NON-PULMONARY GASTEROPODS. 
433 
(-^ig. 281) is of a reddish-brown externally and white within. The 
Triton anus (Fig. 28‘2) is of a whitish colour, spotted with red. 
Gerithium is a marine shell, which is found in muddy bottoms ; on 
'■* 'ips, and more frequently at the mouths of rivers, hut rarely beyond 
Q point to which the tide reaches. The genus is numerous in 
s Pecies. Such are Gerithium fasoiatum (Fig. 283) and Gerithium 
aheo (Fig. 284). 
. Giant Cerithium, Gerithium gigamteum (Fig. 285), is the liv- 
ln g analogue of a magnificent fossil species belonging to the tertiary 
2& 6. Fusus proboscidiferus (Lam."). 
Fig. 287. Fusus pagodus 
(Lesson). 
Fig. 288. Fusus coins 
(Linnaaus). 
f*0 
Inflation. The single known example of this species belongs to the 
^ Gessert Museum at Paris. A manuscript note by Lamarck, attached 
,° this specimen, relates that this shell was first brought to Dunkirk 
111 1810 by an Englishman, one of the crew of an English ship. 
