TRANSACTIONS OF WAGNER 

 1372 



TERTIARY FAUNA OF FLORIDA 



than ill the right valve ; hinge normal, the internal margins of the valve finely 

 crenulate. Alt. 15.5, Ion. 5.5 mm. 



This is the largest and most feebly sculptured of the east American Ter- 

 tiary species of this group. 



Phacoides (Lucinisca) cribrarius Say. 



Lucina cribraria Say, Journ. Acad. Nat. Sci. Phila., iv., p. 147, pi. xiii., fig. i, 1824 ; Con- 

 rad, Bull. Nat. Inst., ii., p. 187, 1842 ; Tuomey and Holmes, Pleioc. Fos. S. Car., p. 

 58, pi. xviii., figs. 8, 9, 1857; Emmons, Geol. N. Car., p. 293, fig. 218, 1858. 



Codakia cribraria Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 577, 1863. 



Miocene of St. Mary's, Maryland, Conrad and Finch; of Prince George 

 County, Yorktown and Petersburg, Virginia, Harris and Burns ; of Magnolia, 

 Duplin County, North Carolina ; Darlington, South Carolina ; of the upper 

 bed at Alum Bluff, Chattahoochee River, and of the Ocklockonnee River, 

 Florida. The typical locality is in St. Mary's County, Maryland. 



The newrer Miocene, as in North and South Carolina and Florida, contains 

 specimens nearly intermediate between the typical cribrarius and the muricatus 

 Spengler. 



The ,type form of this species has no produced ornamentation about the pos- 

 terior dorsal area, and the radial sculpture and marginal crenulation are 

 markedly coarser than in the recent species. 



Phacoides (Lucinisca) nassula Conrad. 

 Lucina nassula Conrad, Am. Journ. Sci., ii., p. 394, 1846; Proc. Acad. Nat. Sci. Phila., 



iii., p. 24, 1846; Dall, Bull. U. S. Geol. Survey No. 24, p. 149, 1885; Bush, Trans. 



Conn. Acad. Sci., vi., p. 478, 1885. 

 Lucina lintea Conrad, Am. Journ. Conch., ii., p. 281, pi. xv., fig. 7, 1866 ; Dall, Bull. U. S. 



Nat. Mus. No. 37, p. 52, 1889. 



Pleistocene of North Creek, near Osprey, West Florida, Dall ; recent from 

 near Cape Hatteras, North Carolina, south to Cuba and west to Mobile Bay. 



Phacoides nassula variety caloosana Dall. 



Pliocene of the Caloosahatchie beds in south Florida, on the Caloosahatchie 

 and Shell Creek ; Dall and Burns. 



This form differs from the Pleistocene and recent shell by being shorter, 

 higher, and longer when fully grown, in having the concentric sculpture sharper 

 and more prominent above the radials ; the lunule averages larger and the den- 



