36 ANOMODONTIA. 



47342. The imperfect skull of a younger individual, apparently 

 {Fig.) referable to this species ; from the Beaufort beds of the 

 Rhenosterberg. The type of P. alfredi; figured by Owen 

 in the ' Phil. Trans.' for 1862, pis. xix., xx., and also in 

 his * Catalogue,' pi. 50. Allowing for the difference of age 

 and its somewhat crushed condition, there appear to' be no 

 characters by which the present specimen can be specifi- 

 cally distinguished from the type. The absence of the 

 frontal tubercles found in the type of P. declive is well 

 shown. 

 Presented by EMM. the Duke of Edinburgh, E.G., 1862. 



Ptychosiagum microtrema (Seeley 1 ). 



Syn. Dicynodon microtrema, Seeley 2 . 



Dicynodon (Tropidostoma) dunni, Seeley 3 . 



Imperfectly known. Apparently allied to the type species, but 

 the parietal bar longer ; the parietal ridges of the interparietal 

 either closely approximated or united, and the occiput deeply de- 

 pressed above the foramen magnum. The angle formed by the 

 planes of the occiput and parieto-frontal region is more acute than 

 in the type. 



This species appears to have attained a larger size than either of 

 the preceding. 



Hab. South Africa. 



R. 868. The imperfect occipital region of the cranium ; from the 

 {Fig.) Karoo system of the Gouph district, near Beaufort West, 

 on the southern flank of the Nieuwveldt range. The 

 type ; figured by Seeley in the ' Phil. Trans.' for 1889, 

 pi. xi. figs. 1, 2. This specimen agrees approximately in 

 size with the type of P. declive, from which it is at once 

 distinguished by the longer parietal bar and the extremely 

 narrow channel between its two lateral elements. In 

 P. declive the length of that bar is 0,036 (1*38 inches), 

 whereas in the present specimen the corresponding length 

 to the line of fracture is 0,060 (2-35 inches). Both 

 quadrates are wanting. 



Purchased from T. Bain, Esq., 1880. 



R. 1662. The nearly entire occiput of a larger individual ; from 

 the Gouph district. The parietal ridges of tho inter- 



1 Phil. Trans, for 1889, p. 228. —Dicynodon. 



2 Loo. cit. 3 Ibid. p. 232. 



