144 GUIDE TO THE FOSSIL INVERTEBRATE ANIMALS. 
Gallery 
VIII. 
Wall-case 
2 . 
Wall-case 
3. 
W all-case 
2 . 
Wall-case 
1 . 
Wall-case 
lA. 
Gallery 
VII. 
full list of the IMollusca. Bolow it are tine specimens of the 
^liildle Eocene Oanipnailc [Cerithimn] f/i;jnntenm, while in 
Case 4 is a longitudinal section of the same fossil, showing 
the shelly pleats upon the columnella. Next come the 
Tertiary shells from Ilordeaux, from IMuddy Creek, Victoria, 
and from South Australia. I’liocene shells from Italy are 
followed by rost-ITiocene shells from raised beaches in 
Florida, Australia, and elsewhere. A “ Catalogue of the 
Australasian Tertiary Mollusca,” Ijy (1. F. Harris, was issued 
by the Trustees in 1897. On the bottom slopes of Wall- 
cases 1-3 are temporarily placed small series recently 
ac<iuired : Eocene shells from Northern Nigeria ; Eocene 
shells from Somaliland ; Miocene shells from the Azores and 
from Malta ; Post-Tertiary and Tertiary shells from the 
region of the Dardanelles ; Tertiary shells from Patagonia ; 
Post-Tertiary shells from Angola, W. Africa ; and Tertiary 
shells from Alaska. AW the preceding 
series are marine, but there is also 
a series of Post-Pliocene shells of 
estuarine character from the Pampean 
formation near Buenos Ayres. Ad- 
joining these is the collection of 
marine Miocene shells from Mary- 
land, described by Thos. Say in 1824. 
Finally, next the entrance to the 
Gallery, is a small representative set 
of Pteropod shells (see p. 125), mostly 
from the Upper Tertiary rocks of Italy. 
Some recent additions to the 
exhibited series of Mollusca are men- 
tioned in an Appendix (p. 177). 
Class CEPHALOPODA. 
A whole Gallery is occupied by fossils belonging to the 
remaining Molluscan Class, the Cephalopoda (Head-feet). 
The meaning of this name is obvious to any one considering 
such well-known living examples of these marine molluscs 
as the octopus, the cuttle-fish, the squid, and the nautilus 
(Fig. 78), in all of which the mouth is encircled by arms or 
tentacles, the altered representatives of part of the molluscan 
foot. -lust behind these are the two eyes. The hind-part of 
the body consists of a rounded or sometimes elongate sack 
containing the viscera and called the visceral hump. Part 
Fig. 77. — Miocene “ Pfcer- 
opods.” a, Hyaliea tri- 
dcntafa ; b, Vayinella 
deprcssa. 
