EEYOPS. 193 



R. 576. Several associated vertebrae, two of which are represented 

 {Fig.) in woodcut, fig. 47. These specimens accord with the 

 portion of the vertebral column figured by Cope in the 

 1 Proc. Amer. Phil. Soc' vol. xix. pi. iii. The intercentra 

 distinctly show in several cases a capitular rib-facet on 

 the posterior border of their lateral surface. The close 

 resemblance of these elements to the intercentra of Ernbo- 

 lophorus (No. R. 569, p. 109) appears to be conclusive 

 that Cope is right in regarding them as the homologues of 

 the latter, and that they are not (as has been contended) 

 part of the centrum of the vertebra. 



Eryops africanus, Lydekker \ 

 Known by part of the mandible, which has an approximate length 

 of about 0,400 (15-8 inches), and apparently indicates a species 

 of somewhat smaller size than E. megaceplialus, with the sym- 

 physial teeth relatively less enlarged and the intercentrum less 

 fully ossified. The generic reference is provisional. 

 Hab. South Africa. 



R. 466. The imperfect right ramus of the mandible ; from the 

 {Fig.) Karoo system of South Africa. The glenoidal region and 

 the greater part of the dentary bone are entire, but the 

 region between the two is imperfect. This specimen is 

 the type, and the dentary region is figured by the writer 

 in the ' Quart. Journ. Geol. Soc' vol. xlvi. pi. xii. fig. 2. 

 The absence of a postarticular process is clearly shown. 

 To the inner side of the alveolar tract the surface of 

 the bone carries a band of minute denticules precisely 

 similar to those found in the mandible (No. E. 570 a, b) 

 referred to Eryops megaceplialus (p. 192) ; and there are 

 no characters by which the present specimen can be 

 generically distinguished from the latter. 



Presented by Sir JR. Owen, K.C.B., 1884. 



R. 470. An intercentrum, apparently associated with the pre- 

 ceding ; from South Africa. Noticed by the writer in the 

 ' Paheontologia Indica,' scr. 4, vol. i. pt. iv. p. 10, where 

 it is referred to Rhytidosteus ; and figured in the ' Quart. 

 Journ. Geol. Soc' vol. xlvi. pi. xii. figs. 3, 4. This 

 specimen is rather smaller than the intercentra (No. R,. 

 576) of Eryops megace_phtdus, and therefore agrees in 

 relative size with the mandible ; it is also less ossified 

 1 Quart, Journ. Geol. Soc. vol. xlvi. pt. 2 (1890). 



