230 



angular ]»licatioiis on each valve, of which four to seven 

 mark the fold or sinus ; c-onoentrie undulating striae. 



P^ound in the lowei- Moscow shale, at Sections 4 and 5 

 (rare); Encrinal limestone, at Section 5 (rare); Stictopora 

 bed, at Section 5 (rare); Nautilus bed, in Erie Cliff (?), (very 

 rare). 



Camakot(echia SAPPHO. Hall. (Fig. 140.) ( Pal. N. Y., 

 Vol. lY., ]). 340, PL LIY.) 



Fig. 140. CaiiKinitarhia sappho. Front, cardinal, doi-.sal (brachial), ventral (pedicle), 

 and lateral views of a characteristic .specimen (.from Hall). 



DistinguLshiii^- Clmnicttrs. — Rather large size; robust 

 character; broader than long; shallow pedicle valve, which 

 is prominently convex only at the umbo, and is depressed 

 towards the front into a sinus, which first becomes percepti- 

 ble near the middle of the length ; more or less incurved beak 

 of pedicle valve ; gibbons brachial valve, with the fold con- 

 spicuous only near the front; coarse plications, twenty to 

 twenty -four on each valve in mature specimens, all incised 

 towai'ds the front, for the reception of the opposite plica- 

 tion ; sinus and fold with four to six plications each. 



Found in the Encrinal limestone, at Section 5 (frequent) ; 

 Lower shales, down to three feet below the Encrinal lime- 

 stone, at Sections 5 and 6 ; seventeen to twenty-one feet 

 below the Encrinal limestone, at Section 7 (common) ; mid- 

 dle Trilobite bed (very rare) ; also in the Pleurodictyum beds, 

 in Averv's Creek. 



