I50 



1905. Isocardia Moltkiana Hidalgo, Cat. Filip., p. 348. 



1906. Isocardia moltkiana Owston, Japan. Loochooan Shells, p. 35. 



1906. Isocardia moltkiana Bulow, Nachrichtsbl. Deutsch. Malakozool. Ges., XXXVIII, p. 37. 

 1909. Isocardia moltkiana Hedley, Proc. Linn. Soc. N. S. Wales, XXXIV, p. 430. 



1909. Isocardia (Meiocardia) moltkiana Melvill, Trans. Linn. Soc. London (ZooL), XIII, p. 130. 



1910. Isocardia moltkiana Hedley, Austral. Ass. Adv. Sci., XII, p. 349. 



1920. Isocardia [Meiocardia] moltkeana Lamy, Journ. ConchylioL, LXIV, p. 297. 

 1928. Isocardia moltkiana Faustino, Summary Philippine Mar. Freshw. Moll., p. 65. 



/. {M^ moltkiana is a very distinct species, of a small size, with the ribs much broader, 

 coarser and distantly placed, and the ridge marking off the escutcheon much more strongly 

 developed. The shell is also comparatively much thicker. I cannot agrée with Rômer (loc. cit., 

 p. 8) that the only différences between /. (Af.) moltkiana and /. [M^i vulgaris are the différent 

 size and the greater curvature of the ridges running forwards from the umbones in the former 

 species. Lamy also is wrong in suggesting that the spécimen fîgured as /. tnoltkiana by Reeve 

 in "Conch. Icon." — pi. I, fig. i — does not represent the typical form ; he proposed the varietal 

 name sangnineo})zac7ilata Dunker for it. 



Distribution : — The species vvas described from spécimens of unknown habitat, but 

 Chemnitz believed them to hâve corne from the Eastern Seas. Reeve's spécimens were from the 

 Philippines and the species has also been recorded from the Australian waters. 



The "Siboga" Expédition dredged two young shells on the bank between Islands of 

 Bahuluwang and Tambolungan, South of Saleyer (St. 66). 



2. Isocardia [Meiocardia) vulgaris Reeve. 



1830. Isocardia Moltkiana Sowerby (non Spengler), Gen. Shells, II, Isocardia, fig. 3. 



1837. Isocardia Dussumieri Valenciennes MSS. in Cuvier's Animal Kingdom, pi. XXXIII, 



figs. 2, 2 a. 



1845. Isocardia vulgaris Reeve, Conch. Icon., II, Isocardia, pi. I, figs. 2a, b. 



1853. Isocardia vulgaris Môrch, Cat. Yoldi, II, p. 38. 



1856. Isocardia vulgaris Hanley, Rec. Biv. Shells, p. 370, pi. XVIII, fig. 33. 



1857. Bucardia [Meiocardia) vulgaris Adams, H. & A., Gen. Rec. Moll., II, p. 461. 

 1860. Isocardia vulgaris Reeve, Elem. Conch., II, p. 104. 



1862. Isocardia [Meiocardia] Moltkiana Chenu, Man. ConchylioL, II, p. 113, fig. 533. 



1867. Isocardia vulgaris Mitchell, Cat. Mus. Madras, p. ÇtJ. 



1868. Isocardia [Meiocardia) vulgaris Rômer in Martini-Chemn. Conch. -Cab. (N. F.), X (2), 



Cardiacea, p. 9, pl. I, figs. 8, 9. 



1869. Meiocardia vulgaris Frauenfeld, Verhandl. Zool.-Bot. Ges. Wien XIX, p. 884. 



1878. Isocardia [Meiocardia) vulgaris Kobelt, lUustr. Conchylienbuch, p. 347, pl. CII, fig. il. 

 1884. Isocardia [Meiocardia) Moltkiana Tryon, Struct. Syst. Conch., III, p. 189, pl. CXIV, fig. 56. 

 1890. Isocardia [Meiocardia) vulgaris Paetel, Cat. Conch. Samm., III, p. 120. 



1895. Isocardia vulgaris Cooke, Cambridge Nat. Hist., Moll., III, p. 451, fig. 305. 



1896. Isocardia vulgaris Casto de Elera, Cat. Sist. Filip., p. 775. 



1898. Isocardia vulgaris Melvill & Sykes, Proc. Malacol. Soc. London, III, p. 46. 



1901. Isocardia vulgaris Sturany, Denkschrift. Kais. Akad. Wiss. Wien, Math. Nat., LXIX, p. 267. 



1906. Isocardia vulgaris Bùlow, Nachrichtsbl. Deutsch. Malakozool. Ges., XXXVIII, p. 37, 



pl. II, fig. 5- 

 191 5. Isocardia Moltkiana Lamy, Bull. Mus. d'Hist. Nat. Paris, XXI, p. 251. 

 1920. Isocardia [Meiocardia) Moltkiana var. vulgaris Lamy, Journ. Conrhyliol., LXIV, p. 297. 



The shell of /. (^T/.) vulgaris is not so high as that of /. [M^ lamarcki., but is more 



