ME. T. ATTHEY ON ANTHEAC0SAUETTS ETJSSELLI. 323 



distance from the second are the third and fourth, which are in 

 contact with each other ; half an inch behind them are the fifth 

 and sixth, also close together; and these are distant from the 

 seventh seven-tenths of an inch ; from this to the eighth is two- 

 tenths of an inch ; and there is the same distance between the 

 eighth and the two next (the ninth and tenth), which are also 

 close together ; these are two-tenths of an inch apart from the 

 eleventh ; the twelfth and thirteenth, likewise in contact, are at 

 the same distance behind the eleventh ; at two-tenths of an inch 

 further back are the fourteenth, fifteenth, and sixteenth, at short 

 distances from each other ; and at an interval of three-tenths of 

 an inch from the sixteenth are seen the seventeenth, eighteenth, 

 and nineteenth, which are in contact and somewhat smaller than 

 the others ; these are placed near the posterior end of the dentary 

 bone, terminating the series. 



The outer surface of the left ramus of the mandible is given in 

 Plate VIII. fig. 2. This ramus bears fifteen teeth, nearly all of 

 which have been worked out on their inner surface and are there- 

 fore not represented in the figure, their outer surface being co- 

 vered by the matrix as far as the margin of the alveolar border : 

 portions of six teeth are seen near to the symphysial end on this 

 side, and are irregularly placed. On the inner surface the teeth 

 are more uniformly disposed, and stand out nearly half an inch 

 above the alveolar border, which is very strong and slightly con- 

 cave from end to end of the ramus. The dentary piece is united 

 below to the angular, which forms the inferior convex border of 

 the ramus from the symphysis to its articulation behind with 

 the articular piece. This, from its union with the angular, 

 curves gently upwards, forming the posterior border of the 

 ramus, and is surmounted by the articular cavity ; it sends out 

 backwards no postarticular process. 



The coronoid process or rising is broad and elongated, project- 

 ing above the level both of the articular cavity and the dentary 

 bone ; a deep channel or mucus-groove runs along the inferior 

 margin of the ramus from the anterior to the posterior end of 

 the angular piece ; it then curves upwards and forwards for a 



v 



