TRANSACTIONS OF WAGNER 

 1382 



TERTIARY FAUNA OF FLORIDA 



Phacoides (Parvilucina) yaquensis Gabb. 

 Lucina yaquensis Gabb, Geol. of St. Domingo, p. 251, 1873. 



Oligocene of St. Domingo and of the marl at Bowden, Jamaica; Hender- 

 son and Simpson. 



This species differs from the Chipolan form, P. sphceriolus, in being much 

 more delicate, rather smaller, with almost obsolete radial sculpture, much 

 smaller lunule, and stronger, more rounded, and close-set concentric sculpture; 

 the largest valve is about four millimetres in length. 



Phacoides (Parvilucina) sphaeriolus n. sp. 

 PLATE 52, FIGURE 15. 



Chipola Oligocene of the Chipola River and of the lower bed at Alum Bluff, 

 Chattahoochee River, Calhoun County, Florida; Dall and Burns. 



Shell small, plump, rounded, subequilateral, with small, somewhat proso- 

 gyrate beaks ; lunule small, lanceolate, moderately excavated ; escutcheon 

 linear or none ; dorsal areas indicated by the absence of radial sculpture, hardly 

 impressed ; disk with twenty- four or more rounded radial riblets, of variable 

 strength, but not bifurcate, crossed by rather sparse, thin, little elevated lamellae 

 which are higher on the dorsal areas ; hinge normal, strong ; inner margins 

 strongly crenulate. Alt. 4.0, Ion. 4.2, diam. 2.75 mm. 



A larger and more solid shell with stronger radials, larger lunule, and less 

 close and regular concentric sculpture than in P. yaquensis. 



Phacoides (Parvilucina) piluliformis n. sp. 

 PLATE 52, FIGURE 6. 



Upper Oligocene of Walton County, De Land, and Oak Grove, Santa Rosa 

 County, Florida ; Miocene of the artesian well at Galveston, Texas, at a depth 

 of 2552 to 2600 feet below the surface ( ?). 



Shell small, plump, rounded, with small inconspicuous beaks ; lunule lan- 

 ceolate, small, impressed and clearly delimited ; escutcheon narrow, depressed, 

 elongated, bordered by a sharply angular keel ; dorsal areas large, distinctly 

 impressed, sinuating the margin ; radial sculpture faint or obsolete ; concentric 

 sculpture irregular, like strong incremental lines, tending to become lamellose 

 over the dorsal areas; hinge strong, marginal crenulation rather fine. Alt. 

 4.0, Ion. 4.5, diam. 4.0 mm. 



A convex little shell with almost exactly the sculpture of the recent P. 

 tenuisculptus Cpr. 



