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137s 



TERTIARY FAUNA OF FLORIDA ^ ' "^ 



Cyclas pandata Conrad, Am. Journ. Conch., i., p. 8, 1865. 

 Lucina {Miltha) compressa Cossmann, Notes CompL, p. 11, 1894. 



Eocene of Lisbon Bluff, of the Claiborne sands at Claiborne Bluff, and in 

 Jackson County, Alabama, and near Meridian, Mississippi. 



Lucina claytonia Harris, from the Chickasawan Eocene, is also a Miltha 

 belonging to group B. of the section. 



Phacoides (Miltha) ocalanus n. sp. 

 Plate 50, Figure 14. 



Oligocene of the Ocala horizon, Ocala, south Florida ; Willcox. 



Specimens found in the form of internal casts only ; valves elongated, with 

 low, subcentral beaks, the interior of the disk radially finely striated, anterior 

 and posterior adductor scars very long and narrow, rather oblique ; posterior 

 end of the shell almost rostrate. Alt. 33, Ion. 41, diam. 12 mm. 



This species is of the pandatus type, but that species has a rounded, not 

 elongate, posterior adductor scar, is not oblique, and is more compressed. No 

 species of Miltha has been listed from the Vicksburgian, of which the Ocala 

 beds form the upper culmination, and therefore I feel justified in applying a 

 name to these specimens. A cast of similar character but less well preserved 

 was collected from the Vicksburgian of Padlock, Florida, by the United States 

 Geological Survey. 



Phacoides (Miltha) chipolanus n. sp. 

 Plate 51, Figure ii. 



Oligocene of the Chipola River, Florida ; of the lower bed at Alum Bluff, 

 Chattahoochee River, Florida, and of Hawkinsville, Georgia ; Dall and Burns. 



Shell large, rather thin, compressed, with small, pointed, recurved beaks, 

 over a small, narrow, rather deeply impressed lunule ; there is no anterior dorsal 

 area ; the posterior area is long, narrow, and divided into two nearly equal 

 parts by an impressed line; sculpture of fine, slightly irregular concentric 

 raised threads, stronger distally, sublamellose on the dorsal area, fainter in 

 the middle of the disk, and rather close-set ; radial sculpture of faint, obscure, 

 slightly vermicular markings, hardly visible except in the middle of the disk ; 

 anterior adductor scar elongate ; posterior short, ovate ; cardinal teeth well 

 developed; ligament short, deeply inset. Alt. 75, Ion. 71, diam. about 11 mm. 



The figure of this species is restored from a number of fragments which 

 give practically all the characters except the hinge of the left valve. It is a 

 large, very compressed form belonging in group B. 



