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859 



TERTIARY FAUNA OF FLORIDA 



Genus ORYPTOMYA Conrad. 

 SphcDiia Conrad, Journ. Acad. Nat. Sci. Phila., vii., p. 234, 1837. 

 Cryptomya Conrad, Proc. Acad. Nat. Sci. Phila., iv., p. 121, 1S48. 



Shell like a small Mya, but the pallial sinus absent or obsolete. Type : 



Cryptomya californica Conrad. 

 SphcBiiia californica Conrad, Journ. Acad. Nat. Sci. Phila., vii., p. 234, pi. 17, fig. 11, 



1837- 

 Cryptomya californica Conrad, Proc. Acad. Nat. Sci. Phila., iv., p. 121, 1S48 ; viii., p. 



314, 1857. 

 Cryptomya ovalis Conrad, Pac. R. R. Reps., vi., p. 69, pi. 2, fig. 2, 1856. 



Miocene of California in many localities, also Pliocene and Pleistocene, 

 and recent from British Columbia to Lower California. 



Geuus SPHBNIA Turton. 

 Sphenia Turton, Dithyr. Brit., p. 37, 1822. Type S. Bing-kami Tuxtou. 

 Sphcenia Conrad, 1837; Sphcena Defrance, Tabl., p. 105, 1824; Sphena Deshayes, Enc. 

 Meth., iii., p. 965, 1832 ; and Sphcenia Gabb, Pal. Cal., ii., p. 90, 1869. 



Shell small, irregular, nestling, with an irregular pallial line and deep 

 sinus, short siphons, and the chondrophore narrow and very oblique. 



Most of the diagnoses of Sphenia are faulty ; there are no teeth, the 

 chondrophore is very narrow and oblique, borne by the smaller left valve as 

 in Mya, from which the genus is barely separate. 



The only species recorded in our Tertiary are Sphenia californica Conrad, 

 which is the type of Cryptomya, and 5. bilirala Gabb (Proc. Acad. Nat. Sci. 

 Phila., xiii., p. 369, 1862), from the Tertiary of Santa Barbara, California, 

 which seems to have been omitted from Gabb's Paleontology of California. 

 5. ornatissima and alternata Orb., reported by Gabb from the Tertiary of 

 St. Domingo, are species of Cnspidaria. 



Sphenia dubia H. C. Lea. 

 Panopea dubia H. C. Lea, Trans. Am. Phil. Soc, ix., p. 236, pi. 34, fig. 9, 1845 (extra 

 copies p. 10). 



Miocene of Petersburg, Virginia, Lea ; of York River, Virginia, Harris ; 

 of North Carolina, at Magnolia and the Natural Well, Duplin County, Burns. 



This is a small, irregular little shell which is found sparsely at the locali- 

 ties indicated. 



