144 GUIDE TO THE FOSSIL INVEETEBEATE ANIMALS. 



Gallery Middle Eocene Cam'paniU [Ce^^ithmni] giganteum, while iii 

 Case 4 is a longitudinal section of the same fossil, showing 

 the shelly pleats upon the columnella. Kext come the 

 Wall-ease Tertiary shells from Bordeaux, from Muddy Creek, Victoria, 

 ^* and from South Australia. Pliocene shells from Italy are 

 followed by Post-Pliocene shells from raised beaches in 

 Florida, Australia, and elsewhere. A " Catalogue of the 

 Australasian Tertiary Mollusca," by G. F. Harris, was issued 

 by the Trustees in 1897. On the bottom slopes of Wall- 

 cases 1-3 are temporarily placed small series recently 

 Wall-case acquired : Eocene shells from N'orthern Nigeria (Annals and 

 2- Mag. Nat. Hist., 1905); Eocene shells from Somaliland 

 (Quart. Journ. GeoL Soc, London, 1905) ; Miocene shells 

 Wall-case from the Azores and from Malta ; Post-Tertiary and Tertiary 

 2' shells from the region of the Dardanelles (Quart. Journ. 

 Geol. Soc, London, 1904) ; Tertiary shells from Patagonia ; 

 Wall-case Post-Tertiary shells from Angola, W. Africa ; and Tertiary 



shells from Alaska. All 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 

 (Journ. Acad. Nat. Sci., Philadelphia). 

 Finally, next the entrance to the 

 Fig. 77.— Miocene Ptero- Gallery, is a small representative set 

 f 7i^L.t <'f Pteropod shells (see p. 125), mostly 

 depressa. from the Upper Tertiary rocks of Italy. 



Wall-case 



Class CEPHALOPODA. 



Gallery A whole Gallery is occupied by fossils belonging to the 

 VII. 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, tlie 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. Just 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 



