TRANSACTIONS OF WAGNER 

 MO6 



TERTIARY FAUNA OF FLORIDA 



ribs and pass over them as fine concentric threads ; internal margin "fluted, 

 hinge strong, with a small, smooth space on each side of the umbones simu- 

 lating lunule and escutcheon. Alt. 11.5, Ion. 8, diam. 7 mm. 



This is the only species which when perfectly intact is without nodules. 



, Cardium (Trigoniocardia) Willcoxi n. sp. 



PLATE 48, FIGURE 9. 



Pliocene marls of the Caloosahatchie and Shell Creeks, Florida; Willcox 

 and Dall. 



Shell small, plump, oblique, ovate triangular, obtusely carinate behind, with 

 high involute, prosogyrate beaks ; body with nine, truncation with eight ribs ; on 

 the body the ribs are high, flat-topped, with channelled, cross-striated interspaces 

 narrower than the ribs ; on the truncation the ribs are smaller and lower ; 

 when intact the ribs carry a row of nodules (rounded in the young, more or 

 less transverse in the adult) which do not extend quite to the sides of the top 

 of the rib on which they are seated; on the truncation the nodules appear to 

 remain hemispherical- at all ages; the cross-striation of the channels is close 

 and very elegant ; there is a small, smooth space in front of the most anterior 

 rib; the inner margins are fluted and the hinge strong, but more transverse 

 than in many of the species. Alt. 11, Ion. 8, diam. 9 mm. 



This elegant little shell is very abundant in the Caloosahatchie marl. It 

 most resembles C. Simrothi Dall, and the Pacific coast recent C. alabastrum 

 Carpenter, but is more elongate, more pointed below, and has no backward 

 wing to the hinge-margin. The large ribs are proportionately smaller and 

 less elevated than in C. alabastrum. 



Subgenus PAPYRIDEA Swainson. 

 Cardium (Papyridea) spinosuxn Meuschen. 



fCardium rugatum Gronovius, Zoophyl., p. 278, pi. 18, fig. 5, 1781. 



Cardia spinosum Meuschen, Mus. Gevers., p. 442, No. 1637, 1787 (after Lister, pi. 342, 



fig. 179, Jamaica, and Knorr, vi., pi. 7, fig. 6). 



f Cardia hiatus Meuschen, op. cit., p. 442 (after Gualtieri, pi. 85, fig. H). 

 Solen bullatus Chemnitz, Conch. Cab., vi., p. 65, pi. 6, figs. 49, So, 1782; not of Linne, 



Syst. Nat., ed. x., p. 673, 1758 (= Area sp., Rumphius, pi. 44, fig- N > Amboyna). 

 Cardium bullatum of Authors, as of Linne, not of Morch, 1853. 

 Cardium soleniforme Bruguiere, Enc. Meth., Vers., i., p. 235, 1789; Wood, Gen. Conch., 



p. 233, pi. 56, fig. 3, 1815. 

 fCardium latum Born, Index Mus. Vind., p. 67, 1778; Test. Mus. Vind., p. 48, pi. i".. 



