TRANSACTIONS OF WAGNER 



TERTIARY FAUNA OF FLORIDA 



M. alabamensis O. Meyer, from the Claibornian, is, however, a well-character- 

 ized species. 



Modiolaria sp. indet. 



Oligocene of the Chipola River, Monroe County, Florida ; Dall. 



A single broken valve belonging to this genus was obtained from the 

 Chipola marl. It is a species similar to M. latcralis Say, but marked especially 

 by well-developed latticed sculpture in the interspaces of the radii. 



Modiolaria virginica Conrad. 

 Modiolaria virginica Conrad, Am. Journ. Conch., in., p. 267, pi. 22, fig. 3, 1867. 



Yorktown, Virginia, Conrad; from the Miocene beds along the York 

 River, Virginia, Harris. 



This small species is well-characterized by its rather angular shape, the 

 reticulated sculpture of the posterior area, and the feeble sculpture of the 

 anterior area. It recalls GregarieUa, and perhaps should rightly be referred 

 to that section of Modiolus rather than be placed in Modiolaria. 



Modiolaria carolinensis n. s. ? 

 PLATE 35, FIGURE 12. 



Upper Miocene of the Natural Well, Duplin County, North Carolina; 

 Burns. 



Shell small, plump, rather elongate, with a shallow but well-marked radial 

 furrow at the posterior edge of the medial smooth area; terminal areas 

 radiately sculptured with small, radial, rounded threads, those on the anterior 

 area fine and simple, those on the ridge of the posterior slope' more or less 

 reticulated by concentric elevated lines and distally dichotomous, divergent 

 from the summit of the ridge and stronger dorsally ; hinge-line straight, the 

 margin above it angulated at its posterior termination ; the beaks nearly 

 anterior, the posterior ventral termination of the valve rounded and produced ; 

 inner margin crenulated ; on the hinge-line the crenulse are almost like teeth, 

 and increase in strength backward distally being disproportionately large at 

 the end of the series. Alt. 4.5, lat. 6.5, diam. 3.5 mm. 



This shell is very like M. virginica, which, however, is arched instead of 

 angulated near the distal end of the hinge-line, and, in the specimens I have 

 been able to examine, is more rounded and less produced behind and has a 

 less conspicuous medial furrow. It may, however, prove, when a sufficiently 

 large number of specimens are brought together, that these characters fall 





