137 



(St. 193), Saleyer Anchorage (St. 213), Anchorage off Pasir Pandjang, west coast of Binongka 

 (St. 220), Ambon Anchorage (St. 231), Nalahia Bay, Nusa Laut Island (St. 234), Banda Anchorag'e 

 (St. 240), Anchorage off Kilsuin,, west coast of Kur Island and Pepela Bay, east coast of Rotti 

 Island (St. 301). 



3. Pinna [Atrind) penna Reeve. (Plate IV, figs. 14, 15). 



1858. Pinna penna Reeve, Conch. Icon., XI, Pinna, pi. XXI, fig. 39. 



1860. Pinna penna Reeve, Elem. Conch., II, p. 69. 



1888. } Pinna penna '^ows.'i&'à.wm.ç:, Mém. Soc. Zool. France, I, p. 220. 



1890. Pinna penna Paetel, Cat. Conch. Samm., III, p. 209. 



1891. Pinna penna Clessin in Martini-Chemn. Conch. -Cab. (N. F.), VIII (i), Malleacea, p. 87, 



pi. XXXVI, fig. 2. 

 1896. Pinna [Atrina] penna Casto de Elera, Cat. Sist. Filip., p. 799. 

 1905. Pinna penna Hidalgo, Cat. Filip., p. 370. 

 191 1. Pinna penna Pelseneer, "Siboga" LamelUbranches (Anat.), pi. IX, fig. 10. 



Dall ^) and following him Winckworth ^) hâve identified P. sqiLamosissiina Philippi ^) 

 with P . serrata Sowerby *) of unknown habitat, and Winckworth has suggested that the reputed 

 locality "Philippines" of P. [A}j penna, "is, I fancy, wrong, as is the case with so many of 

 Reeve's localities. The type-specimen looks like a young squamosissima = serrata'\ In view of 

 the "Siboga" expédition having collected a number of spécimens, which are identical with Reeve's 

 type of P. {A.) penna^ I am unable to agrée with the above conclusion. 



The shell of P. {A.) penna is very thin, elongated triangular, very slightly arched, with 

 the upper margin almost straight and the lower straight in the posterior half to two-thirds and 

 then suddenly curving forwards to the umbonal région. The surface of the shell in the dorsal 

 limb is very densely ridged, and the ridges, which are low, are covered with very minute scaîes 

 near the basai part and in the middle, but become much larger near the posterior margin ; the 

 ventral limb except in the umbonal area bears fine, uneven wrinkles. 



P. [A.) penna appears to be allied to P. [A.) strangei Reeve, but is distinguished by 

 its much finer texture of shell and more minute sculpture. I cannot agrée with Hedley ^) that 

 P. penna is only a synonym of Atrina inflata of Dillwyn. 



Distribution: — - P. [A.) penna wsls described from the Philippine Islands. Jousseaume's 

 record of the species from Aden is open to question. 



In the "Siboga" collection P. penna is represented by spécimens from Haingsisi, Samau 

 Island, Timor (St. 60), Sulu Harbour, Sulu Island (St. 104), Banda Anchorage (St. 240), St. 260 

 (5°36'.5S., i32°55^2E.) and Anchorage east of Dangar Besar, Saleh Bay (St. 313). 



4. Pinna [Atrina^ pectinata Linn. 



1767. Pinna pectinata Linnaeus, Syst. Nat., (éd. XII), p. 1160. 



1823. Pinna cancellata Mawe, Linn. Syst., p. jj. 



1857. Pinna {Atrina) pectinata Adams, H. & A., Gen. Rec. Shells, II, p. 530. 



i) Dall, W. H. — Nautilus, XI, p. 26 (1897), also see Dall, W. H. — Trans. Wagner Free Iiist. Sci. Philadelphia, 111(4). 

 pp. 664—665 (1898). 



2) Winckworth, R. — Proc. Malacol. Soc. London, XVIII, p. 294 (1929). 



3) Philippi, R. A. — In Roemer, C. F., Texas, p. 454, (Bonn, 1849). 



4) Sowerby, G. B. — Tankerville Cat. Appendix, p. 5 (1825) and Gen. Rec. Fossil MolL, I, pi. CII (1825). 



5) Hedley, C. — Rec. Austral. Mus., XIV, p. 151 (1924). 



SIBOGA-EXPEDITIE \A\\C. l8 



