15 



480. Neaera fibrosa, {Evans cj- Shumard) Meek. 

 4sl. Neaera moreauensis, Meek .j- llayden. 



482. Neaera ventricosa, Meek i^- ILiyden. 



483. Thracia gracilis, ^flek Sj- llaijelen. 



484. Thracia occidentalis, Meeh. 



485. Thracia? Prouti, Meek ^ Hayden. 

 48(3. Thracia subtortuosa, Meek j^ llayden. 



487. Thracia subtruncata. Meek. 



488. Periploma applicata, Conr. 



489. Anatina elliptica, Gahli. 



490. Anatina sulcatina, Shumard. 



CorlJiilidae. 



491. Corbula crassimarginata, Meek <J- llayden. 



492. Corbula crassiplicata, Gabb. 

 403. Corbula eufalensis, Conr. 

 4!»4. Corbula Foulkei, Lea. 



405. Corbula graysonensis, Shumard. 



40(J. Corbula Hillgardii, Gabb. 



497. Corbula inornata, Meek <^ llayden. 



498. Corbula occidentalis, Co>tr. 



499. Corbula [?] subcompressa, Gabb. 



500. Corbula Tuomeyi, Shianard. 



501. Corbulamella gregaria, J/eeA: *$• llayden. 



Saxicavidae. 



502. Panopaea decisa, (Conr.) Gabb. 



503. Panopaea Newberryi, Shumard. 



504. Panopaea occidentalis, il/ee/L- <f' Hayden. 



505. Panopaea subplicata, Shumard. 



506. Panopaea subparallela, ShH7nard. 

 5n7. Panopaea texana, Shumard. 



50S. Panopaea Tuomeyi, t(^«6/^. 



509. ? Pachymya austenensis, Shumard. 



Soleuidae. 



510. Siliquaria biplicata, Conr. 



511. Siliqua cretacea, Gabb. 



512. Pharella dakotensis, Meek ^- llayden. 



513. Legumen appressa, Conr. 



514. Legumen elliptica, Conr. 



515. Legumen planata, (ra6&. 



Oastrochaeuidae. 



516. Clavagella armata, Morton. 



517. Gastrochaena americana, Gabb. 



