DEUTEROSAT7IU7S. 99 



by Meyer in the ' Pakeontographica,' vol. xv. art. 3, pi. xv. 

 figs. 5-7 (1866). Another figure is given by Owen in the 

 ' Quart. Journ. Geol. Soc' vol. xxxii. p. 353, fig. 1, in 

 conjunction with the proximal extremity of the humerus 

 on which Orihopus was founded. The specimen is also 

 figured by the present writer in the ' Proc. Zool. Soc' 1889, 

 pi. lv. fig. 4, with a restoration of the imperfect postaxial 

 border. Purchased, 1865. 



Genus DEUTEROSAURUS, Eichwald \ 



Founded upon a portion of the vertebral column 2 , which appa- 

 rently closely resembles that of the African form mentioned above. 

 The skull referred to this genus by its describer indicates a consi- 

 derably larger individual than the one to which the vertebra? belonged ; 

 and since the humerus of Briihopus is proportionately somewhat 

 larger than those vertebrae, there would be more reason for referring 

 the skull to that genus. In the absence of any decisive evidence 

 one way or other and bearing in mind that Deuterosaurus may be 

 generically identical with Brithopus, the teeth of the above-mentioned 

 type are noticed under the present heading. 



The above-mentioned skull has the incisive teeth -J in number, 

 and comparative small tusks ; the number and contour of the cheek- 

 teeth being unknown. In the incisives (fig. 19) the crowns have 

 a claw-like outer cusp, with a well-developed basal inner ledge ; 

 their roots are laterally compressed, with a pulp-cavity of moderate 

 size. 



Deuterosaurus biarmicus, Eichwald 3 . 



The type and only described species. The typical vertebral column 

 indicates a smaller individual than the African form mentioned on 

 p. 96 ; but the teeth and skull which have been referred to this 

 species are of relatively larger dimensions. 



Hob. Kussia. 



R. 303. A somewhat imperfect incisive tooth of the same type as 

 {Fig.) the incisives of the skull referred by Eichwald to this form ; 

 from the Upper Permian of the Kargalinsk copper-mines, 

 Government of Orenburg. Described and figured by 

 Twelvetrees in the ' Geol. Mag.' dec. ii. vol. ix. p. 338, 

 pi. viii. fig. 2 (188.2), and again by Seeley in the ' Proc. 

 Koy. Soc' vol. xliv. p. 136, fig. 1 (1888) ; the specimen 



1 Bull. Soc. Moscou, vol. xxi. No. iii. p. 151 (1848). 



2 Figured in ' Lethaea Eossica,' pi. lix. 3 Zoo. cit. 



h2 



