344 ^R- ^- BROOM ON SOME NEW 



the front of the snout was pi'obn.bly about 75 nnu. _ The inter- 

 orbital mea,8urenient is 22 mm., and the antero posterior measure- 

 ment of the orbit is 32 mm. 



The premaxillte and septomaxilla- are lost. The nasals are long 

 and narrow, only slightly wider in front and behind than in 

 the middle region. The maxilla is unusually long in comparison 

 with its depth. It passes forwards a, considerable distance in 

 advance of the canine and backwards much beyond the last molar. 

 In front of the main canine there are two small caiiines as 

 in Scaloposaurus, but the present type, besides diflfering very 

 greatly in many other ways, differs in having the third tooth 

 developed into a powerful canine. The canine here measui'e? 

 about 15 mm. in height and 5 mm. in antei'O-posterior length.^ It 

 is usually curved, and is remarkable for having no serrations 

 along its"^ posterior border. I'he thi'ee canines together measure 

 9-5 mm. Behind the main canine is a diastema of 6-5 mm. 

 followed by a series of 9 small cone-like molars, the whole molar 

 series measuring 25 mm. In Ictidosuchus 'privuevus there are ap- 

 pai^ently only 8 molars, but as both the upper and lower jaws are 



Text-fiaure 1.* 



Sicie view ot skull of Ictidosuchus longiceps Brooin. 



badly preserved, it is not improbable that there may also have 

 been 9 in the type species. The molars of Ictidosuchtis primcevus 

 are considerably larger and closer together, but appear to be 

 otherwise similar to those of I. longiceps. 



The prefrontal is a relatively large bone which forms the 

 anterior half of the upper orbital margin and extends down to 

 the middle of the anterior border. The lacrimal is considerably 

 less than half the size of the prefrontal, as will be seen in the 

 figure given. 



The jugal is a very long slender bone forming most of the sub- 

 orbital bar and about half of the outer temporal arch. A strong 

 but short ascending process forms the lower half of the post- 

 orbital arch, articulating with the short postorbital bar of the 

 postorbital bone. 



The f rentals are relatively small, and only form a very small 

 part of the supraorbital n:iargin. The bones are about the same 

 length as the orbit, and articulate in front with the nasals by 



* For explanation of lettering, see p. 355. 



