164 



DR. R. BROOM ON 



crackled after the manner of a septarian nodule. It is practi- 

 cally impossible to make out the limits of the A 7 arious cranial 

 elements, but the general structure can readily be seen. 



The type is specially remarkable for the shortness and breadth 

 of the snout and for the small size of the teeth. 



The length from the front of the orbit to the prem axilla as 

 preserved is 21 mm., and though the internasal process is lost, 

 when allowance is made for the crushing, the original length was 

 probably not more than 22 mm. The width of the snout at the 

 plane of the front of the orbit is 28 mm. 



The premaxillaries are small, and each has four small rounded 

 incisors. 



The septomaxillary is of the typical Therocephalian and Gor- 

 gonopsian type, a rounded foramen being found between it and 

 the maxilla. 



The nasals are large and fairly broad. 



The frontals are moderately large, the interorbital measure- 

 ment being 14 - 5 mm. as preserved. Originally the measurement 

 was probably a little less. 



The maxilla is well developed and largely overlaps the pre- 

 maxilla in front. It carries two canines and probahty three molars. 



The mandible is not well preserved. The symphysis is broad 

 and probably deep. There are apparently three incisors, one 

 canine, and three molars. 



The four upper incisors measure about 8 mm. The diastema 

 between i* and c 1 is 3 mm. The two canines measure 3*5 mm., 

 the larger c 2 being only l - 8 mm. 



The lower incisors measure about 8 mm. The canine has a 

 diameter of about 1*6 mm., and the three lower molars measure 

 4 - 5 mm. From i 3 to the back of m 3 is 9 mm. 



If the above determinations are correct the dental formula 



would be i r , c ?, m ^. 



The nearest affinities of Simorhinella are probably with Icti- 

 dognathus and JScaloposaurus, and with the next described form 

 1 otocephalus. 



The type is a young animal in which there is clear evidence of 

 dental succession. 



The specimen is registered No. 49422. 



Icticephalus polycynodon, gen. et sp. n. (Text-fig. 2„) 



This new genus and species is represented by one specimen in 

 the British Museum, and one in the South African Museum, 

 Capetown. The British Museum specimen is a fairly complete 

 but very badly weathered skull : the Capetown specimen is the 

 front half of the skull, also much weathered, but showing most 

 of the maxillary teeth in fairly good condition. While I do not 

 consider that there is the least doubt but that the two specimens 

 belong to the same species, as the Capetown specimen has the 



