268 



Cardiola ketrostkiata. von Bueli. (Fig. 190.) {Glyp- 

 tocardm speciosa. Hall: Pal. N. Y., Vol. V., Pt. I., p. 426, 

 Pis. LXX., LXXX.) 



Distinguishing Characters. — Small size, nearly circular out- 

 line; oblique triineatioii from beak to posterior extremity; 



' ix} 



Fig. 190. Cardiola retrostriata. From the Genesee slate, enlarged to four diameters 

 (from Hall I. 



broad, flat, ronnded plications, with very narro\y inter- 

 spaces; arcliiiii;' lamellose concentric striti^. 



Found in the lower gray Naples shales and Goniatite layer, 

 at Sections 1 to -4 (common); also in the Strophalosia bed, 

 on the Lake Shore (one fragment of a large specimen). 



Gems CYPRICARDINIA. Hall. 



[Etv. : Resembling the geuus Ci/pricairlia.] 

 (1859 : Pal. N. Y., Vol. III., text, p. 266.) 



Shells with nnecpial yalyes, the right yalye more conyex. 

 Outline yarying from oboyate to trapezoidal, with a short 

 rounded anterior end and a wider obliquely truncate poste- 

 rior end. Sub-anterior incuryed beaks; straight or arcuate 

 cardinal line, ^^'hieh arises from the beak ; external ligament ; 

 one long lateral tooth; concentric lamellose undulations and 

 flner strict, and in some specimens radiating strite, charac- 

 terize this genus. 



Cypricardixli indenta. (Conrad.) (Fig. 191.) (Pal. 

 N. Y., Vol. v., Pt. I., p. 485, PI. LXXIX.) 



Distinguishing CJmracters. — Slightly sinuate basal margin ; 

 straight cardinal line ; distinct cincture on right valye, less 



