180 
NORTH GALLERY. 
[UPPER 
from the Coal-measures. Insect remains in amber from Stettin, on 
the Baltic, are also here displayed. 
Fossil insects may be seen in some of the specimens of amber in 
the Table Case No." 60, Room I. 
Crustacea, — Crabs and Lobsters. Cases 7 and 9, Room VI., 
contain the exhibited portion of this class. The first half of Case 9 
contains the Cirripedia, represented at the present day by the iShip 
Barnacle and the Acorn-shell. The second, contains the Bivalved 
Crustacea, Phyllopods and Ostracods ; and a portion of the Trilobites ; 
the remaining portion being in Table Case 7. In the adjoining Win- 
dow-recess Case is exhibited a series of Crustaceans belonging to 
the Eurypterida and Limulidce, or King-Crabs. The gigantic Euryp- 
teridce are extinct, but the King-Crab is found living at the present 
day. Fine examples of Limulus, from Solenhofen, and of Slimonia, 
from Lanarkshire, are placed on Case 9. 
Case 7 contains the Trilobita, the Isopoda, and the Decapoda (Crabs 
and Lobsters). Of the Trilobites, by far the greater part are from the 
Wenlock Shale and Limestone of Worcestershire and Staffordshire, and 
the Silurian rocks of Bohemia. The " Dudley Locusts " (Calymene Blu- 
menbachii) and the great " Barr Trilobite " (Illmnus Barriensis) are 
among the earliest fossils known to science. Fossil Lobsters are 
found to extend from the Coal Measures to the present day; whilst 
true Crabs first appear in the Upper Oolite. Specimens from the 
Lias of Lyme, the Oolite of Solenhofen, and the London Clay of 
Sheppey, are most deserving of attention. 
The Fossil Shells (Mollusca) are divided into four groups. 1. Lamp- 
shells (Brachiopoda). 2. Ordinary Bivalves (Conchifera). 3. Spiral 
Univalves (Gasteropoda). 4. Chambered Univalves (Cephalopoda). 
Lamp-shells (Brachiopoda). Cases 2 and 3, Room VI. Those from 
the Tertiary strata belong to existing genera, and some to existing 
species; but others, like the great Terebratula of the Suffolk crag, are 
unknown in a recent state. The Chalk species are no longer living, and 
belong chiefly to the genera Terebratula, Thecidiunl, Rhynchonella, and 
Terebratella, of which all, excepting the last, appear to be verging 
towards extinction, or are scantily represented by existing species. 
The Fossil Bivalves (Conchifera), and Spiral Univalves (Gas- 
teropoda), have been arranged in parallel groups, according to their 
geological age. 
TERTIARY FOSSIL SHELLS. (Room VI.) 
1. Newer Pliocene. The Shells of this Geological period are 
displayed in the Table Cases numbered 11 and 12, and in part of 
Case 13. 
2. Older Pliocene. In Table Case 10, will be found Shells 
of the "Crag" of the Eastern Counties, of which more than half 
are still existing, either in British Seas, in the Mediterranean, or on the 
coasts of Norway and North America. And in part of Table Case 
11 is exhibited a collection of Lithodomous Mollusca, with their 
crypts or cells: they are chiefly from the Crag of Suffolk. 
