258 



Fig. 175. Pnheoneilo fecundn. Right and left valves of different individuals of the 

 usual form (from Hall). 



Found in tlit lower Moscow shale, at Sections 4 and o 

 (rare); and in the Lower shale, down to twentv-one feet 

 below the Encrinal limestone, at Sections 5 to 7. 



PAL.q^oxEiLo'; MUTA. Hall. (Fig. 176.) (Pal. N. Y., Vol. 

 v., Pt. I., p. 387, PI. LXIX.) 



Distinguishing Characters.— L\ke the preceding in outline 

 and pro])ortions, hut entire surface marked by strong, regu- 



FiG. 176. Pnlcponeilo mufa. Two left valves and one right valve of different sizes 

 (from Hall). 



lar, lamellose, elevated sti-ia', with very fine intermediate 

 stria?. 



Found ill the lowest two feet of the Moscow shale, at Sec- 

 tions 4 and 5 ; and in the shales down to and in the Stropha- 

 losia bed (very rare and at great intervals). 



Pal-Eoneilo EMARGiXATA. (Courad.) (Fig. 177.) (Pal. 

 N. Y., Vol. v.. Pt. I., p. 838, PI. L.) 



^ -N "^ 





y^- 



^: 



"-^^^ 



^^. 



Fig. 177. Palceoneilo emarginata. Two right and two left valves, showing variations 

 (from Hall;. 



