426 CLASS REPTILIA. 



The head is articulated by two condyles, on an atlas of no 

 great capacity of motion. The vertebrae are altogether ten 

 in number. The eight which are extended from the nape to 

 the pelvis, are furnished with pretty long transverse processes, 

 which, in the last vertebra, extend as far as the bones of the 

 ilia. 



The sacrum is long, pointed, and compressed, and there is 

 no coccyx. 



The coxal bones are united into a single piece in the adult 

 subject. Their iliac portion is very much elongated. The 

 ossa pubis and the ischia being short, and synostosized into 

 a single solid piece, form a crest more or less rounded at the 

 place of their symphysis. There is no foramen formed by 

 these bones. 



No traces of ribs are at all visible. 



The sternum forms in front a cartilaginous appendage, 

 terminated by a disk situated under the larynx. It after- 

 wards receives the clavicles. Then it widens, and finally 

 terminates by another disk placed below the abdomen, and 

 serving" for the attachment of the muscles. 



The bones of the furca, and the clavicles are on each side 

 intimately united on one part to the sternum, and on the 

 other to the omoplate. There is nothing very peculiar in 

 bones of the arm. 



The carpus is formed of eight bones, in three ranks ; two 

 bones in the first, and three in the second and third ranks. 

 The largest bone in the second range bears the rudiment of 

 a thumb with two articulations. The two toes which follow, 

 have each two phalanges, and the two others three each. 



There are no trochanters in the femur. The osseous piece 

 which follows the femur is a peculiarity in the skeleton of 

 tailless bactracians, and is longer in the frog than in the toad. 

 The majority of anatomists have been wrong in considering 

 this as a representative of the two bones of the leg. These 



