62 



i843- Pectunculus pectinifonnis Reeve, Conch. Icon., I, Pectiniciiliis, pi. III, figs. \\a,b. 



1889. Pectunculus pectiniforinis Morlet, Journ. Conchyliol., XXXVII, p. 163. 



i8gi. PecUinculus pectunculus Smith (ex parte), Proc. Zool. Soc. London, pp. 432, 433. 

 1909. Pectunculus amhoinensis Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat.-Math., (7) V, p. 128. 

 19 12. Pectunaihis pectunculus var. aniboinensis Lamy, Journ. Conchyliol., LIX, p. 85. 



Smith was the first author to point out that two distinct species had been confused under 

 the spécifie name pectunczihts ^ and he revived Gmelin's name aniôoinensis for the form in which 

 the ribs are separated by narrow sulci only. In this he was followed by Lynge, but Lamy 

 considers amdoinensis only as a variety of the form G. pcctîinczilus in vvhich the ribs are 

 separated by well defined grooves and which are about half as broad as the ribs themselves. 

 I hâve examined the entire collection of thèse forms in the British Muséum (Nat. Hist.), London, 

 and though I agrée with Lynge that the colour of the hinge-plate, which Smith considered as 

 an important character for the differentiation of the two species, is not constant, there can be 

 no doubt about the two being quite distinct species. 



Distribution : — According to Lamy G. amboinensis is found in the Red Sea, Cochin- 

 China, Pulu Condor, Amboina, Java and New Caledonia, while Morlet recorded it from the 

 Gulf of Siam. 



In the "Siboga" collection it is represented by a half-grown shell collected from a reef 

 in Madura Bay, Molo Strait (St. 51) and two young shells from the Bank between the islands 

 of Bahuluwang and Tambolungan, South of Saleyer (St. 66) and inner side of the Muaras Reef, 

 East coast of Bornéo (St. 91) respectively. 



2. Glycymeris aiirifiuus (Reeve). 



1843. Pectunculus aicrifîuus Reeve, Proc. Zool. Soc. London, p. 34. 



1843. Pectunculus aurifiuus Reeve, Conch. Icon., I, Pectunculus, pi. IV, figs. \ja,b. 



1843. Pectunculus aurijluus Hanley, Rec. Biv. ShelLs, p. 165, pi. XIX, fig. 37. 



1845. Pectunculus aurijluus Catlow & Reeve, Conch. Nomencl., p. 51. 



1858. Axinaea [Pectunculus) aurijluus Adams, H. & A., Gen. Rec. Moll., II, p. 543. 



1860. Pectunculus aurijluus Reeve, Elem. Conch., II, p. 95. 



1862. Pectunculus aurijluus Chenu, Man. Conchyliol., II, p. 176, fig. 876. 



1890. Pectunculus [Pectunculus) aurijluus Paetel, Cat. Conch. Samm., III, p. 21. 

 1896. Pectunculus aurifiuus Casto de Elera, Cat. Sist. Filip., p. 804. 



1905. Pectunculus aurijluus Hidalgo, Cat. Moll. Filip., p. 52. 



191 1. Pectunculus aurijluus Pelseneer, "Siboga" Lamellibranches (Anat.), p. 7, pi. I, figs. 5 — 7. 



19 12. Pectunculus aurijluus Lamy, Journ. Conchyliol., LIX, p. 87. 



Reeve's description of this species being distinguishable by "its very bright orange 

 painting" is of no value whatever, as even the shells from the original locality, Island of Capul, 

 Philippines from the "Cuming Collection" in the British Muséum, (Nat. Hist.), London, do not 

 ail hâve the bright orange painting; several of the transverse patches are of a chocolaté or even 

 blackish brown colour. Lamy, however, pointed out the main distinguishing characters of the 

 species in référence to G. pccliniformis of Lamarck (= G. pechincultts of Linn.) is that its 

 umbones are strongly recurved forwards and instead of being placed about the centre of the 

 ligamental area are situated near its anterior extremity. It may also be noted that compared to 

 this species the shells of G. aiirijiiLus are much higher in proportion to the length and are 

 much more orbicular in shape. The obsolète grooving of the radial ribs to which Reeve refers 



