DIAGNOSES OF i^TEW TERTIARY FOSSILS FROM THE 

 SOUTHERN UNITED STATES. 



By W. H. Dall, 



Honorary Curator of the Department of MoUusks. 



A LARGE number of interesting or new species have recently been 

 received by the Museum from the States bordering on the Gulf of 

 Mexico, partly from friends of the National Museum and partly from 

 the U. S. Geological Survey. Some of these are described in the fol- 

 lowing pages, but many more remain to be investigated. As it is 

 desirable that as full a list as i)racticable of species belonging to each 

 horizon shall be known, the following diagnoses are offered i^relimi- 

 nary to the illustrated report upon them, which is in preparation. 



Genus CAROLIA, Cantraine. 

 Subgenus WAKULLINA, Dall. 



Shell with the single chondrophore of Monia, the obsolescent byssal 

 notch and plug and simple adductor scar of Uj^Mppium. The sensible 

 but narrow cardinal area of Ephipplum is here represented by a broad 

 and conspicuous margin ; the lateral edges of the ligamentary scar in 

 the left valve form narrow, elevated crura, and the exterior is destitute 

 of the radiating sculpture common to all the other forms of the group, 

 and resembles that of the smooth Anomias. 



Type. — Carolia ( WakuUina) Jiofidana, Dall. 



CAROLIA (WAKULLINA) FLORIDANA, new species. 



Shell thiu, smooth, nacreous, adherent to other bodies, suborbicular, 

 more or less irregular 5 right valve flattened or concave, especially at 

 the umbo; left valve convex, with a moderately prominent umbo near 

 the cardinal margin; hinge margin variable, but always with a trans- 

 verse flattish area arched in the middle over the attachment of the 

 internal ligament; exterior irregularly imbricated by the scalj^ nacre- 

 ous layers; interior smooth, with a large subcentral, nearly orbicular 



Proceedings of the United States National Museum, Vol. XVIII— No. 1035. 



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