50 



G RAY proposed Acar as a subgenus of Barbatia Gray for the three species A. reticulata 

 Chemn., A. divaricata Sow., and A. gradata Brod. & Sow. ; he however, did not publish any 

 description of it. H. & A. Adams published a description of Acar and referred further species 

 to it, but did not designate any génotype. Lamy, who raised Acar to subgeneric rank of same 

 value as Barbatia remarked that A. donaciformis Reeve had been suggested as the génotype 

 of Acar, but this species was rightly included by him in the synonymy of A. plicata Dillwyn. 

 Cox followed WooDRiNG ') in accepting A. gradata Brod. & Sow. as the génotype. 



A detailed description of the genus is published in Cox's memoir cited above. 



I. Arca {Acar) plicata Dillwyn. 



1685. Lister, Hist. Conch., pi. CCXXXIII, fig. 67. 



1795. Arca plicata Chemnitz, Conch. -Cab., XI, p. 244, pi. CCIV, fig. 2008. 

 18 17. Arca plicata Dillwyn, Descr. Cat., I, p. 227. 

 1817. Arche Savigny, Descr. Egypte, pi. X, figs. 6, i — 5. 

 18 19. Arca irudina Lamarck, Anim. sans Vertèb., VI, p. 41. 

 1833. Arca divaricata and A. picsilla Sowerby, Proc. Zool. Soc. London, p. 18. 

 1835. Arca irudina Deshayes in Lamarck, Anim. sans Vertèb., VI, p. 469. 

 1844. Arca donaciformis and A. divaricata Reeve, Conch. Icon., II, Arca, pi. XVI, figs. 104, 

 108, 112. 



1844. Arca donaciformis Reeve, Proc. Zool. Soc. London, p. 125. 



1845. Arca divaricata, A. donaciformis, A. irudina and A. reticulata Catlovv & Reeve, Conch. 



Nomencl., pp. 49 — 51. 



1847. Arca clathrata, A. divaricata, A. donaciformis, A. irudina, A. plicata, A. {Barbatia) pusilla 



and A. reticulata Nyst, Mém. Acad. Roy. Belgique, XXII, pp. 18, 26, 38, 56, 58, 60. 



1848. Arca squamosa and A. rosea Krauss, Sudafr. MolL, p. 16. 



1856. Arca plicata Hanley in Wood, Ind. Test., p. 54, pi. IX, fig. 6. 



1857. Arca [Acar] divaricata and A. [A.) donaciformis Adams, H. & A., Gen. Rec. MoU., II, p. 535. 

 1860. Arca divaricata and A. Donaciformis Reeve, Elem. Conch., II, p. 93. 



1862. Arca donaciformis Chenu, Man. Conchyliol., II, p. 173, fig. 863. 

 1865. Arca (Acar) laminata Angas, Proc. Zool. Soc. London, pp. 655, 697. 



1870. Arca {Acar) plicata Mac Andrew, Ann. Mag. Nat. Hist., (4) VI, p. 449. 



1871. Arca divaricata Fischer, P., Journ. Conchyliol., XIX, p. 214. 



1871. Arca divaricata von Martens & Langkavel, Donum Bismarck., pp. 65, 67. 



1871. Arca domingensis (non Lamarck, ex parte) Lischke, Japan. Meeresconch., II, p. 142. 



1874. Arca domingensis Lischke, Japan. Meeresconch., III, p. 107. 



1878. Arca MacCoyi Tenison-Woods, Proc. Roy. Soc. Victoria, XIV, p. 61. 



1880. Arca plicata Dohrn, Jahrb. Deutsch. Malakozool. Ges., VII, p. 175. 



1880. Arca {Acar) divaricata and A. {A.) donaciformis Von Martens, Môbius Beitràg. Meeresf. 



Mauritius Seychell., p. 320. 



1881. Acar gradata de Rochebrune (non Broderip & Sowerby), Nouv. Arch. Mus. d'Hist. Nat. 



Paris, (2) III, p. 249. 



1882. Arca Domingensis (non Lamarck), Dunker, Ind. Moll. Mar. Japon., p. 233. 



1884. Arca {Acar) Donaciformis Tryon, .Struct. Syst. Conch. III, p. 254, pi. CXXVI, fig. 41. 



1886. Arca {Acar) plicata Cooke, Ann. Mag. Nat. Hist., (5) XVIII, p. 94. 



1888. Arca divaricata Jousseaume, Mém. Soc. Zool. PVance, I, p. 214. 



1890. Barbatia {Acar) divaricata, B. {A.) donaciformis, B. {A.) laminata, B. {A.) pusilla and 



B. {A.) reticulata Paetel, Cat. Conch. Samm., III, pp. 213, 214. 

 1890. Barbatia {Acar) divaricata Kobelt in Martini Chemn. Conch. Cab. (N. F.) VIII (2), Arca, 



p. III, pi. XXIX, figs. 6 — 9. 



l) WooDRiNG, W. P. — Miocène Molluscs from Bowden, Jamaica. Pelecypods and Scaphopods, Carnegie Inst. Washington, 

 NO 366, pp. 36, 37 (1925). 



