146 



4- Cardita ( Venericardia) ovalis Reeve. 



1843. Cardita ovalis Reeve, Conch. Icon., I, Cardita, pi. VI, fig. 2'jc. 



1844. Cardita ovalis Reeve, Proc. Zool. Soc. London (vol. for 1843), P- 193- 



1845. Cardita ovalis Catlow & Reeve, Conch. Nomencl., p. 46. 

 1857. Actinobolus ovalis Adams, H. & A., Gen. Rec. MolL, II, p. 487. 



1870. Actinohnlus (sic) ovalis MacAndrew, Ann. Mag. Nat. Hist., (4) VI, p. 448. 

 1884. Cardita ovalis Grasset, Ind. Test. Viv., p. 283. 



1887. Cardita ovalis Clessin, in Martini-Chemn. Conch. -Cab. (N. F.), X (I), Carditacca, p. 7, 



pi. V, figs. 8, 9. 



1890. Cardita ovalis Paetel, Cat. Conch. Samm., III, p. 140. 



1896. Cardita ovalis Casto de Elera, Cat. Sist. Filip., p. 786. 



1905. Venericardia ovalis Hidalgo, Cat. Filip., p. 361. 



191 1. Cardita ovalis Pelseneer, "Siboga" Lamellibranches (Anat,), p; 38, pi. XIII, fig. 2. 



1922. Venericardia [Cardites) ovalis Lamy, Journ. ConchylioL, LXVI, p. 327. 



1928. Venericardia ovalis Faustino, Summary Philippine Mar. Freshw. Moll., p. 51. 



C. (F.) ovalis is, as was pointed out by Lamv, closely allied to C. [V.) nitida Reeve 

 from the Philippine Islands, but is easily distinguished by the much smaller number of ridges 

 (18 — 19) on the surface of the shells. The interspaces between the ribs in the case of C. (V.) 

 ovalis are comparatively broader than those of C. ( K) nitida. The smoothness of the posterior 

 ribs, which is considered of importance by both Reeve and Lamy, becomes marked only in 

 adult shells ; in young shells ail the ribs are crenated, and the middle ones appear almost beaded. 



Distribution: — C. [V.) ovalis was described from the Philippines. MacAndrew has also 

 recorded it from the Gulf of Suez. 



The "Siboga" Expédition collected a fair séries of young shells from the Bay of Pidjot, 

 Lombok (St. 33), Anchorage off Lirung, Salibabu Island (St. 133) and Anchorage east of 

 Danger Besar, Saleh Bay (St. 313). 



5. Cardita [Venericardia) castanea Deshayes. 



1854. Cardita castanea Deshayes, Proc. Zool. Soc. London (vol. for 1852), p. 102, pi. XVII, fig. 1 1. 



1888. Cardita castanea Clessin in Martini-Chemn. Conch. -Cab. (N. F.), X (I), Carditacea, p. 21., 

 1890. Cardita castanea Paetel, Cat. Conch. Samm., III, p. 140. 



DuRiNG growth C. ( K.) castanea undergoes a great deal of change in the sculpture of 

 the shells. The ridges on the young shells and even on the beak of older shells are somewhat 

 rounded and greatly crenated. Lower down, however, the ridges become flatter and appear almost 

 smooth. The interspaces are moderately deep and narrow. 



Distribution: — C. (V.) castanea was described from the Australian waters. 



The "Siboga" Expédition collected a fair séries of young and half grown shells from 

 the Anchorage off Djankar, Java (St. 4), Bay of Pidjot, Lombok (St. 33), Bay of Bima (St. 47), 

 Macassar (St. 71), Anchorage off North Ubian (St. 99), Sulu Harbour, Sulu Island (St. 104) 

 and Anchorage east of Dangar Besar, Saleh Bay, (St. 3 1 3). 



Remarks : — Lamv ^) considered this species to be closely allied to the Red Sea form 

 C. ( F.) rnfa Laborde. 



i) Lamy, E. — Journ. ConchylioL, LXVI, p. 324 (1922). 



