Mollusca. 
Gallery, 
No. 8 on 
Plan. 
West side. 
Wall-cases, 
Nos. 1, 2, 3, 
and 4. 
Table-cases, 
Nos. 100 
and 101. 
Cerithium 
giganteum. 
Wall-cases, 
Nos. 5 and 6. 
Table-case, 
No. 93. 
Wall-case, 
No. 7. 
Table-cases, 
Nos. 92 to 
98. 
Gallery, 
No. 8. 
East side. 
Table-cases, 
Nos. 85, 86, 
87, and 88. 
78 Lamellibranchiata , Brachiopoda. 
Graphical order, commencing witli the most recent deposits, 
snch as the Peat, Raised-Beaches, Glacial deposits, and going 
hack in time to the Silurian and Cambrian periods. 
Attention is drawn to the fine series ot“ Mollusca from the 
French, Italian, and English Tertiary strata, particularly to 
the beautiful collection of shells from the Eocene strata 
of the Paris Basin (Wall-cases Nos. 3 and 4), and the Miocene 
of Bordeaux (Wall-cases Nos. 1, 2, and 3), to our own 
Eocene shells from Highgate, Bracklesliam, Barton, and the 
Isle of Wight (see Table-cases Nos. 100, 101). This Molluscan 
fauna of the South-east of England indicates the former exist- 
ence of a much warmer climate in Britain than we now 
experience; for such genera as Conus and Voluta, then so 
abundant, do not now live on our coasts, but must be sought 
for in subtropical seas. _ „ 
A fine specimen of Ceritliium giganteum from the Eocene ot 
the Paris Basin is placed under a glass-case between Wall- 
cases 3 and 4. In the centre of this Gallery is placed a fine 
slab of “ Petworth Marble,” entirely composed of the shells of a 
fresh-water snail Vivipara ( Paludina ) fiuviomm, Sby. The 
elegant columns of the Temple Church, Fleet Street, are made 
of this marble from the Weald of Sussex. 
In Wall-cases Nos. 5 and 6 are placed the curious shells 
called Hippurites, allied to the existing Chamas. They probably 
lived clustered in Coral-reefs like their modern representatives. 
They are seldom met with in the Cretaceous rocks of this 
country, but the “ Hippurite limestone ” is largely developed on 
the Continent, in France, Spain, and Italy ; it also occurs in the 
East and West Indies. . 
Among the Oolitic and Cretaceous Mollusca may be noticed 
the shells°of three genera, rarely obtained living in the seas of 
to-day, namely , Pleurotomaria (Table-case No. 93 and Wall-case 
No. i)\ Pholadomya and Trigonia (Table-cases Nos. 92 to 98). 
Only four recent species of Pleurotomaria, represented bv 13 
specimens, have been obtained. As many as 1,156 species are 
recorded fossil, ranging from the Tertiaries to the Silurian 
formation, but mostly found in the Oolitic and older rocks. A 
single living species of Pholadomya is known from the West 
Indies ; whilst Trigonia only occurs in the seas of Australia. 
Division B. — Molluscoida. 
Class 5. Brachiopoda (“ Lamp-shells,” ex. Terebratula ) . 
The British collection of Braehiopods, or “Lamp-shells,” 
occupies Table-cases Nos. 85, 86, 87, and 88. The Tertiary, 
Cretaceous, Oolitic, Carboniferous, and Devonian forms being 
