1853.] 393 



This is the largest species of Hycenodon which has yet been discovered, the 

 skull measuring one (cot in length, whilst the length of the anterior cusp of the 

 last upper tnolar or carnassial tooth is one inch in length: and the inferior car- 

 nassial tooth measures fifteen lines antero-posteriorly. The series of lower molars 

 closely resemble those representee! in the upper left figure of plate XVII of 

 Blainville's " Subursi antiqiii" {Oat. Gen.) and the superior carnassial tooth is 

 like that represented in figures 3 3b. pi. XI. of Gervais' Zoologie Frangaise. 



D/Lfasuremeiits. 

 Length from occipital condyle to incisive teeth 

 Breadth of face at superior carnassial teeth 



" *' " canines 



" forehead at supra orbital processes 



Depth of lower jaw at inferior carnassial tooth 

 Length of crown of upper canine anteriorly 



' " lower " " 



" series of upper molars 



" " lower " 



2. Hy.enodon CRriENTUS, Leidy. The second species is about the size of the 

 Ilyaanodon lejitorhyHchns^ Laizer and Parieu.* It is founded upon a portion of 

 the left side of a lower jaw, containing the root of the canine, and the third and 

 fourth molars and the carnassial tooth. 



Meas n rements . 

 Length of the lower molar series - 4 in. 6 1. 



Antero-posterior diameter of inferior carnassial tooth 10^ I. 



3. Hy.exodox crucians, Leidy. The head of this species was almost the 

 size of that of the Prairie Wolf. The specimen upon which the species is founded 

 consists of the greater portion of a scull, containing on one side the posterior five 

 molar-, and on the other the anterior three molars, and of a lower jaw containing 

 all the molars on both sides except one. 



]Meas2irevient!t . 

 Length of head from post glenoid tubercle to anterior part 



of the upp^r canine 

 Lenith of series of upp.^r molars 

 Leoiith of anterior cusp of superior carnassial tooth 

 Antero-posterior diameter of inferior carnassial tooth 

 D-pth of lower jaw below the " " ' 1 " 



Length of crown of an upper canine anteriorly 11 *' 



1. Daphoenus vetus, L'idy. This new genus and species is proposed upon 

 a specimen of a cranium without the face, a fragment of a left upper maxilla con- 

 taining the posterior three molars, the posterior portion of the left side of the 

 lower jaw containing the last two molars, and a lower ante-penultimate molar of 

 the right side. 



The cranium is elongated and narrow and possesses very much the form of that 

 of the recent Paradoxar/"!. The glenoid articulation is transversely concave 

 as in the weasels, etc. The auditory bullae are comparatively small. Of the 

 superior posterior three molars, the last is the smallest, and has a simple oval 

 crown ; the penultimate is second in size and resembles that of the wolf, but is 

 broader in relation to its antero-posterior diameter; and the ante-penultimate is 

 the largest, and also resembles that of the wolf, but is more trilateral, relatively 

 broader compared with its antero-posterior diameter, and has less elevated 

 tubercles. 



Of the inferior posterior three molars, the last is smallest and very like that 

 of the wolf; the penultimate is next in size, and has an oval crown as in the wolf, 

 but has much less elevated tubercles; and the ante-penultimate, which is the 

 largest, in relation to the size of the animal, is much smaller than in the wolf, 

 but it has the same general form ; presenting a broad heel behind, worn oflf flat 

 in the specimen, and three lobes anteriorly, having the same relation to one an- 



* An. des Sc. Nat., 2 ser. xi, 1839. 



