TRANSACTIONS OF WAGNER 

 1474 



^ TERTIARY FAUNA OF FLORIDA 



Crassatellites (Scambula) undulatus Say. 



Crassatella undulata Say, Journ. Acad. Nat. Sci. Phila., iv., p. 142, pi. xii., fig. 2, 1824; 

 Conrad, Fos. Tert. Form., p. 23, pi. ix., fig. i, 1832 (not of Sowerby, P. Z. S., 1832). 



Miocene of Maryland, Say ; of Grove Wharf, James River, of York River, 

 City Point, and Petersburg, Virginia; of the Natural Well and Magnolia, 

 Duplin County, North Carolina; of Murfreesboro', Green County, and Edge- 

 combe County, North Carolina; and of Darlington Courthouse, South Caro- 

 lina. 



C. undulatus var. cyclopterus Dall. 

 Crassatella undulata var. Tuomey and Holmes, Pleioc. Fos. S. Car., pi. xx., fig. 8, 1856. 



Miocene Qf Maryland and South Carolina, of Grove Wharf, James River, 

 Virginia, and the Natural Well, Duplin County, North Carolina. 



This variety differs from the typical form of the species in its shorter and 

 higher form, more elevated beaks, more equilateral valves, and more pointed 

 and less truncate posterior end. The measurements of the two may be com- 

 pared. 



Lon. Alt. Diam. Ant. end. Truncation. 



Type 120 70 26 30 35mm. 



Variety no 80 30 38 18 mm. 



If it were not for the fact that intermediate forms occur, it would be diffi- 

 cult to believe that the two extremes could be included under the same specific 

 name. Conrad's Crassatella planata, described in 1866 from an internal cast 

 obtained from the Miocene of New Jersey, was very possibly the cast of such 

 a variety of Crassatellites melinns. 



Another New Jersey cast was named by Conrad in the same year Crassa- 

 tella peralta, but I have some doubt as to its being really Miocene. The only 

 Pacific coast species from the Miocene, if it has been correctly assigned, is 

 Crassatella collina Conrad, described in the Pacific Railway Reports (1857) 

 and subsequently figured by Gabb, who 'reports it both from the Miocene and 

 Pliocene of California. The recent C. gibbosa Sowerby has been reported by 

 Nelson from beds probably Pliocene on the Peruvian coast. 



Crassatellites (Scambula) Qibbesii Tuomey and Holmes. 



Crassatella Gibbesii Tuomey and Holmes, Pleioc. Fos. S. Car., p. 74, pi. xx., figs. 9, 10, 

 1856; Emmons, Geol. Rep. N. Car., p. 200, fig. 216, 1858; Harris, Bull. Am. Pal., i., 

 No. 3, p. 7, 1895. 



