FREE INSTITUTE OF SCIENCE 



1441 



TERTIARY FAUNA OF FLORIDA ^ 



valve ; the cases where a less number is found are usually due to suppression, 

 and in the young they appear, if not in the adult. I have not been able to study 

 some of the fossil forms above enumerated and give their dental characters 

 v^rith all reserves. 



I am at a loss to understand Bernard's reference to Iphigenia, in which he 

 states that the dentition is identical with that of Cyrena.* From the specimens 

 I have seen I should consider the dentition of Iphigenia as characteristically 

 donacoid except in the suppression of the laterals, but I have not seen any 

 very minute examples of Iphigenia. 



Genus CYRENA Lamarck. 

 Cyclas (sp.) Bruguiere, Enc. Meth., i., pi. ccci., fig. 3, pi. cccii., fig. 4, 1798; Bosc, Hist. 



Nat. des Coq., iii., p. 36, 1802. 

 Cyclas B** Blainville, Diet. Sci. Nat., xxxii., p. 336, 1824; Man. de Mai., i., p. 551, 1825. 

 <;^Cyrena Lamarck, An. s. Vert., v., p. 551 bis, 1818; no type indicated, but the series 



divided into two groups, of which the Arst ^Corbicula Megerle, 181 1, and the other 



contains Astarte borealis Schumacher, Cyrena caroliniensis (^ caroliniana Bosc), 



C. bengalensis Lamarck, and C. zeylanica Lamarck (= C coaxans Gmel.) ; Deshayes 



ed. An. s. Vert., vi., p. 271, 183S ; Ferussac, Tableau Syst, p. xliii., 1821 ; Deshayes, 



Enc. Meth., Vers., ii., p. 46, 1830. 

 Cyrene ** Blainville, Diet. Sci. Nat., xxxii., p. 336, 1824; Man. de Mai., i., p. 552, 1825; 



C. seylanica Lam. 

 Cyrena {ex parte) Rang, Man. des Moll., p. 313, 1829. 

 Not Cyrena Schweigger, Handb. d. Naturg., p. 707, 1820 {^ C orbicula -\- Astarte sp.), 



nor T. Brown, Zool. Textb., i., p. 451, 1833 {z= Corbictila) , nor Sowerby, Conch. 



Man., ed. ii., p. 135, fig. 113, 1842 {^Corbicula). 

 := Cyrena Sowerby, Genera of Shells, fasc. v., 1822 ; C. sumatrensis Sby. ; Swainson, 



Malac, p. 370, fig. 119a, 1840. 

 Cyrena /3, Bowdich, Elem. Conch., ii., p. 9, 1822 ; Anton, Verz. Conch., p. 13, 1839. 

 Venulites (sp.) Schlotheim, Petref. Deutschl., p. 195, 1820. 

 Cyrena Gray, P. Z. S., 1847, p. 184, C. seylanica Lamarck; Philippi, Handb. d. Conch., 



p. 314, 1853 ; Gray, Ann. Mag. N. Hist., 2d Ser., xi., p. 39, 1853 ; Woodward, Man. 



Rec. Fos. Shells, p. 297, 1854; Deshayes, Cat. Conch. Brit. Mus., pp. 219, 241, 1854; 



Meek, Paleont. Upper Missouri, p. 157, 1876. 

 Geloina Gray, Synops. Brit. Mus., p. 75, 1844; Cyrena zeylanica Lam. 

 "^Geloina Morch, Journ. de Conehyl., ix., p. 348, 1861 ; for old-world species with minute 



pallial sinus, no type cited. 



* Bull. Soc. Geol. de France, 3me Ser., xxiii., p. 124, 1895. 



