CONTENTS. XXI 





Page 



Lepton 



270 



Cyarniuui 



271 



Montacuta - 



271 



Family XII. — Galeommacea - 



- 272 



Galeomma - 



- 272 



Family XIII. Astartuceu - 



- 273 



Arastte - 



- 273 



Pronoe - 



- 274 



Crassatella 



- 274 



Cardinia - 



- 274 



Megalodon - 



- 275 



Family XIV. Ccirditaceu - 



- 275 



Cardita - " 



- 276 



Trapezium - 



- 276 



Opis - 



- 277 



Myoconcha - 



- 277 



Family XV. — Solenomyacea - 



- 277 



Solenomya - 



- 278 



Family XVI. Arcacea - 



- 278 



Area - 



- 278 



(InfMillrp?! - — — _ 



279 



Scaphula ~ 



- 2S0 



Orthonota - 



- 280 



Pectunculus - 



- 280 



Limopsis - 



- 281 



Family XVII. JVuculciceci - 



- 281 



Nucula - 



- 281 



Niipnlinfi ■ - - - 



282 



Leda - - - 



- 282 



Yoldia - 



- 283 



Malletia - 



- 2S3 



Lyrodesma ... - 



- 284 



Family XVIII. — Trigoniacea 



- 284 



Lyrodon ' - 



- 284 



Schizodus - 



- 285 



Family XIX. — Unionacea - 



- 285 



Unio - - - - - 



- 287 



Paxyodon - 



- 288 



