200 NATURAL HISTORY. [NORTH 
the museum of Mr. Bullock) of a pretty large specimen 
of the Ichthyosaurus communis ; —a full length specimen 
of the same (in a separate glass Case): the restored parts 
distinguished by a colour different from that of the genuine 
portion of the skeleton ;—part of the head of another of 
still larger dimensions, cut transversely to show the internal 
structure of the jaws;—the carpal bones of one of the ex¬ 
tremities of a most gigantic species ( Ichthyosaurus im - 
mams ) : all from the lias of Lyme Regis;—a new small 
species ( Ichthyosaurus latifrons ), in which the spiracle 
on the top of the head, between the eyes, claims particular 
attention : this specimen was found at Balderton in the 
county of Nottingham, twelve feet under the surface, about 
three miles and a half south of Newark-upon-Trent, near 
the drain dividing the counties of Lincoln and Notting¬ 
ham : presented by Dr. Bland.—From nearly the same 
locality is the specimen here deposited of a species of ple- 
siosaure, an account and figure of which have been given 
in the Philosophical Transactions for 1719, by Mr. Stukeley,' 
who took it for a crocodile. A very perfect specimen, 
with head exhibiting the teeth, of the long-necked plesio- 
saure ( Plesiosaurus dolichodeirus of Conybeare) from 
Lyme Regis; and another, apparently specifically distinct, 
(as likewise a cast of the same, w T ith restorations) from 
Street in Somersetshire. 
As illustrative of the natural order of Chelonian Rep¬ 
tiles, we have some interesting specimens, chiefly from the 
isle of Sheppey, and the coast of Essex. 
The only fossil species of the Batrachian Reptiles in 
this collection is the gigantic Salamander, the subject of 
Scheuchzer’s dissertation. Homo diluvii testis et theoscopos . 
Tiguri , 1726. 
In the central passage between the Table Cases of these 
Rooms are placed various objects illustrative of particular 
mineral substances. One of the most interesting is a Table, 
presented by H. G. the Duke of Rutland, the slab of which 
is composed of a stalagmitical calcareous deposition which 
was found investing the interior of a square wooden pipe 
in Blithe Lead Mine, Derbyshire. 
The sculptured tortoise near the centre of the Gallery, 
