DICYXODONTIDiE. 49 



Specimens op TTxcertaix Gexeeic Position. 

 a. (Ptychognathus [?] pusittus, Owen 1 .) 



R. 1691. Slab showing the dorsal aspect of six lumbar vertebras 

 (Fig.) and of the sacrum and ilia of a small Dicynodont ; from 

 the Karoo system of the Cape Colony. Described by Owen 

 in his ' Catalogue of the Fossil Reptilia of S. Africa/ 

 pp. 54, 55, without name, and figured in pi. liii. fig. 1 of 

 the same, under the name of Ptychognathus (?) pusillus, of 

 which it must be regarded as the type. 



Presented by the Directors of the Museum at Cape Town. 



b. (Cirognathus cordylus, Seeley 2 .) 



The undermentioned specimen probably belongs to a young 

 Dieynodon, the alleged difference in the characters of the humerus 

 from other Dicynodonts being due to a comparison of its preaxial 

 aspect with the palmar aspect of the other forms and there being 

 no evidence to support the alleged reduction in the number of the 

 phalangeals. 



49413. Slab of rock showing the imperfect bones, or their impressions, 

 {Fig.) of the skull and the anterior region of the postcephalic 

 skeleton ) from the Karoo system of Klipfontein, Eraser- 

 burg, near the northern frontier of the Cape Colony. 

 Described and figured by Seeley in the ' Phil. Trans.' for 

 1888, pp. 487-501, pi. lxxv., a restoration of the skeleton 

 being given in pi. lxxvi. This specimeu is the type of 

 Cirognathus. The fragment of the scapula is described as 

 closely resembling the corresponding bone of Cisteceplialus 

 ■macro rhinus, No. 47071 (p. 46) ; but the humerus, which 

 is mainly indicated by the impression, is stated (I. c. 

 p. 496) to be distinguished from the corresponding bone 

 of the latter specimen "in a much less development of 

 the radial crest, which is more proximal in position, and 

 continuous with the articular head of the bone." In the 

 humerus of Cistecephalus it is, however, the palmar or 

 ventral aspect which is exposed (as in fig. 13 A, p. 53), 

 whereas in the humerus of the present specimen the impres- 

 sion of the preaxial aspect is preserved. The contour of 



1 Cat. Foss. Kept. S. Africa, pi. liii. (1876). 



2 Phil. Trans, for 1888, p. 487. — Keirognathus. 

 PAET rv. E 



