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APPENDIX. 



The deflected symphysis of the lower jaw is also longer 

 in proportion to its antero-posterior extent in Halicore 

 australis (fig. 3). There are some minor differences in the 

 cranium; but the general structure and configuration of 

 this part of the skeleton is closely similar in both species. 



With regard to the rest of the skeleton, the scapula 

 (fig. 5) best exemplifies the specific distinction of the 

 Halicore australis. 



Fig. 5.— Blade Bone, Australian Dugong. 



Fig. 6.— Blade Bone, Indian Dugong. 



This is seen in the minor breadth as compared with the 

 length of the bone, arising chiefly from the straighter 

 anterior costa, which in Halicore indicus (fig. 6) describes 

 a bold convexity ; and this character is as well manifested 

 in the young Indian Dugong, whose skeleton is figured in 



