174 



The generic name Cyrena Lam. as hitherto understood is an absolute synonym of corbiaila 

 Megerle, since C. cor was desig-nated as its génotype by Children ^) in 182 1. Stewart ") 

 following a suggestion of Baker argues that, as Schumacher suggested the resemblance of his 

 Cyclas laevigata to pi. CCCII, fig. 4 of "Encyclopéd. Méthod." — the figure on which Cyrena 

 zeylaiîica Lamarck was based — this may be accepted as the désignation of the génotype of 

 Cyclas^ in which case the generic name Cyclas Lam. would become available for the forms 

 hitherto known as Cyrena. I cannot agrée with this suggestion, and hâve, therefore, adopted 

 the next vahd name available, viz : — Geloina Gray '*) with G. coaxans (Gmelin) as its génotype. 



1. Geloina erosa (Solander). 



1741. Chama Liitraria et Coaxans Rumph, Amboin. Rarit., p. 138, pi. XLII, fig. H. 



1782. Venus ceylonica etc. Chemnitz, Conch.-Cab., VI, p. 333, pi. XXXII, fig. 336. 



1786. Venus erosa Solander, Portland Catalogue, pp. 71, 186. 



1788. Venus ceylonica Schroter, Conch.-Cab. Namen Reg., p. 42. 



1790. Venus coaxans Gmelin, Syst. Nat., (éd. XIII), p. 3278. 



1797. Bruguière, Encyclopéd. Méthod., pi. CCCII, figs. \a, b. 



1806. Cyclas ceylonica Lamarck, Ann. Mus. Paris, VII, p. 420. 



18 17. Venus coaxans Dillwyn, Descr. Cat., I, p. 177. 



1818. Cyrena zeylanica Lamarck, Anim. sans Vertèb., V, p. 554 bis. 

 18 18. Cyclas ceylanica Blain ville, Dict. Sci. Nat., XII, p. 279. 



1824. Cyrena zeylanica Dubois, Epitome, p. 66. 



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



1825. Cyclas zeylanica Blain ville, Man. Malacol., p. 552, pi. LXXIII, fig. 2. 



1825. Venus coaxans Wood, Ind. Test., p. 35, pi. VII, fig. 42. 



1828. Cyclas zeylanica Blainville, Dict. Sci. Nat., LVII, p. 336, pi. CIII, fig. 2. 



1830. Cyrena ceylanica Deshayes, Encyclopéd. Méthod., II, p. 49. 



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



1840. Cyrena zeylanica Pfeiffer, Krit. Reg., p. 63. 



1842. Cyrena Zeylanica Hanley, Rec. Biv. Shells, p. 93. 



1844. Cyrena Zeylanica Potiez & Michaud, Gai. Douai, II, p. 191. 



1845. Cyrena Zeylanica Catlow & Reeve, Conch. Nomencl., p. 31. 

 1847. Cyrena zeylanica Gray, Proc. Zool. Soc. London, p. 184. 



[849. Cyrena ceylonica Mousson, Land, Sùssw. Moll. Java, p. 89, pi. XIII. 



1850. Cyrena ceylonica Philippi, Abbild. Beschreib. Conch., III, p. 108, Cyrena, pi. III, fig. 3. 



1853. Cyrena zeylanica Gray, Ann. Mag. Nat. Hist., (2) XI, p. 39. 



1853. Cyrena zeylanica Philippi, Handbuch Conch. Malacol., p. 314. 



1854. Cyrena pallida and C. zeylanica Deshayes, Cat. Conch. Brit. Mus., II, Petricolidae, etc., 



pp. 247, 248. 



1855. Cyrena zeylanica Berge, Conchylienbuch, p. 52. 



1856. Venus coaxans Hanley, in Wood, Ind. Test., p. 46, pi. VII, fig. 42. 



1857. Venus coaxans Rômer, Krit. Unters., p. 71. 



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



1860. Cyrena Ceylanica and C pallida Reeve, Elem. Conch., II, p. 116. 



1862. Cyrena ceylanica Chenu, Man. Conchyliol., II, p. 103, fig. 462. 



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



1869. Cyrena ceylanica Frauenfeld, Verhandl. Zool. -Bot. Ges. Wien, XIX, p. 883. 



1870. Cyrena Ceylanica Prime, Amer. Journ. Conch., V, p. 143. 



1) Children, J. G. — Quart. Journ. Sci. Lit. Arts, XIV, p. 311 (1822). 



2) Stewart, R. B. — Spécial Publication Acad. Nat. Sci. Philadelphia, N" 3, p. 196 (1930). 



3) Gray, J. E. — Proc. Zool. Soc. London, p. 184 (1847). 



