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Page 



ITucula 377 



Tellina 76 



Tellinides 348 



Venus 110, 358 



ret icu latum, Aenigma . 313 



Ampaidesma 348 



retifera, Venus 122 



retusa, Anomia . 329 



Area 153 



retusum, Cardium 142 



retusus, i.'ytilus- , . 250 



Unio 202, 380 



phizophorae, Ostrea 297, 298 



rhombea, Area 157 



rhombeus, Unio 208, 380 



rhombifera, Venus ...... 120, 358 



rhoniboidea 201 



Cyolas . 91 



rhombula, Unio 199 



rhynoonella grayii .... 319 



rigida, Pinna 252 



Venus . Ill 



rigidura, Cardium 136 



rimularis, Venus . 125 



ringens, Capsa . 86, 349 



Cardium 130 



Crania 316 



Donax 82 



ringiculum, Cardium 136, 363 



riparia, Unio 195 



rivalis, Cyclas 89 



rivicola, Cyclas 89 



rivularis, Circe 355 



Cytherea 355 



Venus 355 



roanoakensis, Unio ........ 199 



roborata, Venus 361 



