452 DR. H. W. MAEETT TIMS ON THE 



o-ives rise also to a slight indication of an antero-internal cusp. This tooth has 

 but one fang. 



The second premolar (pm.^) has two fangs. It is larger than pm.i but with 

 the same characters more pronounced. In addition there is a minute cusp 

 {me) between the main cone and the posterior cingulum-cusp {cp). 



The third premolar (pm.^) has all these characters, but is larger and more 

 pronounced. It is 2-fanged. 



The carnassial (pm.*) again has the same characters, but the Protocone is 

 proportionately more marked and supported on a separate fang, although -very 

 diminutive compared with the other cones. 



The first molar (m.^) has well-marked Para- and Metacones {pa and me), the 

 former being slightly the larger. The ciugulum is traceable on the external 

 face and becomes prominent at the antero-external angle of the Paracone, in 

 front of which it is continued. At the antero-internal angle at the base of this 

 cone the cingulum divides, both portions being continued backwards sepa- 

 rately to the postero-internal angle at the base of the Metacone. On the outer 

 of these two cingulum-ridges rises the well-marked Protocone, between the base 

 of which and the Paracone is a smaller cusp (tig. 3, d). At the posterior part 

 of the outer cingulum, immediately behind the Protocone, is another cusp 

 (fig. 3, i) ; the inner cingulum has two cusps placed upon it, as shown in fig. 3, A. 



The second molar (m.^) has the same characters, but all is much smaller. 



Lower Jaw.— The description given above of the upper incisors will apply 

 equally to the corresponding teeth of the lower jaw, with the shght difference 

 that the anterior (inner) cusp is less pronounced in the latter. 



Canine. Same as in upper jaw. 



Premolars. With the exception of the fact that the cusp {hy) situated 

 between the main cone and the posterior cingulum-cusp is better marked, the 

 characters of these teeth are the same as of the corresponding teeth in the upper 



series. 



The first molar, or lower carnassial (m^), bears a high main central cone, 

 the Protoconid (fig. 2, pr'), with an exceedingly well-marked Paraconid {pa!) 

 anteriorly and shghtly internal to the Protoconid. Posteriorly to the main 

 cone is the so-called Hypoconid {hy), and at the posterior end of this the 

 cingulum forms a small cusp {cp). On the inner side of the Hypoconid the 

 cingulum is prominent and terminates anteriorly in the Metaconid {me) at 

 the postero-internal angle of the Protoconid. At the postero-internal angle 

 of the cingulum is another marked cusp, the Entoconid, between the base of 

 which and the Metaconid is another small cusp. 



The second molar ^m.^) presents the same characters, with the exception of 

 the absence of the Paraconid and that the Protoconid is scarcely higher than 

 the other cusps. 



From a consideration of these teeth, the same difficulty in 

 homologizing the Protocone is to be met with as has been 

 pointed out in the deciduous teeth. 



On external comparison of the two dentitions certain points 

 are to be noted. In the first place, there is the well-kuown fact 



