866 DK. R. BROOM ON 



There are two canines — a very small anterior and a fairly large 

 long slender posterior one. The small canine has a diameter of 

 •5 m.m, : the large canine measures 3*5 mm. by 4 mm. The two 

 are a little more than 2 mm. apart. The exact number of 

 molars is a little doubtful but appears to be 8, and they occupy 

 16 mm. in one of the specimens. The molars appear to be 

 all short, smooth, pointed teeth without serrations. 



In the lower jaw there are four incisors, a large canine, and eight 



molars. The dental formula would thus be i. ., c. v» n^- o- In 



Ictidognathus parvidens there are cei-tainly nine upper molars and 

 possibly ten, but as this species is certainly allied to /. parvidens 

 it seems better to keep both in the same genus. 



Suborder Anomodoxtia. 



*Endothiodon whaitsi, sp. n. (PI. XCIII. fig. 18.) 



This new species is only known by the skull, a few vertebrtB 

 and ribs, and a couple of limb-bones. Fortunately the skull is in 

 beautiful condition. The specimen was discovered by the Rev. J. 

 H. Whaits at Beaufort West. It is a near ally to Endothiodon 

 uniseries Owen, and has the molars in a single row, but it 

 differs from E. uniseries in a considerable number of points 

 besides in being nearly twice as large. In Endothiodon uniseries 

 the greatest length of the skull is 360 mm. : in Endothiodon 

 ivhaitsi the skull measures in length 570 mm. With the ex- 

 ception of Oudenodon miagnus it is the largest known Anomodont. 

 As I hope shortly to publish a full account of the genus Endo- 

 thiodon^ I shall hei'e merely give a preliminaiy description of this 

 interesting species. 



The skull is narrow and deep. The greatest width across the 

 squamosals is probably about 360 mm., while the interorbital 

 region is only 140 mm. and the greatest width of the palate 

 150 mm. There is a slight degree of crushing, but not such as to 

 make these measurements far wrong. The notch in the pre- 

 niaxilla for the point of the lower jaw is very deep and narrow. 

 The nostrils are large, measuring 65 mm. by 45 mm. The nasals 

 do not overhang them as in E. uniseries, the whole width of the 

 nasals being only 85 mm. The orbit is sitiiated 180 mm. behind 

 the front of the snout and measures from 60 to 65 mm. in 

 diameter. 



The parietal crest forms a huge arch over the top of the head 

 about 300 mm. in length. It is veiy narrow for its depth, and 

 is mainly formed by the postorbitals and the squamosals, the 

 parietals being relatively small. Near the union of the anterior 

 and middle third the two postorbitals are pushed apart by an 

 enoi'mous development of the preparietal. This forms a pro- 

 minent boss 90 mm. in length and 50 mm. in width, and rising 

 20 mm. above the edge of the postorbitals. In it is situated the 



* See also Addendum, p. 875. 



