﻿AMERICAN TERTIARY AND CRETACEOUS FOSSILS. 397 



Dimensions. — Length -23 in., width -3 in., depth of valve *1 in. 

 Locality. — Ripley Group, with Gorbula crassiplica and Astarte crenulirata on the 

 Mississippi and Tennessee State line. Prof. Safford. 



N. Eufalensis. PI. 68, fig. 35. Equilateral ; beaks small ; surface marked by 

 numerous, concentric lines. 



Dimensions. — Length -35 in., width -55 in., height of valve -1 in. 

 Locality. — Common in the Ripley Group at Eufala, Ala. My collection. 



LED A, Schum. 



L. peotexta. PI. 68, fig. 35. 



L. protexta, Gabb, Jour. Acad. Nat. Sci., 2d series, Vol. 4, p. 303, pi. 48, fig. 23. 

 (24 in text per errorem.) 



This species was originally described from a cast from New Jersey. Through the 

 kindness of Prof. Safford I am now enabled to describe it more fully. 



Spec. Char. — Very wide transversely ; beaks small, incurved ; posterior end acu- 

 minate, curved slightly upwards ; anterior and basal margins regularly rounded ; 

 surface marked by numerous, transverse ribs. 



Dimensions of the most 'perfect specimen. — Length *5 in., width "25 in., diameter 

 ■2 in. 



Locality. — Hardeman Co., Tenn. Ripley Group. 



One specimen in the lot, received from Prof. S., is as large as the cast originally 

 described, but it is broken. 



L. Slackiana. PI. 68, fig. 36. Inequilateral, (casts) ; muscular scars large and 

 deep ; margin crenate ; cardinal line apparently curved, basal irregularly rounded ; 

 hinge teeth apparently large, cup very distinct, pallial line very distinct. 



Dimensions. — Length about *6 in., width about *8 in. 



Locality. — Dark marl, Crosswicks, N. J. My collection. 



This is one of the finest casts I have ever seen from New Jersey. I take pleasure 

 in dedicating it to my friend, Dr. J. H. Slack, to whom I am indebted for this and 

 several other new species. 



ARC A, Linn. 



A. Saffordii. PI. 68, fig. 37. Gibbous, nearly equilateral ; beaks small, over- 

 hanging the area ; umbones broad ; area narrow and transversely striate ; anterior 

 margin narrower and straighter than the posterior, which is regularly curved ; surface 

 marked by obscure radiating and concentric lines ; hinge rather broad, curved ; teeth 

 large. 



Dimensions. — Length *2 in., width '26 in., height of valve "1 in. 



Locality. — Hardeman Co., Tenn. Prof. Safford. Also found in the Ripley Group 



of New Jersey. 



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