3 8 4 
MOLLUSCS. 
regards the general conformation of the animal, but has a somewhat different 
radula and shell. It contains several subgenera, the most important being Radius, 
Ultimus, and Calpurnus. Radius volva is perhaps the most remarkable of all the 
species. Many of them live parasitically upon sea-fans, the shells assuming the 
MONEY-COWRIES. 
same colour as the bark of the coral. Pedicularia and Erato also belong to this 
family, although the shell of the former appears to possess no relationship with 
its other members. 
The wing-shells, or strombs ( Strombidce ), include some very large species, 
which when young somewhat 
resemble a long-spired cone. When 
mature, however, the outer lip 
thickens and spreads out, and upon 
the edge may be developed six, 
or more, claw - like appendages 
(Pterocera). The aperture is notched 
anteriorly for the short respiratory 
siphon, and the outer lip situated 
near this siphonal notch, and also 
often posteriorly at its junction 
with the whorl above. The general 
form of the shell is shortly or 
elongately fusiform, or conical. The 
animals have a well - developed, 
ringed, contractile proboscis, with 
the mouth at the end, at the base 
of which arise two enormous eye- 
stalks, supporting on their inner side 
wing-shell ( strombus lentiginosus). the true, but very small tentacles. 
