290 



i857- Hemicardia (Fragum) donaciforme Adams, H. & A., Gen. Rec. Moll., II, p. 458. 



1862. Adacna [Didacna] donacifonne Chenu, Man. Conchyliol., II, p. 112, fig. 529. 



1867. Cardiiim Australiense Angas, Proc. Zool. Soc. London, p. 925. 



1869. Cardiuin [Fragum) donacifonne Romer, in Martini-Chemn. Conch.-Cab. (N. F.), X (2), 



Cardiacea, p. 109, pi. IV. fig. 13, pi. XIV, figs. 16, 17 (also var. australiense Reeve). 

 1880. Heinicardium donacifonnis Brazier, Proc. Linn. Soc. N. S. Wales, V. p. 7. 

 1884. Adacna donaciforniis, Grasset, Ind. Test. Viv., p. 276. 



1877. Adacna [Didacna) donacifonnis Tryon, Struct. Syst. Conch., III, p. 195, pi. CXVI, fig. 86. 

 1888. Hemidonax donacifonnis Fischer, P., Man. Conchyliol., p. i 101. 

 1896. Hemicardium [Fragum) donaciformis Casto de Elera, Cat. Sist. Filip., p. 774. 

 1900. Hemidonax donaciformis Dali, Proc. U. S. Nat. Mus., XXIII, p. 385. 

 1903. Hemidonax donacifonne Hidalgo, Obras Malacol., II, p. 357. 

 1905. Hemidonax Donacifonne Hidalgo, Cat. Filip., p. 346. 



191 1. Hemidonax donaciformis Pelseneer, "Siboga" Lamellibranches (Anat.), p. 38, pi. XIII, fig. 4. 

 1928. Cardiuin [Hemicardium) doiaciforme Faustino, Summary Philippine Mar. Freshw. Moll., 



p. 61. 



Reeve's species Cardiuin atistraliense is, as I hâve satisfied myself by examination of 

 Reeve's types, a sjnonym of H. donacifonne. 



The thick shell of this species is ornamented with regular radial rido^es and a few concentric 

 threads, and the gênerai form in ail the shells that I hâve examined, is remarkably constant. 



Distribution : — H . donacifonne is known from round the Philippines and the Australian seas. 



In the "Siboga" collection the species is represented by 2 shells collected in the Bay of 

 Labuan Tring, west coast of Lombok (St. 19) and Anchorage off Beo, Karakelang Islands 

 (St. 131) respectively. 



Family Trid.\cnidae. 

 Genus Tridacna Lamarck. 



1799. Tridacna, Lamarck, Mem. Soc. Hist. Nat. Paris, p. 86. 



1857. Chametrachaea Adams, H. & A., Gen. Rec. Moll., II, p. 464. 



1862. Tridacna Reeve, Conch. Icon., XIV, Tridacna pi. I (explanation). 



1868. Tridacna Kùster in Martini-Chemn. Conch.-Cab. (N. F.), VIII (4), Tridacna etc., p. 3. 



1887. Tridacna Fischer, P. Man. Conchyliol., p. 1034. 



1927. Tridacna Cox, Rept. Palaeontol. Zanzibar, p. 99. 



Most authors hâve accepted Brugière as the author of the genus Tridacna, but his 

 publication of the mère name on pi. CCXXXV of "Encyclopéd. Méthod." in 1797^) without 

 any description or citation of type cannot be accepted as establishing the genus. The next 

 author to use the name was Lamarck in 1799, and I hâve, therefore, accepted Tridacna as 

 a genus of this author. 



Chlidren ") selected Tridacna gigas (Linn.) as the génotype. 



I . Tridacna sqtiamosa Lamarck. , i 



174 1. Chaîna squamosa etc., Rumph, Amboin. Rarit., p. 109, pi. XLII, fig. A. 



1742. Concha ivibricata etc., Gualtieri, Ind. Test., pi. XCII, figs. F, G, pi. XCIII, fig. B. 



i) The earlier usage of this name by Brugière was, as is pointed out by Shereorn — Ind. Animalium, p. 990 (1902) of the 

 vernacular name and not the Latin name Tridacna. 



2) Children, J. g. — Quart. Jouin. Sci. Lit. Arts., XV, p. 31 (1823). 



