N,..i-'M. SYNOPSIS OF NORTH AMERICAN CARDIIDjE— BALL. 383 



1856. Gould, Proceedings of the Zoological Society of London. 

 1856. Shuttleworth, Journal de Conchyliologie, V. 



1856. C.VRPENTER, Report to the British Association. 



1857. Meek and Haydex, Proceedings of the Academy of Natural Sciences of Pliila- 



delphia, VIII. 

 1857. Carpenter, Mazatlan Catalogue. 

 1857. H. AND A. Adams, Genera Recent Mollusca, II. 

 IS5S. Deshayes, Animaux sans Vertebres, bassin de Paris. 



1860. Meek and Hayden, Proceedings of the Academy of Natural Sciences of IMiila- 



delphia, IV. 



1861. Dunker, Malacozoologischer Bliltter, VIII. 



1861. Ravenel, Proceedingsof the Academy of Natural Sciences, Philadelphia, for 1861. 



1862. Conrad, Proceedings of the Academy of Natural Sciences, Philadelphia,for 1862. 



1862. Stimpson, Proceedings of the Academy of Natural Sciences,Philadelphia,forl862. 



1 863. Stimpson, Proceedings of the Academy of Natural Sciences, Phi ladelphia,for 1863. 



1864. Krebs, Catalogue of West India Shells. 



1864. Carpenter, Supplementary Report to the British Association for 1863. 



1868. Gabb, Paleontology of C-alifornia, II. 



1869. RoEMER, Conchylien Cabinet, Neue Ausgabe, Cardium. 



1870. Conrad, American Journal of Conchology, VI. 



1872. Tryon, Catalogue Cardiacea, American Journal of Conchology, VII. 



1873. Gabb, Geology of Santo Domingo. 



1875. Conrad, Appendix to Kerr, Geological Report, North Carolina. 



1875. GuppY, Annals and Magazine of Natural History, 4th series, XV. 



1876. Vest, Jahrbuch der Malakozo()logische Gesellschaft, II. 



1876. Vo^ Martens, Zoological Record, Mollusca. 



1877. GuppY, Proceedings of the Scientific Association of Trinidad. 



1878. WiiiTEAVEs, Canadian Naturalist, new series, VIII. 



1879. Bayle, Journal de Conchyliologie, XXVII. 



1880. White, Proceedings of the U. S. National Museum, II. 

 1880. Vasseur, Journal de Conchyliologie, XXVIII. 



1884. Monterosato, Nomenclatura Conchiglie Mediterranee. 



1885. Whitfield, Brach. and Lamellibr. of the Raritan Clays of New Jersey. 



1886. DoLLFus AND Dai'tzenberg, Feuille des Jeunes Naturalistes. 



1886. Dall, Bulletin of the Museum Comparative Zoology, XII, no. 6. 



1887. CossMANN, Catalogue Illustre des fos. de I'eocene des environs de Paris. 

 1887. Fischer, Manuel de Conchyliologie. 



1889. Dall, Proceedings of the U. S. National Museum, XII, No. 773. 



SYNOPSIS OF THE FAMILY CARDIIDyE. 

 GenLis CARDIUM (Linnaeus) Lamarck. 



(Syn. Cardivm Linnanis, 1758, part; -\- Cei'astes and Cerastoderma 

 Poll, 1795; -\-Acar(th<)C(ii'di(i Gray, 1851; -{-Acrmf/ioct/rd/'iwi Roemer, 

 18(50; -j-Bucardiw/tF'ischQY, 1887; -{- Cpioca7'dhu)/Coi\YSid,lS70\ -\- Car- 

 dea [Conrad, MS.] Whittield, 1885; -\-Plagiocardkcm Cossmann, 1887; 

 -\-Paj)dh'('a/'dh/h/. Sacco, 1899.) 



Subgenus Cardium s. .s. Type Cdrdium acideatum Linnanis. 



Subgenus Trachycardium Morc'h. (S3'n. Traehycardiuni'Morch, 1853; 

 -{- (r/'anocardmm Gabh^ 1808.) Typo, Cardium isocardi a Linnanis. 



Section Acrofticrupna Dall, 1900. Shell with an elevated mesial 



rib internalh% radiatiiiiif from the umbonal cavity. Type, Cardium 



^«/^^ Heilprin; Pliocene of Florida. 



