136 
SPECIFIC 
. Specimen deep violet, beaks white; somewhat 
triangular. 
Inhabits most seas, at the bottom of which it is 
found adhering by the byssus in large clusters. It 
is generally known as the common muscle. 
> 
PLATE XI. 
Fig. 1. Vi^'SiApectinata. 
Shell transversely striate, wrinkled towards the 
base. 
Gualt. Test. Tab. 79. A. 
Specimen horn-colour with darker clouds ; about 
10 obsolete ribs converging to the smaller end; 
triangular; hyaline; brittle. A smooth variety. 
Inhabits India and Europe. 
4 
PLATE XII. 
Fig. 1. Argonauta Argo. 
Shell having the keel slightly toothed on both 
sides. 
Lister Conch. Tab. 254, 255. 
