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TERTIARY FAUNA OF FLORIDA "'■^"' 



pallial line with a slight flexuosity behind, but no angular sinus ; hinge with one 

 strong and two feeble entire right cardinals and in the left valve two strong 

 cardinals ; dorsal margins grooved outside of the hinge-plate, as in Gemma, 

 but more feebly. 



Type Astarte triquetra Conrad. 



This genus has many of the features of Astarte superficially, but evidently 

 belongs to the Veneridce and is nearly related to Gemma, like which it is vivip- 

 arous. It has a long lineage in the Tertiary beds and is, so far as known, 

 exclusively American in distribution. 



Parastarte triquetra Conrad. 

 Astarte triquetra Conrad, Proc. Acad. Nat. Sci. Phila., iii., p. 24, pi. i., fig. 6, 1845. 

 Parastarte triquetra Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 288, 1862; Dall, 



Proc. U. S. Nat. Mus., vi., p. 339, 1883 ; Bull. U. S. Nat. Mus. No. 37, p. 48, pi. xlix., 



figs. 6, 7, 8, 1889. 

 Callicistronia triquetra Dall, Science, 1st Ser., ii., p. 447, Sept. 28, 1883 (olim). 



Micene of Jackson Bluff, Ocklockonnee River, Florida, Vaughan ; Pliocene 

 of south Florida in the marls of the Caloosahatchie, Shell Creek, Alligator 

 Creek, and the Myakka River ; Pleistocene of North Creek, near Osprey, 

 Florida, Dall ; living from Hillsboro' Inlet, East Florida, south to the Keys 

 and northward to Cedar Keys on the west side of the peninsula. 



This seems to be a characteristically Floridian type, being, so far as yet 

 known, confined to the peninsula, whether recent or fossil. 



Tryon seems to have supposed that the small shells included by Deshayes 

 under the name of Goodallia from the Parisian Eocene, and afterwards named 

 by Cossmann Microstagon, are generically identical with Parastarte, but this 

 is an error. The type of Goodallia is an Astarte somewhat modified, and does 

 not belong in the Veneridce. It will be more fully discussed under Astartidw. 



Genus PSEPHIDIA Dall, 1902. 

 Psephidia Dall, Journ. Conch. (Manchester), x.. No. 8, p. 243, 1902. 

 Psephis Carpenter, Suppl. R«p. Brit. Assoc, for 1863, p. 640, 1864; Proc. Acad. Nat. Sci. 



Phila. for 1865, p. 56, 1865. Type P. Lordi Cpr. ; not Psephis Guenee, 1854, Lepid. 

 Psephis Tryon, Syst. Conch., iii., p. 177, 1884; Fischer, Man. de Conchyl., p. 1084, 1887. 

 Venus (sp.) Gould, Journ. Boston Soc. N. Hist, vi., p. 406, 1853. 

 Trigona (sp.) Carpenter, P. Z. S., 1856, p. 201. 



Shell small, veneriform, polished, with only concentric sculpture if any; 

 beaks not prominent, valves inequilateral, with a narrow, feebly defined lunule 



