TRANSACTIONS OF WAGNER 



QO2 



TERTIARY FAUNA OF FLORIDA 



Mulinia Milesii Holmes. 



Mulinia Milesii Holmes, P.-P1. Fos. S. Car., p. 42, pi. vii., fig. u, 1859. 

 Mulinia parilis Conr., Am. Journ. Conch., iii., p. 269, pi. 22, fig. 5, 1868; not Mactra 



parilis Conrad. 



Mitliniii caivliniana Conr., MS. label Coll. Acad. Nat. Sci. 

 Mactra contracta Conr., Am. Journ. Conch., iii., p. 268, pi. 22, fig. 6, 1868. 



Uppermost Chesapeake Miocene of Virginia, North and South Carolina, 

 and Florida; Holmes, Johnson, Burns, ct al. 



This form is probably an extremely elongate variety of coiigcsta, of which 

 parilis is the young. The reference of the type of contracta to Mactra by 

 Conrad was an error due to the breaking away of the thin roof of the 

 cartilage-pit and subsequent wear on the broken edges. 



Mulinia caloosaensis n. s. 

 PLATE 28, FIGURES 4, 6. 



Pliocene of the Caloosahatchie beds on the Caloosahatchie and Shell 

 Creek, Florida ; Ball and Willcox. 



Shell small, solid, thick, elongate ovate, subcquilateral, sculptured chiefly 

 by concentric lines of growth ; form somewhat variable, but in general with 

 the anterior side shorter, rounded, the posterior longer, narrower, the dorsal 

 slope descending more rapidly than in front, and terminating in a more or less 

 distinct, somewhat oblique truncation, with its basal angle almost pointed ; 

 dorsal areas polished, with obscure boundaries ; beaks small, pointed, distant, 

 with a keel or angular line extended from the umbo to the posterior basal 

 angle of the shell; interior smooth; pallia! sinus small, pointed in front; 

 hinge normal, solid, strong, the laterals short, finely granular, not cross- 

 striated; the chondrophore completely roofed in, but frequently showing a 

 fissure above due to erosion. Lon. 22, alt. 15, diam. 12 mm. 



Larger specimens than the one above described arc not uncommon ; 

 the most characteristic features are the broad area set off by the posterior 

 keels, and the somewhat quadrate general form. 



Mulinia sapotilla n. s. 

 PLATE 28, FIGURES 7, 8, 9, 14. 



Pliocene of the Caloosahatchie beds ; Dall and Willcox. 

 Shell small, solid, compressed, very inequilateral, varying in form like 

 the rest of the genus, but in general with the beaks at the anterior third of 



