Retusidae 



Retusa canaliculata (Say) 

 Pyramidellidae 



Odostomia acutidens Dall 

 Odoslomia impressa (Say) 

 Odostomia producta Dall 

 Odostomia seminuda C. B. Adams 

 Odostomia sp. 



Pijramidella crenulala (Holmes) 

 + Sayella hemphilli (Dall) 

 Turbonilla conradi Bush (Dall) 

 Turhonilla dalli Bush 



Acteocinldae 



Cylichna bidenlala (Orbigny) 

 Acteonidae 



Acleon punclostrialus (C. B. Adams) 

 Aplysildae 



Bursatella leachi plei Rang 

 Ellobildae 



Melampus coffeus (Linn^) 



CLASS AMPHINEURA 



Ischnochitonldae 



Chaetopleura apiculata (Say) 

 Ischnochiton papillosus (C. B. Adams) 



Chitonldae 



Chiton tuberculalus Linn^ — H. 



CLASS SCAPHOPODA 



Dentaliidae 



Dentatium eborcum Conrad 



Denlalium antillarum Orbigny 



Dentalium sp. (resembles D. texasianum Philippi) 



CLASS PELECYPODA 



Solemyacidae 



Solemya occidenlalis Deshayes 

 Nuculidae 



Nucula proxima Say 

 Nuculanldae 



Nuculana acuta Conrad 

 Arcidae 



Anadara transversa (Say) 

 *Arca zebra Swainson 

 Barbatia cancellaria (Lamarck) 

 Barbatia Candida (Helbling) — D. and K. 

 Noetia ponderosa (Say) 



Glycymerldidae 



Glycymeris pectinata (Gmelin) 



Pinnldae 



Atrina rigida Lightfoot 

 Mytilidae 



Amygdalum papyria (Conrad) 



Brachidontes exustus (Linn6) 



Lioberus caslaneus (Say) 



Lithophaga bisulccUa (Orbigny) 



Modiolus demissus (Dillwyn) — H. 



Modiolus demissus granosissimus (Sowcrby) — B. and 



B. 

 Modiolus americanus (Leach) 

 Musculus lateralis (Say) 



Plicatulidae 



Plicatula gibbosa Lamarck 

 Ostreidae 



Crassostrea virginica (Gmelin) 

 Oslrea equestris Say 

 Ostrea frons Linnd 



Pectinidae 



Aequipecten irradians concentricus (Say) 

 Anomiidae 



Anomia simplex Orbigny 

 Crassatellldae 



Crassinella lunulata Conrad 



Cardltidae 



Cardita floridana Conrad 

 Venericardia per plana (Conrad) 

 Venericardia tridentata (Say) 



CorbicuUdae 



Pseudocyrena floridana (Conrad)— B. and B. 



Erycinldae 



Erycina floridana Vanatta 

 Mysella planulata (Stimpson) 



Montacutldae 



Montacuta floridana Dall 



Ludnidae 



*Anodontia alba Link 

 Anodontia philippiana (Reeve) 

 Codakia orbiculata (Montagu) — B. and B. 

 Lucina multilineata (Tuomey and Holmes) 

 Phacoides nassula (Conrad) 



Dlplodontldae 



Diplodonta punctata (Say) 



Chamldae 



*Chama congregata Conrad 



Cardlidae 



Dinocardium robustum vanhyningi (Clench and L. 



C. Smith) 

 Laevicardium mortoni (Conrad) 

 Trachycardium egmontianum (Shuttleworth) 

 Trachycardium muricalum (Linn6) 



DISTRIBUTION OF MOLLUSKS IN AN ESTUARY 



305 



