18538.] 393 
This is the largest species of Hy@nodon which has yet been discovered, the 
skull measuring one foot in length, whilst the length of the anterior cusp of the 
last upper molar or carnassial tooth is one inch in length: and the inferior car- 
nassial tooth measures fifteen lines antero-posteriorly. he series of lower molars 
closely resemble those represented in the upper left figure of plate XVII of 
Blainville’s ‘* Subursi antiqui?? (Os¢. Gen.) and the superior carnassial tooth is 
like that represented in figures 3—3b. pl. XI. of Gervais’ Zoologie Francaise. 
Mvasurements. 
Length from occipital condyle to incisive teeth 12 in. 
Breadth of face at superior carnassial teeth AN Go 
ce OG ce canines 2 6 3 lines 
Fs forehead at supra orbital processes A UG (Gh 
Depth of lower jaw at inferior carnassial tooth 1 Rats ee 
Length of crown of upper canine anteriorly neta ers TNs AGS 
66 66 lower §¢ 66 Q “6 6G 
6¢ series of upper molars GH) TD) SO 
ce ‘6 lower ‘S¢ 5 ss Q <« 
2. Hymnopon cruentus, Letdy.—The second species is about the size of the 
Hyenodon leptorhynchus, 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. 
Measurements. 
Length of the lower molar series A ting 3h 
Antero- “posterior diameter of inferior carnassial souk 103 1. 
3. Hynxopon crucians, Leidy.—The head of this species was almost the 
sizeof 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 
molars, and on “the other the anterior three molars, and of a lower jaw containing 
all the Teele on both sides except one. 
Measurements. 
Length of head from post glenoid tubercle to anterior part 
of the upper canine 5 in. , 
Length of series of upper molars Bi Gor Bia 
Length of anterior cusp of superior carnassial tooth Bey & 
Antero-posterior diameter of inferior carnassial tooth Cae 
Depth of lower jaw below the <« Ke “6 Wace 
J,ength of crown of an upper canine anteriorly Lb bai 
1. Dapsornus vetus, Leidy.—This new genus and species is proposed upon 
a specimen ofa 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 Paradoxurus. The glenoid articulation is transversely concave 
as in the weasels, etc. The auditory bulle 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 anoval crownas 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 off flat 
in the specimen, and three lobes anteriorly, having the same relation to one an- 
* An. des Sc. Nat., 2 ser. xi, 1839. 
N 
