438 THE OCEAN WORLD. 
but rarely beyond the point to which the tide reaches. The genus is 
numerous in species, of which we figure Cerithium fasciatum (Fig. 243) 
and Cerithium aluco (Fig. 244). The Giant Cerithium, Cerzthium 
giganteum (Fig. 245), is the living analogue of a magnificent fossil 
species belonging to the Tertiary formation. The single known 
example of this species belongs to the Delessert Museum at Paris. 
A manuscript note by Lamarck, attached to this specimen, relates 
BY oe 
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Fig. 238.—Turritella Fig. 239.—Turri- Fig. 240.—Turritella Fig. 241.—Turri- Fig. 242.—Turri- 
replicata (Linnaeus). ella angulata sanguinea (Reeve). tella goniostoma.  tella terebellata 
(Sowerby). (Lamarck). 
that this shell was first brought to Dunkirk in 1810 by an Englishman, 
one of the crew of an English ship; he had drawn it up from the 
bottom of the sea with the sounding-lead from a bed of rocks off 
the coast of Australia. 
The fourteenth family, Pyramidellide, contains the genera Eulima, 
Stylifer, Chemnitzia, and Pyramidella. 
The fifteenth family, Vaticide, contains Veélutina, Sigaretus, 
Lamellaria, and Natica; species of this last being found in most 
seas, 
The second section of the Prosobranchiata is termed S1pHoNo- 
stomata, and is characterised by the shell being spiral and usually 
