FREE INSTITUTE OF SCIENCE 



TERTIARY FAUNA OF FLORIDA "'"'^ 



Cyrenoides Sowerby, Conch. Man., 2d ed., p. 135, fig. 114, 1842; Woodward, Man. Rec. 



and Fos. Sh., p. 298, pi. xix., fig. 19, 1855 ; Tryon, Struct, and Syst. Conch., iii., p. 187, 



1884. 

 Cyrenoidea Hanley, 111. Cat. Rec. Biv. Shells, Expl. Suppl. pi., p. 10, 1846; Dall, Nautilus, 



X., p. 51, 1896. 

 Cyrcnodonta H. and A. Adams. Gen. Rec. Moll., ii., p. 453, 1857; not of Joannis, Mag. de 



Zool., expl. pi. Ixx., Feb., 1836 (nomen nudum). 

 Cyrcnoida Hanley, 111. Cat. Rec. Biv. Shells, App., p. 352, 1846 ; Philippi, Handb. der 



Conch., p. 316, 1853; Gray, Fig. Moll. An., v., p. 18, pi. cccxlvii., figs. 1-3, 1857; H. 



and A. Adams, Gen. Rec. Moll., ii., p. 452, pi. cxi., figs. 5, 5a, sb, 1857. 



The name of this genus as applied in the first paper of Joannis has been 

 regarded by many authors as malformed or due to a typographical error, but 

 Philippi claims it to be correctly compounded of two Greek words, and, as it 

 has been accepted by several eminent writers, it will be best to retain it as 

 originally written, though the insertion of the penultimate e would make it 

 more euphonious. It has nearly nine months' precedence in print of Cyrenella 

 Deshayes. The name of the type, dedicated to Madame Dupont, should be 

 Dupontc€ or Dupontia, and not Dupontii or Dupontia, as spelled by Joannis 

 and others. 



Cyrenoida caloosaensis Dall. 



Plate 51, Figure 5. 

 Cyrenoidea caloosaensis Dall, The Nautilus, x., p. 52, Sept., 1896. 



Pliocene marls of the Caloosahatchie River, south Florida; Dall and Will- 

 cox. 



This is the largest species of the genus and has the best developed hinge 

 of any. 



The other two American species are only known in a recent state, C. Uori- 

 dana Dall, on the Georgia and Florida coast, and C. aniericana Morelet, 1851, 

 described from Porto Rico. The typical species occurs in the estuaries of west 

 African rivers, and was received first from Senegal and later from Liberia. 

 All are very similar, and discriminated only by minor differences in the hinge 

 and general form and color. 



Family THYASIRID^. 

 Genus THYASIRA (Leach) Lamarck. 

 Thyasira (Leach MS.) Lamarck, An. s. Vert., v., p. 492 (in synonymy), 1818; Tellina 

 ■Rexuosa Montagu, sole example. Leach, Moll. Gt. Brit., p. 311, 1852; Stimpson, Shells 

 of N. Engl. 



