TRANSACTIONS OF WAGNER 

 1376 



TERTIARY FAUNA OF FLORIDA 



Phacoides (Miltha) heracleus n. sp. 

 PLATE 51, FIGURE 10. 



Oligocene of the lower bed at Alum Bluff, and at Ballast Point, Tampa 

 Bay, Florida; Dall and Burns. 



Shell large, convex, subequilateral, rather thick, with small, pointed, proso- 

 gyrate beaks over an arcuately impressed, small, sublanceolate lunule ; anterior 

 dorsal area narrow and rather short, defined by a shallow sulcus ; posterior 

 area narrow elongate, divided by a second longitudinal sulcus into two parts, 

 of which the anterior is wider ; sculpture of fine concentric lines, feebler in the 

 middle of the disk, and of faint, nearly obsolete, sparser radial striations ; liga- 

 ment deeply inset, rather long; cardinals normal, rather small and slender. 

 Alt. 80, lat. 77, diam. 30 mm. 



This large species recalls the Pseudomiltha gigantea of the Parisian Eocene, 

 but the teeth are developed. Only one right valve and a fragment have so far 

 been obtained. 



Phacoides (Miltha) hillsboroensis Heilprin. 

 Lucina hillsboroensis Heilprin, Trans. Wagner Inst., i., pp. 117, 120, pi. xvi., fig. 62, 1886. 



Chipola beds at Alum Bluff and on the Chipola River, Calhoun County, 

 Florida, and at Ballast Point, Tampa Bay, in the silex beds ; Burns, Heilprin, 

 and Dall. 



This fine species is notable for its rather irregular concentric lamellation 

 with the interspaces finely concentrically striated. The teeth are well developed, 

 the lunule quite narrow and deep. The specimens from the marl are generally 

 deprived of the outer coat, thus removing all the lamellation, and exhibit a 

 faint radial striation which makes them hardly recognizable as the same species 

 as a complete specimen. The quite young shell is thin, convex, more transverse, 

 and has the aspect of a young Lucina. 



Phacoides (Miltha) caloosaensis Dall. 



PLATE 28, FIGURE i. 

 Lucina (Miltha) caloosaensis, Trans. Wagner Inst., iii., p. 923, pi. xxviii., fig. i, 1898. 



Pliocene of the Caloosahatchie and Shell Creek, Florida; Willcox, Dall, 

 and Burns. 



Shell elevated, rather compressed, short, finely concentrically striated ; beaks 

 small, pointed, slightly curved forward over an extremely minute and almost 

 obsolete lunule; anterior dorsal area short, narrow, feebly defined; posterior 

 area long, wider, defined by a narrow sulcus, with a less pronounced sulcation 



