650 MR. R. BROOM ON ANOMODONT REPTILES 



The following- ai^e the principal measurements of the type 



skull :— 



Greatest antero-posterior length 128 mm. 



Width across squamosals 88 ,, 



Intertemporal width 22 „ 



Interovbital width 21 ., 



Width across maxillary bosses 52 ,, 



Width between nostrils 3 5 , , 



Width between canine I'oots 32 ,, 



Dicynodon sollasi bears considerable resemblance to D. feliceps, 

 B. ictidops, and Z>. te.studicej)s. From D. feliceps it differs in 

 being a much more delicately built skull and with a very much 

 feebler tusk, the tusk in D. sollasi being about half the thickness 

 of that in D. feliceps. In B. testudiceps the postorbitals meet 

 each other in the middle line over the parietals ; in D. sollasi 

 the postorbitals do not overlap the parietals so very greatly. 

 D. ictido23s comes fiom a horizon which is probably 500 feet lower 

 than that which yields D. sollasi; so that there is a strong 

 presumption in favour of the two being distinct species, though 

 they are undoubtedly closely allied. The prepai'ietal in D. sollasi 

 is smaller than in D. ictidops, and the general contouis of the 

 bosses differ considerably in the two species. 



Dicynodon andrewsi, sp. n. (Text-fig. 30.) 



This species is founded on a nearly perfect skull from the same 

 horizon and nearly the same spot at Biesjespoort that yielded the 

 type of D. sollasi. In addition to the type specimen I have two 

 others which I refer to the same species — one from a locality 

 between Murraysburg and Biesjespoort, and the other from a 

 locality 3 miles east of Biesjespoort. As this latter specimen was 

 found in near association Avith a specimen of Cistecej^halus sp., it 

 oives us the horizon as the base of the Gistecephalus zone. 



The species is a very strikingly new type, which may ultimately 

 liave to be placed in a neAv subgenus. 



In general shape the species resembles typical Dicynodons. 

 The snout is unusually short, the preorbital region being only 

 about one-fifth the length of the skidl. Above and behind each 

 nostril is a well-marked bony boss, with a fairly broad flat sulcus 

 between. Each of the two specimens which has the maxillte 

 preserved is tuskless. 



The orbits are large, with supraorbital thickening on the 

 frontal bones. The frontal region is slightly concave behind, and 

 in front a low median elevation leaA^es each frontal bone slightly 

 concave. 



The parietal region is broad, and unlike the typical species of 

 Dicynodon, the parietals are not overlapped by the postorbitals. 

 The large size of the parietals makes a distinct approach to the 

 broad-headed Dicynodonts of the type of Dicynodon tigriceps 

 Owen, and for Avhich I am proposing a neAV genus. In fact, 

 D. andrewsi may be the ancestor of D. tigriceps. 



