CRUSTACEA— OSTRACODA. 359 



86. K. pennsylvanica (Jones). (Fig. 1663, w-/>.) Silurlc. 

 With a narrow median sulcus and a second one just behind this; 



anterior end nearly rectangular. (Type of genus.) 



Manlius (Lewistown limestone) of Perry Co., Pennsylvania, etc. 



87. K. halli (Jones). (Fig. 1663, q.) 



Like the preceding but with three sulci, somewhat unevenly 

 spaced, the median is a little behind the center; all extending 

 two thirds the distance to ventral margin. 



Salina of New York, etc. 



88. K. turgida Ulrich and Bassler. (Fig. 1663, r_,.y.) Devonic. 

 Differs from the preceding in its rounded anterior end, shorter 



hinge line, shorter and less definite sulci. 



Coeymans limestone of Cumberland, Maryland. 



XXXV. Beyrichiella Jones and Kirkby. 

 Small, length i mm. or less, elongate, subquadrate, thickened 

 anteriorly, bilobed by a rather broad median sulcus ; lobes con- 

 nected by low ventral ridge; left valve overlapping right. Geno- 

 type B. cristata J. and K. Three species, one of them American. 

 Carbonic. 



89. B. confluens '(Ulrich). (Fig. 1663, ^.) Mississippic. 

 Lobes confluent in the broad ventral ridge which occupies about 



one half the height of the shell. 

 Chester shales of Kentucky. 



XXXVL JoNESiNA Ulrich and Bassler. 

 Differs from Kloedenella in having the left valve the largest 

 (instead of the right) and occasionally overlapping the right. 

 Length about i mm. Genotype /. fastigiata (Jones and Kirkby). 

 Six described species, two of them American. Carbonic. 



90. J. gregaria Ulrich and Bassler. (Fig. 1666, ^.) Carbonic. 

 With one pronounced narrow sulcus behind the middle, dividing 



two rather indistinct nodes ; a small dorsal spine near anterior end. 

 Upper Carbonic of Kansas City, Missouri. Extremely abundant. 



9 1 . J. bolliaf ormis Ulrich and Bassler. ( Fig. 1 666, c,c'.) Carbonic. 

 Nodes more pronounced, smaller, connected basally by a trans- 

 verse ridge, with a second broad ill-defined ridge below this. 



Cottonwood shales of Kansas ; Upper Carbonic of Texas. 



