9 



Measurements. M. 



-r.. . c r. . . t , (antero-posterior 006 



Diameter of first tubercular^ ' 



•. transverse 005 



Antero-posterior diameter second tubercular 0037 



Length of base of superior sectorial 009 



" bases of two tuberculars 012 



" base of first tubercular 0064 



Canis geismarianus, sp. nov. 



Tbis species of dog may be placed with reference to the size of its infe- 

 rior sectorial tooth between the G. lippincottianus and G. hartsliomianus. 

 In tbe robust proportions of this tooth it more nearly resembles the G. 

 euspigerus. Tbe mandibular ramus is robust and shallow, and quite dis- 

 tinct from the deep jaw Of G. hartsliomianus. Tbe sectorial has perhaps 

 twice tbe bulk of those of the G. lippincottianus and G. euspigerus. From 

 that of the latter it differs further in the small inner tubercle and con- 

 tracted heel. 



The sectorial part of the tooth is relatively small, not exceeding the heel 

 in length, and its cusps are low. The heel is notable for the elevation of 

 the tubercle of the inner side — which exceeds that of the outer ; the latter 

 also, is contracted, standing within the external base, which is represented 

 by a short cingulum. A weak cingulum below the sectorial blades. Sur- 

 face of the enamel rugose where not exposed to friction. 



Measurements. M. 



f vertical, anterior cusps 006 



I " heel 0038 



Diameters of sectorial •{ 



antero-posterior 0115 



transverse, middle 006 



Depth ef ramus at sectorial 012 



Thickness of " " 007 



I 



The affinities of this species are evidently with the G. euspigerus. It is 

 named in honor of Jacob Geismar, a skillful naturalist of Philadelphia. 



Mach^erodus strigidens, sp. nov. 



This obviously distinct species is only represented by the crown of a 

 superior canine tooth, from which the apex has been broken. Its characters 

 are so peculiar that I record it under the above name, r.ot knowing whether 

 I shall have better specimens. 



The tooth is long and very much compressed, much more so than in any 

 species of the genus known to me. Its anterior and posterior edges are 

 finely and very perfectly denticulate without lateral flexure near the base. 

 The centre of each side of the tooth is occupied by a wide open gutter, so 

 that the greatest transverse diameter of the crown is not at its middle. 

 These gutters become planes towards the apex, giving an elongated hex- 

 agonal section. The size indicates an animal of the proportions of the 

 M. primmmis, and smaller than the M. brachyops. 



