATOR, Cuv. ^ 

 Head blunt; hind feet semi-palmate. America, -^ 

 A. lucius, Gray. Crocodilus lucius, C2^v. i 



2. Crocodilus, Cuv, Champse, Merrem. 



Head blunt ; hind feet palmate. Old and Ne^.^ Qqntinenf^^....,^ 

 ^ C. biscutatus, Cmu. 



3. Gavial, Oppel, Gavials, Cuv, 



Head very long ; hind feet semi-palmate. Old Continent, 

 G. gangeticus, Gray, Crocodilus gangeticus, Cuv, 



Fam, n. ICTHIOSAURID^. 



Feet paddle-shaped; toes five; cervical vertebra 18. Marine, 



1. IcTHiosAURUs, Kanig, Proteosaurus, Home. 

 Teeth in a grove. 



Latreille apphed the name Ichiosanrus to the larva of a sala- 



o2 



