278 ZOOTOMY. 



incisors, except that they are not grooved anteriorly. In 

 the position of rest they fit against the posterior upper 

 incisors. 



78. The absence of canines, or teeth situated imme- 

 diately behind the premaxillo-maxillary suture. 



79. The premolars : three on each side of the upper 

 jaw (in the maxilla), two on each side of the lower jaw, and 

 separated by a long interval or diastema from the incisors. 

 They are long curved teeth, devoid of fangs. The first 

 tooth in the upper jaw is small and quite simple: the 

 remaining two are marked externally with a longitudinal 

 groove, separating two well-marked ridges : their crowns 

 present two transverse grooves bounded by ridges. In the 

 lower jaw the first premolar has two grooves and three 

 ridges, the second resembles those of the upper jaw. 



80. The molars, three on each side of each jaw, and 

 closely resembling the upper premolars, except that the last 

 in each jaw is small and simple. 



IX. In the shoulder-girdle and fore-limb note : 



81. The scapula, a flat triangular bone, lying, in the 

 natural position, external to the anterior ribs, its apex being 

 over against the first rib, and the long axis, drawn from its 

 apex to its base, inclined upwards and backwards. The 

 base of the triangle consists, in the recent state, of a strip 

 of cartilage, the supra-scapula ; its apex is formed by the 

 smooth concave glenoid cavity for the articulation of 

 the humerus : immediately anterior to this latter is a small 

 inwardly curved coracoid process, consisting in the 

 young animal (six weeks) of two separate ossifications and 

 representing the coracoid of the lower Vertebrata : of 

 these ossifications the pre-axial goes mainly to form the 

 coracoid process, the post-axial is a small nodule bearing a 

 facet which forms the anterior part of the glenoid cavity. 



