1905. Tellina inicans Hidalgo, Cat. Filip., p. 315. 



1906. Tellina [Peî'onaea] viicans Melvill & Standen, Proc. Zool. Soc. London, p. 828. 

 1906. Psainmobia micans Smith, Ann. Mag. Nat. Hist., (7) XVIII, p. 260. 



1909. Tellina {Peronaea) viicans Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat. Math., (7) 



V, p. 204. 

 1928. Tellina [Tellina) inicans Faustino, Summary Philippine Mar. Freshw. Moll., p. 87. 



A large séries of shells collected by the "Siboga" Expédition at various stations agrée 

 in ail respects with the types of T. micans Hanley in the British Muséum (Nat. Hist.), London. 

 The largest shell in the "Siboga" collection is much larger (32 mm. as compared to 22 mm. in 

 length), and is much thicker, more opaque and more rostrate. 



Distribution : — T. (P.) micans was described from the Philippines, but has since been 

 recorded from Aden, Persian Gulf and the Gulf of Siam. 



The "Siboga" Expédition collected shells of this species in the Bay of Labuan Tring, 

 west coast of Lombok (St. 19), Waru Bay, north coast of Ceram (St. 174), Saleyer Anchorage 

 (St. 213) and Sapeh Bay, east coast of Sumbawa (St. 311). 



27. Tellina [Peronidia) cygmis Hanley. 



1844. Tellina Cygniis Hanley, Proc. Zool. Soc. London, p. 144. 



1846. Tellina cygmis Hanley in Sowerby, Thés. Conch., I, p. 310, pi. LIX, fig. 122. 



1856. Tellina [Peronaea] cygmis Adams, H. & A., Gen. Rec. Moll., II, p. 398. 



1860. Tellina cygmis Reeve, Elem. Conch., II, p. 125. 



1867. Tellina cygnus Sowerby in Reeve, Conch. Icon., XVII, Tellina, pi. XXIX, fig. 157. 



1868. Tellina aequistriata and T. prodncta Sowerby, op. cit., pi. XLV, fig. 265, pi. XLVI, 



fig. 267. 

 1868. Tellina [Peronaea) cygmis Tryon, Amer. Journ. Conch., IV, p. 97. 

 187 1. Tellina [Peronaea) cygmis Romer, in Martini-Chemn. Conch. -Cab. (N. F.), X (4), Tellina, 



p. 124. 

 1878. Tellina [Peronaea) cygnus Bertin, Nouv. Arch. Mus. d'Hist. Nat. Paris, (2) I, p. 271. 

 1890. Tellina [Peronaea) cygnus Paetel, Cat. Conch. Samm., III, p. 45. 

 1896. Tellina [Tellinella) Cygneiis (sic), Casto de Elera, Cat. Sist. Filip., p. 734. 

 1903. Tellina [Peronaea) cygnus Standen & Leicester, Ceyion Pearl Oyster Rept., V, p. 294. 

 1903. Tellina Cygnus Hidalgo, Obras Malacol., II, p. 124. 

 1905. Tellina Cygnus Hidalgo, Cat. Filip., p. 314. 

 1909. Tellina [Peronaea) cygnus Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat. Math., (7) 



V, p. 204. 

 1928. Tellina [Tellina) cygnus Faustino, Summary Philippine Mar. Freshw. Moll., p. 85. 



After a careful comparison of the types of T. cygnus^ P. aequistriata and T. producta 

 I consider them ail as based on slightly différent shells of the same species. Hanley described 

 the sculpture of the species as "concentrically substriated", but Sowerby in "Conch. Icon." 

 described it as "smooth". His tvvo new species T. prod^icta from Hong-Kong and T. aequistriata 

 based on a shell of unknown habitat hâve to be included in the .synonymy of T. [P.) cygnus. 



The ovate-oblong shells of P. [P.) cygnus are distinctly rostrate, and the surface is covered 

 with very minute, very regular, concentric striae. 



Distribution : — P. [P.] cygnus has been recorded from China, the Philippines, New 

 Caledonia and the Gulf of Siam. 



The "Siboga" Expédition collected a few shells at Macassar (St. 71). 



