BIVALVES. PINNA. 75 



PINNA Sea Wing. 



DIVISION I. Shells longitudinally ribbed. 



Rudis Rough. AdustaPear-shap'd. 



*Pectinata Spiny-ribb'd. Vexillum Banner. 



Inflata Inflated. Squamosa Scaly. 



*Carnea Flesh-colour' d. Vitrea Brittle. 



Rigida Rigid. Papyracea Paper. 



Nobilis Great. Saccata Satchel. J-t^ 



Muricata Prickly. Cancellata Cancellated. 



DIVISION II. Shell nearly smooth and plain. 

 Nigra Black. Bicolor Two-colour 'd. 



*Ingens Scotch. Incurva Incurved. 



Rotundata Giant. Digitiformis Finger- shap'd. 



Lobata Lobed. 



