-1869.] HULKE—CROCODILIAN SKULL. 167 
Discussion. 
The PresipEnt objected to the term Reptiles being applied to 
Amphibia, from which they were totally distinct. He questioned the 
safety of attributing the jaw to Baphetes, of which no lower jaw 
had been previously found. 
Mr. Eruerinex remarked that the Cephalaspis differed materially 
inits proportions from any in either the Russian or the British rocks. 
4, Norn on a Crocopitian Sxvrt from Kimmermer Bay, Dorszr. 
By J. W. Hurxr, Esq., F.R.S., F.G.8. 
[Prats IX.] 
A chosEr examination lately made by Mr. Davies, Sen., of the fos- 
sils presented to the British Museum last year by J. C. Mansel, 
Esq., has led to the identification of a large crocodilian head with 
the Saurian the lower jaw of which I described last session, and 
identified with Dakosaurus maximus of Quenstedt. Covered with 
matrix, this head had been previously put aside as Pliosaurian, 
other Pliosaurian remains having been presented to the Museum by 
the same muuificent donor; but now that its identity has been cor- 
rectly established, a short account of it seems to be a fit sequel to 
my last paper. 
The general agreement of their dimensions, and their discovery 
near together (in a reef exposed at low water in Kimmeridge Bay), 
make it highly probable that this head and the lower jaw both 
belonged to one individual. 
The considerable part of the head discovered by Mr. Mansel in- 
cludes the back of the skull, the left upper temporal arcade, and the 
entire snout. The extremity of this latter is completed by the pre- 
maxilla figured in the last number of our Journal, the sutures in 
which so exactly coincide with those in the broken end of the snout 
that there cannot be any doubt of the correctness of this restoration. 
The shape of the head is a long triangle; its sides converge from 
the occiput to the end of the snout, with a slight outcurve of the 
temporal arcade, a moderate incurve in front of the orbits, and a 
very slight inbend behind the nostril. Its base, a narrow occipital 
crest, slopes downwards and outwards from a lofty sagittal crest to 
the truncated mastoid angles. 
The skull has the characteristic narrowness of the temporal region, 
the extremely large crotaphite foramina, the lofty sagittal crest, and 
the lateral orbit which mark Geoffroy Saint-Hilaire’s subgenus 
Steneosaurus™. 
The sagittal crest, in its present mutilated state, rises two inches 
above the brain-cavity; a coarse diploé fills the interspace. The crota- 
* Geoffroy Saint-Hilaire, ‘Recherches sur organisation des Gavials,” &e. 
Mémoires du Muséum d’Histoire Naturelle, t. xii. pp. 148, 149 (Paris, 1825). 
VOL. XXVI.—PART I. N 
