7' 



The "Siboga^ collection contains spécimens from near reef of Batjulmati, Java (St. 7), 

 Bay of Kankamaraân (St. 16), Bay of Labuan Tring, West Coast of Lombok (St. 19), Sailus 

 Ketjil, Paternoster Islands (St. 37), Bay of Badjo, West Coast of Flores (Stat. 50), Madura Bay 

 (St. 51), Anchorage off Dongala, Palos Bay, Celebes (St. 86), East side of Pajunga Island, 

 Kwandang Bay (St. 115), Anchorage off Sawan, Siau Island (St. 125), Anchorage off Laiwui, 

 Coast of Obi Major (St. 142), reef in Sanana Bay, east coast of Sula Besi (Stat. 193), Banda 

 Anchorage (St. 240), Anchorage off Kilsuin, west coast of Kur Island (St. 250), Anchorage 

 between Nusa Besi and the N. E. Point of Timor (St. 282) and Anchorage east of Dangar 

 Besar, Saleh Bay (St. 313). 



Genus Modiolus Lamarck. 



1799. Modiolus Lamarck, Mém. Soc. Hist. Nat. Paris, p. 87. 



1801. Modiola Lamarck, Syst. Anim. sans Vertèb., p. 113. 



1898. Modiolus Dali, Trans. Wagner Free Inst. Sci. Philadelphia, III, p. 794. 



1904. Modiola Jukes-Browne, Journ. Conch., XI, p. 101. 



1905. Modiola Jukes-Browne, Proc. Malacol. Soc. London, VI, p. 218. 

 191 3. Modiolus Suter, Man. New Zealand MolL, p. 865. 



1925. Modiolus Woodring, Miocène Mollusks from Bowden, Jamaica, Pelecypods etc., p. 84. 

 1930. Volsella Stewart, Spécial Publication Acad. Nat. Sci. Philadelphia, N'^ 3, p. 98. 



For définition of the genus and discussion as to synonymy and relationships référence 

 may be made to the works of Dall and Jukes-Browne. 



Stewart has replaced the generic name Modioltis Lamarck by Volsella Scopoli, but as 

 Mytihts modiolus of Scopoli was a misidentification, I with Dall and Jukes-Browne am not 

 prepared to accept this change. 



The type of the genus is Modiohts modiohis (Linn.). 



The genus has been divided into a number of subgenera and I hâve followed Jukes- 

 Browne in référence to the divisions of the genus. 



In the "Siboga" collection the genus is represented by species of the subgenera, Modio- 

 lus s. s = Eumodioliis von Ihering ^) and Amygdahim Megerle ^). 



I. Modiolus {Modiolus^ elongatus (Swainson). 



1841. Modiola elongata Swainson, Exotic Conch., p. 31, fig. 8. 



1843. Modiola Elongata Hanley, Rec. Biv. Shells, p. 337, pi. XXIV, fig. 28. 



1845. Modiola elongata Catlow & Reeve, Conch. Nomencl., p. 72. 



1855. Modiola elongata Berge, Conchylienbuch, p. 84. 



1857. Modiola elongata Reeve, Conch. Icon., X, Modiola, pi. II, fig. 4. 



1857. Perna elongata Adams, H. & A., Gen. Rec. MolL, II, p. 517. 



1860. Modiola elongata Reeve, Elem. Conch., II, p. 72, pi. XXIX, fig. 172. 



1874. Modiola elongata Tapparone-Canefri, Ann. Mus. Civ. Stor. Nat. Genova, VI, p. 566. 



1887. Modiola elongata Clessin in Martini %l Chemn. Conch. -Cab. (N. F.), VIII, (3) Mytilidae, 



p. 97, XXVII, fig. I. 

 1890. Modiola securis var. elongata Paetel, Cat. Conch. Samm., III, p. 197. 

 1905. Modiola elongata Hidalgo, Cat. Filip., p. 363. 



1909. Modiola elongata Lynge, D. Kgl. Dansk. Vidensk. Selsk. Skr. Nat. -Math., (7) V, p. 131. 

 191 1. Modiola elongata Pelseneer, "Siboga" Lamellibranches (Anat.), pp. 18, 19, pi. IV, figs. 6 — 9. 



i) Ihering, H. von — Proc. Malacol. Soc. London, IV, p. 87 (1900). See also Jukes-Browne, op. cit., p. 221 (1905). 

 2) Megerle, v. M , J. K. — Mag. Ces. Naturfor. Freund., V, p. 69 (1811), and Jukes-Browne, op. cit., p. 221 (1905). 



