BRACHIOPODA—PROTREMATA. 



239 



135. C. complanata Hall. (Fig. 291, a.) Devonic. 

 Width 1 inch or more. About two thirds as long as wide. 



Cardinal spines directed obliquely outwards. Surface with fine, 



closely arranged, bifurcating 



striae. 



Oriskany of New York, On- 

 tario and Cumberland, Md. 



XLIV. Chonopectus Hall and 

 Clarke. 



Ckonetes-XWae in shape, and 

 presence of spines but with the 

 beak of the pedicle valve de- 

 pressed or distorted, leaving a 

 flattened area which is probably 

 a scar from attachment in early 

 growth. Surface ornamented 

 with a normal series of con- 

 centric growth lines and also 

 with a double oblique series of 

 wrinkles looking much like the 

 " engraving on a machine-turned watch case." 



Kinderhook and Burlington (Lower Carbonic). 



136. C. fischeri (Norwood and Pratten.) (Fig. 291, b y c.) 



Lower Carbonic. 



Semielliptical. Hinge line with five to seven nearly straight 

 spines on each side of the beak. Surface marked by fine radiating 

 and concentric striae, beneath which is a " textile " appearance due 

 to a double set of diagonal lines. 



Kinderhook and Burlington, of Pennsylvania, Iowa, Missouri, etc. 



Fig. 291. a, Chonostrophia compla- 

 nata; b, Chonopectus fischeri; c, enlarge- 

 ( After Hall.) 



ment of surface of same. 



XLV. Strophalosia King. 



Small, semicircular. Hinge line straight. Beak of pedicle valve 

 with scar indicating attachment. Cardinal area of pedicle valve 

 especially conspicuous ; delthyrium large, covered ; teeth large and 

 cardinal process erect and bifid. Surface of pedicle valve covered 

 with spines ; that of brachial valve spinous, lamellose or smooth. 

 Devonic-Carbonic. 



