48 



g. Arca {Barbatid) parva (Sowerby). 



833. Byssoarca parva Sowerby, Proc. Zool. Soc. London, p. 19. 



844. Arca parva Reeve, Conch. Icon., II, Arca, pi. XVII, fig. 119. 



845. Arca parva Catlow & Reeve, Conch. Nomencl., p. 50. 

 848. Arca parva Nyst, Mém. Acad. Roy. Belgique, XXII, p. 52. 

 857. Arca [Barbatia) parva Adams, H. & A., Gen. Rec. Moll., II, p. 535. 

 860. Arca parva Reeve, Elem. Conch., II, p. 93. 



870. Arca parva Mac Andrew, Ann. Mag. Nat. Hist., (4) VI, p. 449. 



874. Arca parva Dunker, Cat. Mus. Godeffroy, V, p. 178. 



886. Arca parva Cooke, Ann. Mag. Nat. Hist., (5) XVIII, p. 93. 



890. Barbatia [Aca7') parva Paetel, Cat. Conch. Samm., III, p. 214. 



891. Arca [Barbatia] parva Kobelt in Martini, Chemn. Conch. -Cab., (N. F.), VIII (2), Arca, 

 p. 197, pi. XLVII, fig. 7. 



904. Arca [Barbatia] parva Lamy, Bull. Mus. d'Hist. Nat. Paris, X, p. 272. 



906. Arca [Barbatia] parva Lamy, Bull. Mus. d'Hist. Nat. Paris, XII, p. 317. 



907. Arca [Barbatia] parva Lamy, Journ. Conchyliol., LV, p. 51. 



909. Arca [Barbatia) parva Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat. -Math., (7) V, p. 1 14. 



909. Arca [Barbatia] parva Lamy, Mém. Soc. Zool. France, XXII, p. 335. 



911. Arca [Barbatia] parva Pelseneer, "Siboga" Lamellibranches (Anat.), p. 15. 



917. Arca [Barbatia] parva Lamy, Bull. Mus. d'Hist. Nat. Paris, XXIII, p. 27. 



929. Arca [Barbatia] parva Dautzenberg, Faun. Colon. Français., III, p. 576. 



I hâve nothing to add to Kobelt's detailed description of this species, but agrée with 

 Lamy that it is not possible to unité it with Lamarck's A. pistacJiia. It is a very beautiful, 

 small-sized species, vi^ith an ovate-oblong shell having numerous radiating and concentric striae 

 cutting off the ridges into closely spaced granules of squarish or rectangular shape. 



Distribution: — A. {B.) parva has been recorded froni the Guif of Suez, the Red Sea, 

 Madagascar, Persian Gulf, Gulf of Siam, Tahiti, Ducie's Island etc. 



In the "Siboga" collection it is represented by young stray valves not exceeding 10 mm. 

 in length from the Bay of Kankamaraan (St. i 6), Bay of Labuan Tring, West coast of Lombok 

 (St. 19), Bay of Pidjot, Lombok (St. 33), Paternoster Islands(St. 37), St. 43^ (7° i 5'.5 S., 1 18° 12^.3 E.), 

 Bay of Nangamessi, Sumba (St. 53), Bank between islands of Bahuluwang and Tambolungan, 

 south of Saleyer (St. 66), Tawi-Tawi Islands, Sulu Archipelago (St. 93), St. 98 (6°9'N., 120° 21' S.), 

 St. 164 (i°42'.5 S., i30°47'.5 E.), Anchorage off Pasir Pandjang (St. 220) and Macassar. 



10, Arca [Barbatid) radula Smith. 



1885. Arca [Barbatia] radula Smith, "Challenger" Lamellibranchia., p. 260, pi. XVII, figs. 3 — 3b. 

 1891. Arca [Barbatia] radula Kobelt in Martini Chemn. Conch. -Cab., (N. F.), VIII (2), Arca, p. 219. 

 1907. Arca [Barbatia) fasciata var. radula Lamy, Journ. Conchyliol., LV, p. 50. 



Smith was the first author to publish a description and figures of the species, and there 

 is no reason whatsoever why the name of the author of the species should be A. Adams 

 instead of Smith. A. [B.) radula, as Smith pointed out, is closely allied to A. parva, and I 

 can not agrée that it is a variety of A. fasciata Reeve. 



Distribution: — A. {B.) radîila had so far been recorded from South Australia. In the 

 "Siboga" collection there is a single spécimen from near the Kei Islands (St. 260) which, after 

 comparison with Smith's types, I assign to this species. 



