28; 



1887. Cardiinn [Heviicardiuin-Opisocardiniii) heinicardiuni Fischer, P., Man. ConchylioL, p. 1039, 



pi. XIX, fig. 3. 



1890. Cardiiivi [Hemicardiuvi) lieniicardiiiin Paetel, Cat. Conch. Samm., III, p. 1T9. 



1896. Cardiiini Jieniicardiîini Casto de Elera, Cat. Sist. Filip., p. 774. 



1900. Cardiiini (Fraguin- Heinicardiuni) Iieinicardiiim Dali, Proc. U. S. Nat. Mus., XXIII, p. 384. 



1903. Heinicardinui hemicardium Hidalgo, Obras Malacol., II, p. 355. 



1904. Cardimn [Fraguin] hemicardium Smith, Ann. Mag. Nat. Hist., (7) XIV, p. 482. 



1905. Hemicardium hemicardium Hidalgo, Cat. Filip., p. 347. 



1906. Cardissa liemicardiuni Standen & Leicester, Ceylon Pearl Oyster Rept., V, p. 292. 

 1906. Cardium Jieinicardium Hedley, Proc. Linn. Soc. N. S. Wales, XXXI, p. 465. 



1910. Cardium Hemicardium Hedley, Austral. Ass. Adv. Sci., XII, p. 348. 



191 1. Cardium [Hemicardium) hemicardium Lamy, Bull. Mus. d'Hist. Nat. Paris, XVIII, p. 132. 

 1911. Cardium hemicardium Pelseneer, "Siboga" Lamellibranches (Anat.), pp. 55, 56, 57, 



pi. XXI, figs. 3, 4. 

 1928. Cardium [Hemicardium) Iiemicardium Faustino, Summary Philippine Mar. Freshw. MolL, p. 63. 

 1930. Cardium [Hemicardium) Iiemicardium Thiele, Faun. Sùdwest Austral., V, p. 593. 



Some of the "Siboga" shells of this well known species differ from Chinese, Philippine 

 and shells from other localities in the British Muséum collection in having some of the ribs 

 more reg'ularly tuberculated ; this character, however, does not seem to be of sufificient importance 

 to consider thèse shells as constituting a distinct race. 



Distribution : — C. hemicardmm is widely distributed in the Indo-Pacific. 



The "Siboga" Expédition collected shells of this species at the Anchorage off Djangkar, 

 Java (St. 4), Sailus Ketjil, Paternoster Islands (St. 37), Anchorage off Pulu Sarassa, Postillon 

 Islands (St. 43), Kambaragi Bay, Tanah Djampeah (St. 64) and Macassar (St. 71) and dredged 

 a few valves at St. 260 (5°36'.5S., i32°55^2E., 90 mètres). 



Genus Lunulicardia Gray. 



1853. Lunulicardia Gray, Ann. Mag. Nat. Hist., (2), XI, p. 41. 



1857. Lunulicardia Adams, H. & A., Gen. Rec. MolL, II, p. 459. 



1869. Lunulicardia Rômer in Martini-Chemn., Conch. Cab. (N. F.), X (2), Cardiacea, p. 116. 



1887. Opisocardium Fischer, P., Man. ConchylioL, p. 1058. 



1900. Opisocardium Dali, Trans. Wagner Free Inst. Philadelphia, III, p. 1077. 



1930. Opisocardium Stewart, Spécial Publication Acad. Nat. Sci. Philadelphia, N° 3, p. 271. 



The genus Ltmulicardia^ as its name suggests, is easily recognized by the deeply im- 

 pressed lunule which presses the hinge out of shape. The génotype is Lunulicardia retusa (Linn.). 



I. Lunulicardia retusa (Linn.). 



1767. Cardium retusmn Linnaeus, Syst. Nat., (éd. XII), p. 1121. 



1780. Cardium retusum Born, Test. Mus. Caes. Vindobon., p. 41, pi. III, figs. i, 2. 



1782. Cardium retusum Linnaei Chemnitz, Conch. -Cab., VI, p. 147, pi. XIV, figs. 139 — ^142. 



1788. Cardium retusum Schrôter, Conch. -Cab. Namen Reg., p. 19. 



1789. Cardium retusum Bruguière (ex parte), Encyclopéd. Méthod., I, p. 210. 



1790. Cardium retusum Gmelin, Syst. Nat., (éd. XIII), p. 3245. 

 1797. Cardium excavatum Humphrey, Mus. Calonnianum, p. 49. 



1797. Bruguière, Encyclopéd. Méthod., pi. CCXCIV, fig. 3/J. 



1799. Cardium [Hemicardium] retusum Spengler, Skrivt. Nat. Selsk., V, p. 54. 



18 17. Cardium retusum Dillwyn, Descr. Cat., I, p. 112. 



18 19. Cardium retusum Lamarck, Anim. sans Vertèb., VI, p. 15. 



1824. Cardium retusum Dubois, Epitome, p. 'jj. 



