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1431 



TERTIARY FAUNA OF FLORIDA 



Venericardia (Cyclocardia) granulata Say. 



Venericardia granulata Say, Journ. Acad. Nat. Sci. Phila., iv., p. 142, pi. xii., fig. I, 1824. 



Cardita granulata Conrad, Fos. Medial Tert., p. 12, pi. vii., fig; i, 1838; Proc. Nat. Inst., 

 Bull, ii., p. 187, 1842; Am. Journ. Sci., 2d Ser., i., p. 404, 1846; Tuomey and Holmes, 

 Pleioc. Fos. S. Car., p. 66, pi. xix., figs. 6-7, 1858; Whitfield, Mio. Moll. N. Jer., p. 

 56, pi. ix., figs. 1-4, 1894. 



Actinoholus granulata Conrad, Proc. Acad. Nat. Sci Phila. for 1862, p. 578, 1863. 



Cardita tridetitata Emmons, Gaol. Rep. N. Car., p. 302, fig. 236A, 1858; not of Say. 



Venericardia (^Cardiocardites) granulata Meek, Check!. Mio. Fos. N. Am., p. 7, 1864. 



Miocene of Atlantic City, New Jersey ; of Plum Point, Maryland ; of 

 Petersburg, York River, Coggins Point and City Point, James River, Vir- 

 ginia; Wilmington, Murfreesboro', Magnolia, and the Natural Well, Duplin 

 County, North Carolina ; of the Ashley River beds, South Carolina ; of Alum 

 Bluff and Jackson Bluff, Florida ; Pliocene of Sumter and the Waccamaw 

 River, South Carolina. 



This well-known and abundant Miocene species has been by Verrill and 

 others united with V. borealis Conrad, a recent shell. It is certainly quite simi- 

 lar to, and doubtless the precursor of, V. borealis, but the careful study of a 

 large series of both species leads me to believe that they are sufficiently dis- 

 tinct. V. granulata is constantly smaller, more ventricose, and less oblique, 

 with fewer ribs, though the number varies in borealis from fifteen to twenty- 

 one. In both species the ribs near the beak tend to be granulose or beaded. 



Venericardia (Cyclocardia) californica n. sp. 

 Plate 56, Figure 16. 



Pliocene (?) of California, five miles southwest of Guadalupe; G. H. Eld- 

 ridge. 



Shell of moderate size, rounded-trigonal, somewhat inequilateral ; beaks 

 small, prosogyrate, dorsal slopes steep, the anterior shorter, base arcuate ; 

 sculpture of fourteen to sixteen radial, more or less beaded or nodulous stout 

 ribs, those on the posterior slope smaller, smoother, and less distant; inter- 

 spaces channelled, subequal to the ribs ; the whole with transverse concentric, 

 somewhat irregular elevated lines. All the sculpture more feeble towards the 

 base ; lunule small, lanceolate, smooth ; hinge normal, interior basal margin 

 with a few coarse crenulations. Length 24.0, height 21.5, diameter 14.0 mm. 



This coarsely ribbed subtrigonal species is clearly distinct from any other 

 of our species, recent or fossil. 



Other fossil species of this group are V. (C.) castrana Glenn, from the 



