198 



guôernaculum. In the British Muséum (Nat. Hist.), London there are five shells from Bombay 

 which undoubtedly belong to this species. In the "Siboga" collection there is a single, partly 

 damaged left valve, which I refer to this species. 



Distribution : — M. {P.) arafiirensis was described from the Arafura Sea, but as remarked 

 above, it appears to be a widely distributed species. 



In the "Siboga" collection the species is represented by a single left valve dredged at 

 St. 99 (Anchorage north of Ubian, 16 — 23 mètres). 



Family Scrobiculariidae. 



Genus Semele Schumacher. 



181 7. Semele Schumacher, Essai Nouv. Syst., p. 165. 



18 18. AmpJiides-ina (ex parte), Lamarck, Anim. sans Vertèb., V, p. 489. 

 1887. Semele Fischer, P., Man. Conchyliol., p. 1153. 



1900. Semele Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 985. 

 19 14. Semele Lamj', Journ. Conchyliol., LXI, p. 314. 



A detailed discussion and description of the genus Semele is to be found in Lamy's work 

 cited above. The génotype is Setnele profiaia (Pulteney). 



1 . Seuiele jukesii (Reeve). 



1853. AmpJiides»ia Jukesii Reeve, Conch. Icon., VIII, Amphidesma, pi. II, fig. 7. 



1854. Semele Jukesi Adams, A., Froc. Zool. Soc. London (vol. for 1853), p. 95. 

 1856. Semele Jukesii Adams, H. & A., Gen. Rec. MolL, II, p. 411. 



1860. Amphidesma Jukesii Reeve, Elem. Conch., II, p. 135. 



1863. Semele Jukesii Tryon, Amer. Journ. Conch., IV, p. 120. 



1880. Amphidesma Jukesi von Martens, Mobius Beitràge Meeresf. Mauritius, Seychell., p. 328. 



1890. Amphidesma Jukesi Paetel, Cat. Conch. Samm., III, p. Ç>i. 



1899. Semele jukesi Melvill & Standen, Journ. Linn. Soc. London (Zool.), XXVII, p. 201. 



1903. Semele Jukesi Smith, Faun. Geogr. Maldive, Laccadive Archipel., II, p. 627. 



1903. Semele Jukesi Hidalgo, Obras Malacol., II, p. 69. 



1905. Semele Jukesi Hidalgo, Cat. Filip., pp. 264, 304. 



1910. Semele Jukesii Hedley, Austral. Ass. Adv. Sci., XII, p. 350. 



19 14. Semele Jukesi Lamy, Journ. Conchyliol., LXI, p. 341. 



1928. Semele jukesi Faustino, Summary Philippine Mar. Freshw. Moll., p. 96. 



The two valves, which I assign to this species, are young, and hâve not developed either 

 the exact form or the heavy shell of this species. The hinge, sculpture and even the gênerai 

 form correspond to that of Adam's species. 



Distribution : — S. jukesii was originally described from the Torres Straits, Australia, 

 but has since been recorded from the Philippines, Singapore, Laccadive and Maldive Archipelago 

 and Mauritius. 



The "Siboga" Expédition dredged two young valves in the Bay of Bima (St. 47). 



2. Semele exarata (Adams & Reeve). 



1848. Amphidesma exarata Adams, A. & Reeve, Zool. Voy. "Samarang", Moll., p. 81, pi. XXIV, 

 fig. 9. 



