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TERTIARY FAUNA OF FLORIDA fyo 



Smaller, more equilateral, and with more erect beaks than undulata and 

 somewhat more compressed. 



Astarte (distans var. ?) floridana Dall. 

 PLATE 57, FIGURE 19. 



Chesapeake Miocene horizon at Alum Bluff and Bailey, Calhoun County, 

 Florida ; Burns and Vaughan. 



Shell subtriangular with acute, slightly prosogyrate beaks, compressed, sub- 

 rostrate, with a few wide ripples near the umbones, the ventral half of the 

 disk, or more, smooth ; lunule and escutcheon narrow, elongate, smooth, the 

 former deeply excavated. Height 23, length 25, diameter 9 mm. 



This shell recalls undulata, but has not the high, gibbous beaks and is a 

 smaller and flatter species ; it differs from distans by its thick and heavy hinge, 

 like that of undulata, its thicker shell, and more rostrate valves. 



Astarte (Ashtarotha) parma n. sp. 

 PLATE 57, FIGURE 22. 



Older Miocene of Skipton, Maryland, and the Isocardia bed at Plum Point ; 

 Harris and Burns. 



Shell very flatly compressed, inequilateral, rostrate, the beaks at the anterior 

 third low, acutely pointed, slightly recurved ; lunule narrow, deeper than wide ; 

 escutcheon narrow, deep, as long as the posterior slope, which is almost 

 straight ; sculpture of the beaks with about five small, fine ribs, close together, 

 followed by three or four very distant, much wider ripples, obsolete towards 

 the ends and ventral margin, with a few irregularly spaced linear concentric 

 sulci beyond; posterior dorsal profile slightly arcuate, basal margin slightly 

 emarginate behind; anterior end rounded, posterior end pointed; inner ven- 

 tral margins crenate ; hinge-plate broad and flat with two long, narrow car- 

 dinals in each valve. Height 25.0, length 28.5, diameter 7.0 mm. 



This curious form differs from perplana by its more compressed, flatter, and 

 more acutely pointed valves, and by its umbonal sculpture. 



Astarte (Ashtarotha) perplana Conrad. 



starte perplana Conrad, Fos. Medial Tert, p. 43, pi- xxi., fig. 3, 1840; Proc. Acad. Nat. 

 Sci. Phila., xiv., p. 578, 1863; Meek, Checkl. Inv. Fos. Miocene, p. 7, 1864; not A. 

 perplana Conrad, 1841. 



Miocene of Maryland at St. Mary's, Windmill Point, and Blake's Cliffs, 

 Calvert County. 



Smoother, more convex, and thicker than the preceding species. 



