369 



Machje. 



Machaeracanthus major, New. Pal. Ohio, Vol. 1, pi. 25, f. 2. 

 VIII, ^. 



R.595 



Machaeracanthus peracutus. See Appendix. 



Madurea lahiata. See Raphistoma labiatum, Ilh. 



Maclurea magna, LeSueur. J. 

 Nat. Sc. Acad. Phil., Vol. 1, 1818. 

 Rogers, page 817, fig. 595. Em- 

 mons, page 276, fig. 73, 1. Chazy 

 formation, II h. It is one of the 

 few large gasteropod shells found in 

 the 6000 feet of limestone strata, of 

 Blair Co., Pa., and only in the up- 

 per half of the mass, i. e. in the 

 Chazy subdivision,) 0. E. Hall in T 

 3, p 367.) The same is true in Hun- 

 tingdon and Centre Cos. (Ewing in 



T4, p. 423.) 

 Note. Most 

 commonly 

 nothing 

 ^' more than a 

 white spiral 

 line can be 

 seen on the 

 rock speci- 

 men ; this 

 line repre- 

 senting the 

 edge of the 

 shell-whorl 



converted 

 into crystal- 

 line carbon- 

 ate of lime, 

 24 



