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575 



TERTIARY FAUNA OF FLORIDA 



specific name had been used by Lamarck a year before it was applied by Say 

 to the fossil, so that for the American shell the name must be discarded. 



Nucula Shaleri Dall. 

 Plate 40, Figure 6. 

 Nucula S/ialeri Da.\\, Am. Journ. Sci., xlviii., p. 298, Oct., 1894. 



Miocene gravelly conglomerate of Chilmark, Martha's Vineyard, and 

 in the Pliocene of Gay Head ; J. B. Woodworth. 



This large species belongs to the group of M. decussata and antiquata 

 Sby., of which the recent representative on our coast is the small N. creniilata 

 Hinds. Lon. of shell 15, alt. 11, diam. 7 mm. There are eight to eleven 

 anterior and sixteen to twenty posterior teeth. 



Nucula chipolana n. s. 

 Plate 32, Figure 10. 



Oligocene ("Old Miocene") of the Chipola beds, Calhoun County, Florida, 

 and of the lower (Chipola) bed at Alum Bluff, Appalachicola River, Florida; 

 Burns and Dall. 



Shell small, solid, polished, with faint radial strise more conspicuous 

 ventrally, and more or less obvious incremental lines ; breaks turgid, low ; 

 posterior end of shell obliquely truncate, flatfish ; base arcuate, anterior dorsal 

 line sloping, anterior end attenuated and rounded; there is no defined lunule; 

 the escutcheon is elongate-cordate, ill-defined, the margins in the middle line 

 slightly pouting; internally polished, hardly pearly, with the basal margin 

 finely sharply crenulate; the chondrophore small, narrow, and very oblique, 

 anteriorly directed; anterior teeth narrow, slender, about thirteen, posterior 

 teeth four or five. Lon. of shell 4, alt. 2.75, diam. 20 mm. 



The chief characteristics of this small species are its elongated form and 

 fine radial striae. 



Nucula sinaria n. s. 

 Plate 32, Figure 7. 

 Oligocene of the Alum Blufif beds on the Yellow River at Oak Grove, 

 Santa Rosa County, Florida, and Miocene of the St. Mary's River, Maryland ; 

 Burns and Harris. 



Shell small, solid, trigonal, polished, with fine radial strias, more distinct 

 near the basal margins, and faint, concentric, rather irregular furrows, obsolete 



