655 



Oathoc. 



Orthoceras ortoni, Meek, Proc. Acad. N. S. Phila., 1872, 



Pal. Ohio, Vol. 1, 1873, 

 page 155, plate 13, fig. 8, a 

 side view of an imperfect 

 specimen, somewhat flat- 

 tened by accidental pres- 

 sure, in M\ Dyer's collec- 

 tion. Cincinnati group, 

 Illh. 



Orthoceras pelops, Hall. Pal. N. Y. Vol. V ii, 1879, page 



233, plate 78 B^ fig. 2, a portion of Hall's complete figure, show- 

 ing only the inhabited chamber, and the three narrow chambers 

 behind it, eight others to the smaller end being cut off; also the 

 open end of the large chamber cut ofi*. The scratches (striae) 

 on one part of the surface are bent to a middle line, not because 

 this is their natural mode of appearance, but the animal thus 

 repaired some violent fracture of its shell, which was thereby 

 thickened and preserved, while all the rest of the shell has 

 been dissolved, leaving only a cast. (Hall; who gives eleven 

 other figures of this species on plates 35, 35 A^ and 37.) Found 

 at Knox, N. Y. in Upper Relderherg strata, VIII a. — See 

 0, ohioe7ise^ above. 



