500 
English teeth of the Stutgard species have yet been submitted to 
the microscope, Mr. Owen strongly suspects that the cast of a large 
jaw containing several teeth, from Guy’s Cliff, near Warwick, the 
original of which has been mislaid in the Oxford Museum, is iden- 
tical with the Labyrinthodon Salamandroides of Stutgard; thus 
almost demonstrating the evidence required by Mr. Murchison and 
Mr. Strickland * to show the identity of the Warwick and Guy’s 
Cliff sandstones with the keuper of Germany. Mr. Owen con- 
cludes, that if on the one-hand geology has derived essential aid 
from minute anatomy, in no instance has the comparative anatomist 
been more indebted to geology than for the fossils which have re- 
vealed the most singular and complicated modification of dental 
structure hitherto known, and cf which no conception could have 
been gained from an investigation of the teeth of living animals. 
Professor Owen has communicated to us a Report on two new 
fossil reptiles, recently acquired by Sir P. Egerton from the chalk 
of Kent: one cf them a tortoise, allied to the Chelonians which 
now live in fresh water, or in estuaries; the other a small Saurian, 
which has teeth generically distinct from any known Lacertians, 
and resembling the points of stout packing-needles; to this new 
lizard in the chalk he has given the name Raphiosaurus. ( 
Mr. Mackeson has discovered in the bottom of the lower green- 
sand formation near Hythe a very large tibia and several other 
bones which he refers to the Iguanodon, spread in the quarry over 
a length of fifteen feet; in the same quarry were a large Ammo- 
nite, a Gervillia, and other marine shells characteristic of the lower 
greensand. We have in these bones another case similar to that of 
the nearly entire skeleton of Iguanodon found in the greensand near 
Maidstone, and transferred with Mr. Mantell’s collection to thie 
British Museum; showing the duration of the Iguanodon to havé 
extended beyond the period of the Wealden freshwater formation 
into that of the greensand. In both these cases the carcases must 
have been drifted into salt water from some not far distant land, 
the site of which we cannot conjecture to have been nearer than 
Devonshire, Normandy, or the Ardennes. ; , 
ICHTHYOLITES: 
Respecting the bone-bed in the Severn near Aust Passage, and at 
Axmouth Cliff near Lyme, Regis, which has hitherto been referred 
to the bottom of the lias formation, Sir P. Egerton,and M. Agassiz 
have found ichthyological reasons for considering it to be connected 
with the Triassic or new red sandstone group ;: because they find in it 
the teeth of four species of fishes hitherto discovered only in the mus- 
chelkalk or grés bigarré, and never in the lias, viz. Gyrolepis A/- 
berti, G. tenuistriatus, Saurichthys apicalis, and Hybodus plicatilis. 
It remains to examine the bones of the larger animals in this stratum 
to ascertain how far they agree with the Saurians of the Triassic 
system or of the Lias.. The teeth of Ceratodus, figured by Agassiz, 
* Geol. Trans., N.S., vol.'v. p. 345. 
