TRANSACTIONS OF WAGNER 

 1 1 68 



TERTIARY FAUNA OF FLORIDA 



Genus TTJRTONIA Alder. 

 Turtonia Alder, Cat. Moll. North, and Durham, p. 95, 1848; Forbes and Hanley, Brit. 



Moll., ii., p. 80, 1853; Verrill, Am. Jonrn. Sci., 3d Ser., Hi., p. 286, pi. 7, fig. 4, 1872; 



Rep. U. S. Fish Com. for 1871-72, p. 687, 1873. Type Venus minuta Fabr., Fauna 



Gronl., p. 412, 1780. 

 Cyamium Jeffreys, Adams, and others ; not of Philippi, 1845. 



Shell ovate, smooth, closed, with an elongated external combined resilium 

 and ligament; margins entire; hinge with, in the right valve, two stout car- 

 dinals, prolonged into slightly prominent laminae anteriorly, in the left valve 

 one stout and one slender arched laminar cardinal and an obscure lateral lamina 

 entering a sulcus in the opposite valve ; pallial line distinct, not sinuate, adduc- 

 tor scars ovate, distinct, surmounted by a smaller pedal scar from the retractors. 



This genus is entirely distinct from Philippi's Cyamium, with which it has 

 frequently been confounded. It has no internal ligament and the teeth are of 

 a different character. The hinge is well figured by Verrill (loc. cit., fig. 4, 

 1872), but the very large pedal scar indicated in his figure must have been 

 abnormal, as I have not found it of any such size in a large number of speci- 

 mens examined. 



Cyamium Philippi (Arch, fur Naturg., 1845, P- 5) is based upon a small 

 translucent shell having somewhat the appearance of Abra. It has a strong 

 internal resilium ; an amphidetic, obsolete, external ligament ; two strongly 

 bifid cardinals in the right valve, and in the left three smaller simple cardinals. 

 The pallial line is obscure but apparently simple, and the teeth recall those of 

 Cooperella rather than of the Leptonacea. 



Turtonia minuta Fabricius. 



Venus minuta Fabricius, Fauna Gronl., p. 412, 1780. 

 Mya purpurea Montagu, Test. Brit. Suppl., p. 21, 1808 ; not of Turton, Dithyra Brit, p. 54, 



1822. 

 Turtonia minuta Alder, Cat. Moll. North, and Durham, p. 95, 1848; Stm., Sh. of N. Engl., 



p. 16, 1851; Verrill, Rep. U. S. Fish Com. for 1871-72, p. 687, 1873; Dall, Bull. 37, 



U. S. Nat. Mus., p. 48, pi. 64, fig. 1420, pi. 68, fig. 7. 



Turtonia nitida- Verrill, Am. Journ. Sci., 3d Ser., iii., p. 286, pi. 7, figs. 4, 40, 1872. 

 Cyamium minutum Jeffreys, Brit. Conch., ii., p. 260, pi. S, fig. 8, 1863, v., pi. 33, figs. 5, 50, 



1869. 



Pleistocene of raised beaches near Portland, Maine, Fuller ; recent, Cape 

 Cod to Greenland, " South Carolina," Kurtz ( ?) ; Atlantic and Mediterranean 

 coasts of Europe, and the shores of southern Alaska and the Aleutian Islands 

 from Nunivak Island south to Sitka, Dall. 



