202 DESCRIPTION OF FISHES. 
Family Pristipz. 
Genus Pristis. 
In Tab. XII. figs. 9 & 10, are given two views of the natural size of one of 
the rostral teeth of a Saw-fish, which differs by its curvature from all the known 
species recent or fossil, and for which the name Pristis contortus is proposed. 
Family Eparnopontip2&, Owen. 
Genus Edaphodon. 
The beautiful jaws of this chimeroid fish are usually found in the substance of 
the London clay, after the surface has been well-bared by high tides and storms ; 
the specimens are seldom rolled: when met with, it is advisable to pursue the 
search, for in more than one instance the premaxillary bones (formerly called 
Passalodon) have been also discovered*. 
Suborder SQUALID, Miiller. 
Galeocerdo latidens. (Tab. XI. figs. 22, 23.) 
The genus Galeocerdo has been formed by Agassiz from the genus Galeus of 
Cuvier. See page 230, vol. i. of Agassiz’s work on Fossil Fishes. 
There can scarcely be any doubt but that the species above named is the 
same as that figured in the ‘ Poissons Fossiles,’ pl. 26. fig. 22 & 23. The an- 
terior margin is less arcuate than in most of the other species ; the cone is sharp 
and pointed, the posterior notch forms a very sharp angle, below which the 
* A paper of great value to the paleontologist published in the ‘ Quarterly Journal’ of the Geo- 
logical Society for May 1847, by Sir Philip Grey Egerton, Bart., F.R.S., V.P.G.S., &c., on the No- 
menclature of the Fossil Chimzeroid Fishes. 
Sir Philip Egerton has made a new arrangement of the dental armature of these curious fishes, and 
has clearly pointed out that the genus Passalodon must be abandoned, for the fossils constituting that 
genus are, in fact, the premaxillary apparatus of Edaphodon, and in like manner Scaphodus is the pre- 
maxillary of Hlasmodus. Discoveries of this character are most valuable, and demonstrate the ad- 
yantage of sound anatomical knowledge. The fossils of the genus Hdaphodon, found in such good 
preservation at Bracklesham, have been in some measure the means of establishing these facts. 
The genus Elasmodus, formed by Sir Philip Egerton, is remarkable for a laminated structure in 
both upper and lower jaws; this character suggested its generic name. “It has also, like Hdaphodon, 
