ORDER ANOMODONTIA. 



1 06] 



panded transversely to the axis of the jaws. These crowns are 

 swollen at their base, and have a low apex vertically divided into 

 two portions, of which the inner one in the upper jaw is low and 

 horizontal, and the outer forms a curved claw-like cusp — the 

 anterior teeth consisting simply of an inner ledge and the outer 

 cusp, and there being no enlarged tusks. Metarmosanrus, of the 

 same deposits, may perhaps be referable to this family. 



In the large Deiiterosaurus, from the Russian Permian, the pre- 

 maxillary teeth (fig. 983) approximate to the description of those 

 of Bolosaurus, but there are large 

 tusk-like teeth resembling those of 

 the Galesauridce behind the five pre- 

 maxillary teeth ; the nares being di- 

 vided. This genus may be regarded 

 as representing a distinct carnivorous 

 family. A tooth from the Karoo 

 system of South Africa, having the 

 general characters of the anterior 

 teeth of Deuterosaurus, but with the 

 lateral borders of the inner surface 

 of the crown forming ridges, has 

 been made the type of the genus 

 Glaridodon. An associated series of 

 bones in the British Museum may 

 belong to the same form ■ the verte- 

 brae are notochordal, and the humerus 

 agrees in size with the one mentioned 

 below as Brithopus. Here may be 

 noticed the genus Rhopalodon, from 

 the Permian of Russia, founded upon 

 a mandibular ramus which may be- 

 long to the same family. Perhaps, 

 however, the most remarkable speci- 

 men from these deposits is the distal portion of a large humerus 

 described under the name Brithopus (Eurosaurus) ; the proximal 

 end of another humerus, which has received the name of Ort/iopus, 

 probably belonging to the same species. The former specimen 

 is remarkable for having both ectepicondylar and entepicondylar 

 foramina — a condition elsewhere known only in Titanosuchus and 

 Spkenodon. Dr Baur has suggested that this specimen may belong 

 to a Rhynchocephaiian, but it is certain that it is referable, as Sir R. 

 Owen first pointed out, to the present suborder ; and it is quite 

 likely that it may prove to belong to Deuterosaurus, in which case 

 this name should be superseded. 



Family Diadectid/e. — This family is also founded upon genera 



Fig. 982. — Anterior aspect of the imper- 

 fect left humerus of Stereorliachis dom- 

 tnans; from the Lower Permian of France. 

 One-half natural size. (After Gaudry.) 



