BY C. W. DE VIS. 109 



wide, joined by a rib to the lobe and separated from it posteriorly 

 by a deep excavation. In a much worn tooth the basal rim may 

 be almost entire and the diameters 125 : 76. 



Molars. — (PL xvii. fig. 10). Fore link obsolete or nearly so, and 

 mid link weak: lobes l)ut slightly convex anteriorly. The base of 

 the posterior concavity of m. * is enclosed by the descending inner 

 edge; an adpressed fold is therefore seen on the hinder surface of 

 the anterior molars. The difference between the widths of the 

 lobes of m.^ is greater than in the lower tooth; their ratio is 13*5 

 to 12-5. 



Ex(i7nples — three hundred and twenty-nine. 



Mawiibidar. — Of adults : Thirty-four rami with all the cheek- 

 teeth, most of them with the incisor in place — One hundred and 

 fifty-three rami or parts thereof with fewer than all the cheek- 

 teeth. 



Of young : Twenty-four rami with p. '•' and some of the follow- 

 ing teeth — Sixteen rami without p."'. 



Maxillary. — Of adults : Seventeen maxillae with all the cheek- 

 teeth, five of them being each a part of a cranium more or less 

 entire — Seventy-six maxillje or parts thereof with teeth in greater 

 or less number. 



Of young : Nine maxilla? with various teeth. 



Halmaturus dryas, n.s. 



Molars with the upper fore link well developed. Upper ^yq- 

 molar with a narrow ledge tubercular, but not transversely ribbed. 

 Lower premolars, both permanent and deciduous, like those of 

 //. anal'. Size inferior. 



Dimensions. 



Type maxillary. 



Maxillary. — In adults : The length of the entire series of cheek- 

 teeth is 04 -9 (1); of the first four 46*2 (1); of the true molar 

 series 47 '5 (1); of the first three 29-6 (1); of the premolar from 

 11-.5 to 15-0 (3). The width of m.^^ is from 9-9 to 10-3 (5). 



Mandibular. — In adults : The full series of cheek-teeth ranges 

 from 52-7 to 58*5 (3); the first four are 35-5 (1); the first three 



