52 Geological Society: Sir P. Egerton 



the Caen oolite. A tenth has heen described by Professor Owen in 

 his ' Odontography' from specimens in the Hunterian collection, and 

 Professor Agassiz has named an eleventh in the museum of Lord 

 Enniskillen, from the gault. Sir P. Egerton, in the present memoir, 

 doubles the number. With one exception he founds his characters 

 on the lower jaws of the animals, avoiding the risk of ascribing spe- 

 cific differences to teeth derived from one and the same species, 

 varying in form according to their position in the mouth. 

 The characters of the new species are as follows : — ■ 



1. C. neglecta. — Maxillary plate, left lower jaw : length 6 lines ; 

 depth at the symphysis 2 lines ; ditto at the medial angle of the 

 dental edge 3 lines ; length of the dental edge 3^ lines ; anterior 

 division of ditto 1| line ; posterior ditto ditto l£ line ; length of the 

 heel 2^ lines ; exterior convex ; exposed surface slightly furrowed ; 

 base expanded and vertically striated ; two depressions, the anterior 

 one broad, the posterior narrow and deep. Stratum, great oolite : 

 locality, Stonesfield. 



2. C. Bucklandi. — Maxillary plate, right lower jaw (imperfect): 

 length 2 inches 1 line ; depth at the symphysis 1 inch 2 lines ; ditto 

 at the medial angle of the dental edge 9 lines; length of the dental 

 edge 1 inch 6 lines ; anterior division of ditto i inch ; posterior ditto 

 mutilated ; exterior smooth and flat ; inner surface rounded, dimi- 

 nishing in diameter towards the base ; symphysis oblique and 

 rounded ; texture dense. Stratum, great oolite : locality, Stonesfield. 



3. C. psittacina. — Maxillary plate, right lower jaw: length 8 

 lines ; depth at the symphysis 4 lines ; ditto at the medial angle of 

 the dental edge 4 lines ; length of dental edge 4 lines ; anterior 

 division of ditto 1| line; posterior ditto 1\ lines ; heel 3^ lines ; 

 exterior flat, marked by horizontal undulating bands on the base, 

 with a few vertical striae near the heel ; two depressions, broad and 

 shallow ; anterior outline abruptly curved upwards to the point. 

 Stratum, great oolite : locality, Stonesfield. 



4. C. curvidens. — Maxillary plate, right lower jaw : length 1 inch; 

 depth at the symphysis 4 lines ; ditto at the medial angle of the 

 dental edge 5 lines ; dental edge 7 lines ; anterior division of ditto 

 3 lines ; posterior ditto ditto 4 lines ; heel 3 lines ; exterior convex, 

 curving rapidly inwards to the symphysis ; exposed portion invested 

 with a thick lustrous enamelloid coating, 3 lines in depth at the 

 symphysis; base expanded and closely striated ; one elongated depres- 

 sion near the heel ; anterior division of the dental edge concave, 

 posterior ditto straight. Stratum, great oolite : locality, Stonesfield. 



5. C.falcata. — Maxillary plate, left lower jaw: length 1 inch; 

 depth at the symphysis 3^ lines ; ditto at the medial parts of the 

 dental edge 4 lines ; heel 4 lines ; dental edge 6 lines ; tooth elon- 

 gated, falcate, the point curved upwards ; base shallow anteriorly, 

 expanded and traversed by a broad depression near the heel ; ver- 

 tical striae indistinct ; horizontal bands broad and undulate ; cutting 

 edge concave, forming a single curve without any medial angle from 

 the point to the heel. Stratum, great oolite : locality, Stonesfield. 



G. C. emaryinata. — Maxillary plate, left lower jaw: length 2 inches 

 5 lines ; depth at the symphysis I inch 8 lines ; ditto at the medial 



