384 



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. 



Pedicularia and Erato also belong to this 



same colour as the bark of the coral. 



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 

 (Pterocerd). 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 lentiyinosus). 



the true, but very small tentacles. 



