PROF. SEELEY ON THE MAXILLARY BONE OF A NEW DINOSAUR. 439 



28. On the Maxillary .Bone of a new Dinosaur (Peiolontogna- 

 thus Phillipsii), contained in the Woodwardian Museum of 

 the University of Cambridge. By Harry Govier Seeley, Esq., 

 E.L.S., P.G.S., Professor of Physical Geography in Bedford 

 College, London. (Read March 24, 1875.) 



[Plate XX.] 



Among the few Eeptilian fossils collected by the late Dr. Porbes- 

 Young, and presented to the Woodwardian Museum of the Univer- 

 sity of Cambridge by Sir Charles Young and Henry Young, Esq., 

 was a not very promising specimen showing tooth-sockets, imbedded 

 in a yellow sandstone, containing a variety of Pecten vagans. It 

 was in association with bones from the Wealden of Tilgate Porest, 

 but may be of Great Oolite age ; though I have collected a similar 

 Pecten from a purple clay low down in the Wealden series at Lul- 

 worth. In 1869 the matrix of this fossil was removed, so as to 

 expose the external aspect of the jaw; and as in those days I 

 saw no reason for thinking it other than an Iguanodont maxillary 

 bone, the species was briefly described in the * Index to the Aves, 

 Onithosauria and Keptilia in the Woodwardian Museum ' (pp. xix. 

 and 82) as Iguanodon Phillipsii. Mentioning to the Woodwardian 

 Professor (Prof. Hughes) my desire to describe this and the other 

 species which are briefly indicated in my published catalogues pre- 

 pared for the late Prof. Sedgwick, Prof. Hughes met me with great 

 cordiality, and afforded every assistance in examining the specimens. 

 I offer my thanks to Prof. Hughes for this courtesy, which en- 

 ables me to give effect to a request reiterated by Prof. Sedgwick 

 during the last years of his life. 



After cleaning the fossil a little, I found several successional teeth, 

 which closely resembled the teeth of Scelidosaurus* and the teeth 

 attributed by Prof. Huxley to Acanihojpholis ; so that I have had no 

 doubt of its claim to rank as a distinct genus under the name of 

 Priodontognatlms, and in nearer association with Hylceosaurus than 

 with any Wealden type. The specimen is 4| inches long, is com- 

 pressed from side to side, and — since the palatal part of the bone, 

 if it ever existed, is broken away aud missing — consists principally of 

 the external and alveolar portion, showing anteriorly its surface for 

 vertical squamous sutural union with the premaxillary bone (PL XX. 

 figs. 1-4, a), a narrow posterior spur for connexion with the malar 

 bone (b), and an ascending nasal process in the middle of the upper 

 margin (c), which divided the orbit from the narine. The alveolar 

 part of the bone is 4| inches long, an inch deep in front from the nasal 

 to the alveolar margin, and rather narrower behind from the orbital 

 region to the alveolar border. The bone terminates posteriorly in a 

 narrow triangular claw-like process (6), which is prolonged outward 



