170 K. liKOU^l. 



nostril is about 16 mm. From the median suture to tlie 

 anterior part of the maxilla is 30 mm. There appear to be 

 five teeth in front of the large canine. On the right side 

 five teeth are visible, but a fairly wide gap is present between 

 the first and second. On the left side three teeth are seen, 

 and wide gaps are present before and behind the third. 

 If we look at the alveolar margins, however, we find reason 

 to believe that there are only five teeth in front of the large 

 canine. All five are, I believe, incisors, though it must 

 be borne in mind that in some Therocephalians the small 

 tooth in front of the large canine is also a maxillary tooth, 

 and therefore a canine. The first incisoi's of each side are 

 fairly equal in size, lioth measuring about 9 mm. x G mm. 

 The second incisor is much smaller on the left side than on 

 the right, the latter measuring 10 mm. x 6 mm., and the 

 former 6 mm. x 5 mm. The third incisor of the right side 

 measures 10 mm. x 7 mm. The fourth incisor of the right 

 side measures 6 mm. x 5 mm. ; that of the left side 9 mm. x 

 5'5 mm. The fifth incisor measures 6*5 mm. x 5 mm. The 

 differences in the sizes of the teeth on the two sides is pro- 

 bably owing to the fact tliat in Therocephalians there is 

 apparently a continuous succession of teeth, a new one always 

 replacing an injured or Avorn one. The measurement in a 

 direct line from the front of the first incisor to the front of 

 the canine is 43 mm. on both sides. In no case' is the crown 

 of the tooth preserved. 



The maxillary bone has a very convex outer surface and 

 is very rugose, especially at the lower and anterior margins. 

 Its greatest depth is 50 mm. and the greatest length 

 probably 85 mm. The canine tooth measures 16 mm. x 

 12 mm. on both sides. Behind the canine are three small 

 molars. The first is 8 mm. behind the canine, it measures 

 5 mm. X 3-5 mm. The other two are smaller. The three 

 together measure 15 mm. 



From the back of the nostril to the front of the orbit 

 is 74 mm. 



The anterior part of the dentary is strongly developed, 



