510 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Systematic catalogue of the moU/usks of l'orto Rico — Continued. 
Subfamily Arcinal 
Genus Arca Linnaeus. 
Subgenus Arca Linnaeus. 
Area occidentalis Philippi. 
Area umbonala Lamarck. 
Subgenus Barbatia (Gray) Adams. 
Area harbaia Linnaeus. 
Area Candida Gmelin. 
Area reticulata Gmelin. 
Arca adamsi (Shuttleworth) Smith. 
Subgenus Scapiiarca (Gray) Dali. 
Area campechensis Gmelin. 
Arca deshayesii Hanley. 
Area secticostata Reeve. 
Arca chemnitzi Philippi. 
Su per family Pte ri ace a . 
Genus Pinna Lamarck. 
Pinna carnea Gmelin. 
Genus Atrina Gray. 
Atrina rigida Dillwyn. 
Family Meljnidal 
Genus Melina Retzius. 
Mel ina alata Gmelin. 
Melina listeri Hanley. 
Melina semiaurita Linnaeus. 
Family Pteiuida:. 
Genus Pteria Scopoli. 
Pteria radiata Leach. 
Superfam ily Ostreida:. 
Family Ostreidal 
Genus Ostrea Linnaeus. 
Ostrea virginica Gmelin. 
Ostrea cristata Born. 
Ostrea frons Lin naeus. 
Family Pectinidal 
Genus Pecten Muller. 
Subgenus Pecten s. s. 
Pecten laurenti Gmelin. 
Pecten ziczac Linnaeus. 
Pecten viedius Lamarck. 
Subgenus Chlamys Bolten. 
Pecten mayaguezehsis Dali & Simpson 
Pecten gibbus Linnaeus. 
Pecten nodosus Linnaeus. 
Pecten ornatus Lamarck. 
Pecten lemniscatus Reeve. 
Pecten exdsperatus Sowerby. 
Pecten antillarum Recluz. 
Subgenus Amusium Bolten. 
Pecten nanus Verrill & Smith. 
Pecten pourtalesianus Dali . 
Family Spondylida:. 
Genus Spondylus Linnaeus. 
Spondylus echinatus Martyn. 
Genus Plicatula Lamarck. 
Plicatxda gibbosa Lamarck. 
Family Libiida;. 
Genus Lima (Bruguiere) Cuvier. 
Lima scabra Born. 
Lima scabra var. tenera Sowerby. 
Lima lima Linnaeus. 
Lima inflata Lamarck. 
Lima hums Gmelin. 
Genus Limatula S. Wood. 
Limatida subauriculata Montagu. 
Superfamily Anomiacea. 
Family Anomiidal 
Genus Anomia (Linnaeus) Muller. 
Anomia simplex d’Orbigny. 
Genus Pododesmus Philippi. 
Pododesmm rudis Broderip. 
Superfam ily M ytilacea . 
Family Mytilida:. 
Genus Mytilus Bolten. 
Mytilus hamatus Say. 
Mytilus exustus Linnaeus. 
Genus Modiolus Lamarck. 
Modiolus tulipus Lamarck. 
Modiolus arborescens Dillwyn. 
Modiolus cinnamomeus Lamarck. 
Modiolus coralliophagus Gmelin. 
