Phac. 



630 



{Phacops logani^ Continued.) 



face worn smooth, showing the hypostom?.! suture; 28, eye en- 

 larged; 44 eye which has lost its lenses by weathering; 24 a, 

 part of an eye magnified ; 25, a hypostoma. Hall says that 

 this species is (after Dalmanites pleuroptyx) more common 

 than any other Lower Helderberg trilobite, often rolled up, 

 usually in fragments, separate heads to be found in the lime 

 shales at various places west and south of Albany. — It has 

 been seen by Dr. Barrett of Port Jervis in White's Stormville 

 limestone on the Delaware. G6, p. 134. — In Perry Co., Pa., 

 three miles east of Icksburg, see Claypole's spec. 12,714 (187- 

 6.) — Lower Helderherg^ VL 



Phacops nupera. {Calymenenupera.) Hall, Geology of 



Vm , pn,n,|| ^1,^,1 |iii^i|iiiii||fpi|ii|i the Fourth District of 



New York, page 262, 

 fig. 116. (See also 

 Calymene Icevis.) Che- 

 mung^ VIII g. 



\\h.^. 



