175 



18/6. Cyrena Ceylanica Sowerby in Reeve, Conch. Icon., XX, Cyrena, pi. XIX, fig. iri. 



1877. Cyrena ceylonica Clessin in Martini-Chemn., Conch. -Cab. (N. F.), IX, ['^, Cycladeen,'^.\02, 



pi. XVII, figs. I, 2, pi. XVIII, figs. I, 2. 



1878. Cyrena ceylonica Kobelt, lUustr. Conchylienbuch, p. 341, pi. C, fig. 9. 

 1884. Cyrena Ceylanica Grasset, Ind. Test. Viv., p. 270. 



1890. Cyrena Ceylonica and C. pallida Paetel, Cat. Conch. Samm., III, pp. 97, 98. 



1891. Cyrena Ceylanica Fischer, P., Bull. Soc. Hist. Nat. d'Autun, IV, p. 235. 

 1904. Cyrena ceylanica Fischer, H. & Dautzenberg, Mission Pavie, Moll., p. 440. 

 191 5. Cyrena ceylonica Preston, Faun. Brit. Ind. Freshw. Moll., p. 202. 



1921. Cyrena ceylonica Prashad, Rec. Ind. Mus., XXII, p. 142, pi. XX, figs. 11 — 13. 



Solander's spécifie name erosa must hâve priority over Gmelin's later coaxans and the 

 later Lamarckian zeylanica. G. erosa is a widespread species, and spécimens even from the 

 same locaHty differ in form, sculpture and thickness of shells. 



Distribution : — G. erosa is the common species of the Indian Océan, and its range 

 extends further east into the Pacific Océan. 



In the "Siboga" collection it is represented by shells dredged at St. 164 (i°42'.5S., 

 i30°47',5 E., 32 mètres). 



2. Geloina bengalensis (Lamarck). 



18 18. Cyrena Bengalensis Lamarck, Anim. sans Vertèb., V, p. 564. 



1824. Cyrena Bengalensis Dubois, Epitome, p. Ç)6. 



1825. Cyrena Bengalensis Sowerby, Cat. Tankerville, p. 12. 



1834. Cyrena turgida Lea, Trans. Amer. Phil. Soc, V, p. 109, pi. XVIII, fig. 53. 



1834. Cyrena turgida Lea, Observ. Gen. Unio, I, p. 221, pi. XVIII, fig. 53. 



1835. Cyrena Bengalensis Deshayes, in Lamarck, Anim. sans Vertèb., VI, p. 276. 



1841. Cyrena bengalensis Delessert, Rec. Coq. Lamarck, pi. VII, figs. 6a, b. 



1842. Cyrena Bengalensis and C. turgida Hanley, Rec. Biv. Shells, p. 93. 

 1845. Cyrena Bengalensis Catlow & Reeve, Conch. Nomencl., p. 30. 



1848. Cyrena Bengalensis Chenu, Illustr. Conchyliol., Cyrena, pi. II, figs. 6a — c. 

 1854. Cyrena turgida and C. Bengalensis Deshayes, Cat. Conch. Brit. Mus., Petricolidae, etc., 

 II, pp. 242, 243. 



1856. Cyrena Bengalensis and C. turgida Hanley, Rec. Biv. Shells, Appendix, p. 7, pi. XIII, 



fig. 14, p. 10, pi. XIV, fig. 50. 



1857. Cyrena Bengalensis and C. turgida Adams, H. & A., Gen. Rec. Moll., II, p. 446. 

 1867. Cyrena Bengalensis Mitchell, Cat. Mus. Madras, p. 66. 



1870. Cyrena Bengalensis Prime, Amer. Journ. Conch., V, p. 142. 



1876. Cyrena Bengalensis Sowerby, in Reeve Conch. Icon., XX, Cyrena pi. VII, fig. 23. 



1878. Cyrena bengalensis Kobelt, Illustr. Conchylienbuch, p. 341. 



1879. Cyrena bengalensis Clessin in Martini-Chemn., Conch. -Cab. (N. F.), IX, (3), Cycladeen, 



p. 107, pi. XIII, figs. I, 2, pi. XVII, figs. 4, 6. 

 1890. Cyrena Bengalensis and C. turgida Paetel, Cat. Conch. Samm., III, pp. 97, 99. 

 1915. Cyrena bengalensis Preston, Faun. Brit. Ind., Freshw. Moll., p. 205. 

 1921. Cyrena bengalensis Prashad, Rec. Ind. Mus., XXII, p. 38, pi. XX, figs. i, 2. 



As a resuit of a careful examination of the types of the Deshayesian species and the 

 collections in the British Muséum (Nat. Hist.), London, I am of opinion that in addition to 

 Gyrena turgida Lea included in the synonymy given above, Gyrena simiosa Deshayes ^) and 



i) Deshayes, G. P. — Proc. Zool. Soc. London (volume for 1854), p. 18 (1855). 



