292 Synopsis of the Siwdlik Fossils [May, 



the entries admitted into these columns are based may be deemed 

 interesting, the following- headings under which the specimens were 

 counted off are also given. 



Cranivws, which title includes all specimens showing a considerable 

 portion of the head. 



Upper Jaws. Allotted to such palates as possess either one or 

 both lines of molars complete. 



Lower Jaics. Under this heading are numbered those lower jaws 

 which are perfect, and also such as, though wanting the symphisis, 

 present the line of molars complete. The shape of the lower jaws of 

 the ruminantia renders them very liable to fractui'e immediately in 

 front of the molars ; accordingly, a great number of half jaws are 

 found, which, being deprived of their symphisis, afford no means of 

 aecurately joining together such of them as may have belonged to the 

 same individual. Some pairs may therefore have been overlooked ; an 

 error nearly inevitable, and which would account for the apparent 

 excess of lower jaws in proportion to the upper. 



Fragments of Upper and of Lower Jaws. Within these columns, as 

 the heading imports, fragments of maxillaries, containing one, two, or 

 more molars, and also those detached molars, the maxillaries of which 

 are not in the collection, have been ranged. 



As the table enters into no detail of species, the latest discoveries 

 which it comprises may be cursorily noticed. These are a very perfect 

 cranium and lower jaw of a species of Vulpes ; an equally perfect cra- 

 nium and lower jaw of a species of the genus Gulo ; also an addi- 

 tion to the Pachyderma, consisting of the anterior half of a head, of 

 which the posterior half was unfortunately broken off ; and owing to 

 the carelessness of the excavators, none of the fragments have hitherto 

 been recovered. The lower jaw is locked within the upper ; so that 

 the exterior surface, and the outline of the upper molars can alone be 

 examined ; the characteristics of the teeth being thus imperfectly deve- 

 loped, and the occiput wanting altogether, the specimen has been 

 inserted in the table under the general title " Cuvierian Pachyderma :" 

 by which, however, there is no intention of conveying the idea that it 

 has been identified with any of the Pachydermata of the Paris basin ; 

 for although it affords some analogies both to the Pala?otherium and 

 to the Anoplotherium, its essential peculiarities are sufficiently remark- 

 able to cause it to be separated from either genus. 



In the present early state of the search, the accompanying list can 

 only be considered as an approximation to the relative numerical pro- 

 portions in which the different fossil genera existed. Viewed as such, it 

 tends to prove that species of the genera Elephas, Mastodon, Hippo- 

 potamus, Cervus, Antilope, and Bos, were abundant ; that the genera 



