354 



NORTH AMERICAN INDEX FOSSILS. 



64. C. minima Ulrich. (Fig. 1658, z^.) Devonic. 

 Minute, with one narrow oblique sulcus, no frill and single short 



posterior basal spine. 



Hamilton of New York. 



65. C. loculata Ulrich. (Fig. 1658, w.zc/'.) Mississippic. 

 Differs from C. granosa in its deeper, more oblique sulcus, a 



small posterior node behind it, and the frill more pronouncedly 

 lobate or subspinose. 



Kinderhook (Maury shale) of Tennessee. 



XXIX. Beyrichia McCoy. 



Comparatively large (2 to 5 mm. long), moderately convex, 

 semiovate or semicircular to oblong; dorsal angles sharp, ventral 



€2) (UT% 



Fig. 1663. a, Beyrichia granulosa [66), y^ 'j ; b, c, £. waldroncnsis (67), right 

 and left valve, X 7 > d, B. nioodeyi (68), left and right valves on slab, X 7 ! *^»/- 

 K/oedenia initialis (70), side and ventral edge vievi^s of right valve, X ^4 5 St -^j 

 manliensis (71), left valve, X 7 > ^^ ^- sussexensis (72), left valve, X 7 > ^ ^'- wa;'- 

 ginalis (73), X 7 5 7? ^'^- centricornis (74), left valve, X '4 > '^j K. fimbriata (75), 

 left valve, X ^4 5 ^> '''? Hollina insolens (78), exterior and interior of left valve, X 

 14 ; n-p^ Kloedenella pennsylvanica (86), left, end and ventral views of complete shell, 

 X 10; ^, K^' halli (87), X ^4 ; ^» -^j ^- turgida (88), right and left valves, X '4 5 

 t, Beyrichiella confluens (89), left valve, X '4- (After Ulrich and Bassler.) 



rounded; two vertical furrows divide surface into three unequal 

 and unsymmetrical and variable lobes, the anterior generally the 

 largest and sometimes broken; marginal flange flat, overhanging 

 contact edges which are beveled inwards. Seventy-three species, 

 four of them American. Ordovicic-Devonic, chiefly Siluric. 



