CRUSTACEA— OSTRACODA, 361 



94. K. subquadrata Ulrich. (Fig. 1666,2, t',;.) Devonic. 

 Proportionately shorter and higher; anterior end rounded; re- 

 ticulation coarse. 



With the preceding. 



95. K. costata (McCoy). (Fig. 1665, w, c.) Mississippic. 

 Elongate, unsymmetrical ; surface with longitudinal inosculating 



costae instead of reticulations. 



Warsaw of Illinois; also ''Lower Carboniferous limestone" of 

 England. 



96. K. lindahli Ulrich. (Fig. 1665, /^-r.) Mississippic. 

 Strongly convex; marginal rim much less prominent than in 



the Devonic species ; ends rounded ; pit pronounced ; surface re- 

 ticulated. 



Warsaw of Illinois. 



97. K. venosa Ulrich. (Fig. 1665,^, ^.) Mississippic. 

 Nearly symmetrical, with straight hinge line and rounded ends; 



surface with fine, rather distant, inosculating and branching 

 ridges. 



Chester of Kentucky. 



98. K. centronota Ulrich and Bassler. (Fig. 1666, k, k' .) Carbonic. 

 Nearly symmetrical, angular ; marginal ridge sharp ; a second 



more strongly curved ridge within, enclosing a central tubercle 

 above the pit; surface finely reticulated. 

 Cottonwood shales of Kansas. 



XXXVIII. Barychilina Ulrich. 



Shell subrhomboidal or ovate; valves thick, unequal, the right 

 the larger, overlapt)ing the left ventrally and at the two ends; 

 edges of valves much thickened ; a sharply defined narrow or round 

 umbilical pit situated in front of the center; surface numerously 

 ridged or coarsely striated longitudinally. Several species. Devonic 

 and Carbonic. 



99. B. punctostriata Ulrich. (Fig. 1665, w-^.) Devonic. 

 Surface striated; umbilical pit one third length of shell from 



front. (Type of genus.) 



Bryozoan bed (Onondaga) of Falls of Ohio. 



