1890. Penia inarstiphim Paetel, Cat. Conch. Samm. III, p. 207. 



1891. Perna marsnpium Clessin in Martini-Chemn. Conch. -Cab. (N. F), VIII (I), Malleacea, 



p. 32, pi. X, fig. 4. 

 1928. Pedalion niarsitpium Faustino, Summary Philippine Mar. Freshw. MoUusks, p. 25. 



- The shell of /. marsupiale varies a great deal in outline^ from subquadrate to orbicular 

 or even elongated subovoidal. The shell is usually thick and solid, and on the surface the valves 

 are concentrically but often somewhat irregularly laminated. The nacreous layer of the shells 

 varies from dull pearl white to deep purple or violet. 



Distribution : — /. marsupiale has so far been recorded from the Philippines. 



In the "Siboga" collection the species is represented by a fair séries of shells from the 

 Bay of Labuan Tring, West coast of Lombok (St. 19), Anchorage off Kawio and Kamboling 

 Islands, Karkaralong Group (St. 129), Sanana Bay, East coast of Sula Besi (St. 193), Ambon 

 Anchorage (St. 231), Nalahia Bay, Nusa-Laut Island (St. 234) and Anchorage off Kilsuin, West 

 coast of Kur Island (St. 250). 



8. Isognomon legumen (Gmelin). 



\'j'è\.- Siliqna spengleri Chemnitz, Conch. -Cab., VII, p. 250, pi. LIX, fig. 578. 

 788. Siliqua spengleri Schroter, Conch. -Cab. Namen Reg., p. 96. 



790. Ostrea legumen Gmelin, Syst. Nat., (éd. XIII), p. 3339. 



791. Perna dactylus Valenciennes, Encyclopéd. Méthod., pi. CLXXV, figs. 2, 3. 

 802. Ostrea legumen Bosc, Hist. Nat. Coq., II, p. 283. 

 817. Ostrea legumen Dillwyn, Descr. Cat., I, p. 283. 

 819. Perna legumen Lamarck, Anim. sans Vertèb.., VI, p. 142. 

 825. Ostrea Legumen Wood, Ind. Test., p. 53, pi. XI, fig. 83. 

 836. Perna legumen Deshayes in Lamarck, Anim. sans Vertèb., VII, p. 78. 

 843. Perna Legumen Hanley, Rec. Biv. Shells, p. 259. 

 845. Perna legumen Catlovv & Reeve, Conch. Nomencl., p. 'jj. 



856. Ostrea legumen Hanley in Wood, Ind. Test., p. 63, pi. XI, fig. 83. 



857. Isognomon legumen Adams, H. & A., Gen. Rec. Moll., II, p. 527. 



858. Perna caudata, P. lingîiaeformis, P. laticostata and P. legumen Reeve, Conch. Icon., XI, 

 Perna, pi. I, fig. 5, pi. II, figs. 7, 9 and pi. V, fig. 22. 



860. Isognomon [Perna) caudata (ex parte), Cooke, Ann. Mag. Nat. Hist., (5) XVII, p. 138. 



887. Perna legumen von Martens, Journ. Linn. Soc. London (ZooL), XXI, p. 204. 



888. Perna legumen Jousseaume, Mém. Soc. Zool. France, I, p. 219. 



890. Perna legumen, P. caudata, P. latecostata (sic) and P. linguaeformis Clessin in Martini- 

 Chemn. Conch. -Cab. (N. F.), VIII (i), Malleacea, p. 28, pi. IX, fig. 3; p. 30, pi. IX, 

 fig. 4; p. 36, pi. XIII, fig. 4; p. 40. 



1909. Perna spengleri Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat. Math., (7) V, p. 146. 



As remarked by Lynge there can be no doubt that Gmelin 's species /. legzimen is 

 synonymous with the species figured by Chemnitz as Sihqna spengleri. Further as Cooke stated, 

 the Reevian species cattdata, linguaeformis and laticostata are ail based on slightly différent 

 shells of this very variable species. 



Distribution: — /. legumen is widely distributed from the Red Sea to the Pacific Océan. 



The "Siboga" Expédition collected spécimens from the Anchorage off Kawio and Kamboling 

 Islands, Karkaralong Group (St. 129), Anchorage off Laivvui, Coast of Obi Major (St. 142)^ 

 Sounding due West, 1300 M. distant from the North point of Kabia Island Reef (St. 215), 

 Ambon Anchorage (St. 231) and Kulewatti (Sollot) Bay, Dammer Island (St. 277). 



