THE HEAD OF A NEW FOSSIL ANIMAL. 477 



surface of the dental bone for the accommodation of the 

 inferior maxillary nerve; teeth very obtusely Unciform. 



Species 2. S. Leamts. Teeth acutely Unciform, much 

 smaller than in the preceding species, slightly curved. 



Saurodon Leanus. — Plate XVI. 



Fig i — Fragment of head, lateral view. a. Dental bone. b. Intermaxillary 

 bone. c. Upper maxillary bone. g. Lachrymal bone. 



Pig. 2. — Head seen from above, b. b. Intermaxillary bones, e. Teeth of tindei 

 i f.f. Nasal grooves, g. g. Lachrymal bones, ft. Small groove. /'. An ar- 



ticulating surface, q. An articulating surface of upper maxillary I 



I jr. 3. — Posterior view. d. d. Glenoid cavities in coronoid bom 



1 i. — Anterior view. o. Foramina in dental bone for transmission of nerve.- 

 and blood-vessels to the teeth. 



F " — Portion of upper jaw, with the outer lamma oi bone removed to 

 show the mode of dentition, magnified three times. /. /. New teeth, m.m. Old 

 teeth. /). Empty alveolus. 



Fig. 6, — Portion removed from posterior part of upper jaw, right side — 

 nal aspect, magnified three limes, o. Foramina for transmission of m 

 blood vessels to teeth. i> Empty alveolus. 



I : Tooth, removed from alveolus />. Kilt- ,; . inm 



Fig. ■ . — Same tooth, external aspect. 



I Ditto side view 



I 10 Ditto section of the root. 



Fi| il — Saurodon lanciformis. Portion of dental boi 

 removed so as to show the alveoli and form of the tcetli. magnified thi 



Reci'i December i. L829j and January i 1330. 



