FOSSIL SQUALIDiE OF THE UNITED STATES. 197 



Agassiz mentions them from the Crag {Miocene) of England. I have not met with 

 them in the Miocene of the United States. 



2. L. CUSPID AT A, Agassiz. Figs. 103 to 106. — This species is described by 

 Agassiz as common in the Swiss molasse, {Miocene.) I have it from the Eocene of 

 Washington, Georgia, from Rev. George White, of Savannah, and from the mouth of 

 Potomac Creek, Virginia, presented me by J. G. Bruflf, Esq. It is very like 

 L. elegans, is in general very thick, of moderate breadth, equilateral, straight, or a 

 little curved back. The edges are smooth and cutting the whole length ; external 

 face perceptibly elevated; inner. more so. The base of the enamel, which is smooth, 

 is usually sloped at a right angle on the outer face, which is not as well marked on 

 the inner. The peculiar distinction from L. elegans is that it is smooth on both 

 faces, having no strise. The root is more largely developed than in other species, 

 and cases occur where the branches exceed in leno^th the heio:ht of the cone. 



Agassiz now refers L. denticulata to this species. 



3. L. coMFRESSA, Agassiz. Figs. 107 to 112. — These resemble much in general 

 appearance the small teeth of Otodus ohliquus. They are more flat and less broad, 

 the root is less prominent, and the passage to the crown less marked. They are 

 more lanciform, and the cone more slender than in Otodus. The denticles are 

 irregular, generally larger in the posterior teeth. 



All my specimens are from the Santee Canal, {Eocene,) South Carolina. Agassiz 

 described this from imperfect specimens, as Oxyrhina leptodon, which he now 

 withdraws. 



4. L. ACUMINATA, Agassiz. Figs. 113, 114, 115. — This species is- of medium size, 

 very thick at the base, edges cutting, nearly equal, outer surface flat, curved 

 outwardly near the apex ; inner face prominent ; lateral denticles well developed ; root 

 thick. 



I have met with only three specimens, all from the Eocene of Orangeburg, South 

 Carolina. 



5. L. CRASSIDENS, Agassiz. Figs. 116, 117, US. — The name of this species 

 indicates its form, which is short and thick. The outer face is flat, the inner 

 prominent and curved backward, the root very thick, and prominent inwardly; 

 edges cutting. 



Found in the Eocene of South Carolina. 



6. L. {Odontaspis) contortidens, Agassiz. Fig. 119. — Agassiz describes this as 

 of a subulate irregular form, much curved inwardly, its internal face having distinct 

 folds from the base to the summit ; the root well developed and thick, the branches 



