TO GEOLOGY. 203 



Monoptygma elegans. Plate 6. Fig. 217. 



Description. Shell ovately elliptical, transversely and 

 closely furrowed ; furrows closely set with punctures ; 

 substance of the shell thin ; spire ; columella furnish- 

 ed with rather a small oblique fold; mouth elliptical, 

 effuse at base ; outer lip sharp. 

 Length .... Breadth 3-20ths, of an inch. 



Observations. This very interesting shell, in its general 

 form, does not very closely resemble the M. Jllabamiensis* 

 (nobis) ; the single fold on the columella alone, would 

 cause them to be recognized as the same genus. In the 

 elegans the numerous punctured striae resemble closely the 

 Jlcteon punctatus-\ (nobis). Having but a single specimen, 

 the superior whorls of which are deficient, the description 

 has to be necessarily defective. 



The Eocene of Claiborne, like the London Clay of 

 England, has presented remains of other classes than the 

 Conchifera and Mollusca. In the sand was found a part of 

 the pincer of a Cancer two small vertebrae, probably of a 

 fish a stony substance resembling a section of what 

 Brander figures under the name of Palatium Piscium\ a 

 stony substance, somewhat resembling in form the elliptical 

 bone, found in the head of fish teeth of sharks of several 

 different species the spine of a fish, and a curious tooth 



* See page 186. t See page 11 1 



t Fossilia Hantoniensia, pi. 9, fig. 117. 



