54 EMYDOSAURI. 



Rhinoceros Turtle, Shaw Zool. t. 14. Test, nasicornis, 

 Lacep, Caretta nasicornis, Merrem. 



j3. OUvacea, Scutellis vertebralibus 6. Chelonia oliva- 

 cea, Esclischoltz, Zool. Atl. t. 3. 



Habitat in Mari Mediterraneo, et Oceano Atlantico, 

 /3. China. 



Eschscholtz says, that the variety has always 6 vertebral 

 plates ; it may be a distinct species, but the number of 

 plates in this family does not form generally good specific 

 characters. 



Chelonioe Fossiles, Cuv. Os. Fos. v. 239. 



a. Chelonia Hofmanni. Chelonie de 3Iaestricht, Cuv. Os. 

 Fos. v. 239, t. 14, f. 1, 2, 3 ; t. 13, f. 2, 3 ; t. 16, f. 6, 7. 

 Elk Horns, Faujas, St. Pierre, t. 10, f. 3. 



li. Chelonia Kjiorri. Chelonie de Glaris, Cuv. Os. Fos. 

 V. 243; Knorr, t. 1, f. 34; Andrea's Lettres Suisses, t. 16, 

 cop. Cuv. Os. Fos. t, 16, f. 4. 



c. Chelonia Cuvieri. Chelonie de Luneville, Cuv. Os. 

 Fos. V. 525. 



Order II. EMYDOSAURI. 



Vertebrae dorsi costseque mobiles ; vertebrae colli 7, fere 

 immobiles ; sternum angustum longum; claviculce nullse; 

 pulmones abdomen non intrantes; osdentatum,dentibusconi- 

 cis in foveis insertis deciduis. Tympanum valvula mobili 

 tectum; pedes digitati; penis simplex perforatus; vesica urinaria 

 nulla; anus rimeeformis longitudinalis. 



The Crocodiles formed only a species of the genus Lacerta 

 in the Linnean System. Gronovius made them into a genus 

 under the name of Crocodilus, and Oppel named the group 

 Crocodilini, while Merrem formed them into an order under 

 the denomination oi Loricata. M. De Blainville has proposed 

 for the group the name of Emydosauriens, which has been 

 generally adopted. 



Their head is depressed, and covered with numerous 

 small shields ; their mouth is large, and furnished with a 

 single row of large teeth, which are conical, acute, longi- 

 tudinally striated, and inserted in pits in the edge of the 



