CHARACTERES GENERU M. 
5 
M Y T I L U S. 
TESTA bivalvis, faepius affixa byffio, 
* 
Cardo edentulus, diftindus, linea Tubulata excavata longitu¬ 
dinali. 
A N O M I A. 
TESTA bivalvis, inaequivalvis: valvula altera bafi perforata. 
Cardo edentulus cicatricula lineari introrfum prominente; val¬ 
vulae autem planioris in ipfo margine, 
Radii duo offici pro bafi animalis. 
OSTREA. 
TESTA bivalvis, insequi valvis, fubaurita. 
Cardo edentulus foffula cava ovata, ffiriifque lateralibus tranf- 
verfis. 
Vulva Axusve nulla, 
Fig. 83. 88. 107. 
A R C A, 
TESTA bivalvis, sequi valvis. 
Cardo dentibus numerofis, acutis, alternis, infertis, 
Fig. 97. 101, 106. 
C 
C H A M A. 
