HALICORE. 149 



succession of teeth in this animal is not therefore a 

 vertical succession, but in the horizontal direction, as 

 is the case with the true molars in man, or as is seen 

 on a large scale in the molar region in the elephant. 



7. Sternum, 1st and 2nd pairs of Ribs, cervical Vertebrae, 



1st and 2nd dorsal. Sternum 8 inches long, divided 

 into two segments, the anterior 4 i inches, the posterior, 

 3^ inches, is not bifurcated at its free end : greatest 

 breadth about the middle 2f inches. Three pairs of 

 costal cartilages articulate with the sternum near its 

 middle, one and a half to the anterior segment, one 

 and a half to the posterior. Seven Cervical Vertebrae, 

 the anterior part of the head of the 1st rib articulates 

 with the side of the body of the 7th, the posterior 

 part with the body of the 1st dorsal. The tubercle of 

 the 1st rib articulates with the transverse process of 

 the 1st dorsal and not with that of the 7th cervical. 



In the immature skeleton. No. 2, the sternum, in its 

 size, form, and costal articulations, closely resembles 

 that in No. 7, and the articulations of the vertebral 

 end of the 1st rib are similar. In the adult skeleton. 

 No. 1, the sternum is bifurcated at its posterior end 

 and notched anteriorly ; its mesial length is 10 inches, 

 whilst laterally it is 11^ inches; the greatest breadth 

 is 3f inches. The vertebral articulations of the 1st 

 rib correspond with Nos. 2 and 7. The spines of the 

 atlas and axis, 3rd and 4th vertebras are ossified, but 

 in the 5th, 6th, and 7th the two halves are still 

 asunder. In the immature skeleton the atlas and 

 axis only are completely ossified. 



8. Pectoral Limbs, pair of. Scapula falciform, vertebral 



and anterior borders convex, anterior angle feeble, 

 posterior distinct, coracoid and spines present, acro- 

 mion short, pre-spinous larger than post-spinous fossa. 

 Humerus from head to outer condyl 5f inches, 

 upper epiphysis for head and tuberosities not fused 

 with shaft, lower fused, upper half of shaft broad 

 and deeply grooved. Radius and ulna each with 

 upper epiphj'sis fused, lower not j^et united ; ole- 

 cranon well marked, epiphysis on its tip not fused. 

 Radius 4| inches long, ulna 5h inches. Carpus with 

 proximal and distal rows; the proximal contains 

 radiale and ulnare but no intermedium, the distal 

 consists of a single bone stretching across the carpus 

 and articulating with five metacarpals ; between the 



