GENERAL INDEX. 151 



Zeacrinus discus M. & W 11,312*; V.565 



elegans Hall 11,185 



formosus Worthen V, 549* 



impressus (McCoy) 11,313 



intermedius Hall 11,181 



keokuk Worthen VII, 303* 



lyraM. & W V.432* 



mucrospinus M. Ch 11,313; V, 548, 563*, 565 



perangulatus White V,427 



pikensis Worthen v VII, 304* 



planobrachiatus M. & W II, 240* 



ramosus Hall 11,187; V.429 



scobina il. & W V,426*,430 



serratus M. & W V.428* 



spinibrachiatus White V.442 



stimpsoni Lyon , VII, 298 



subtumidus Worthen '. V.548* 



troostanus M- & W II,186*,187t 



sp. indet V, PL i, fig. 4* 



Zittelella Ulrich and Everett Vin,217,221,222,235,255,257,267,275 



" (?)infelix U. & E VIII,271*,274 



in sculata U. &E VIII.235,271 



lobata M. & E Vin,235,270* 



trentonensis Worthen .. Vin,235,270 



typicalis U. & E VIII,235,268* 



var. pistilliformis U. & E VIII,235,269* 



" subrotunda U. & E VIII.235,269* 



" turbinata U. & E VIII,235,269* 



Zoantharia 111,804,368,407,420; V.560; VI.525; VIII, 71,216 



Zygobatis Agassiz 11,59 



Zygospira Hall in,377 



concava (Hall) ni,381 



modesta (Say) 111,379 



subconcava M. & W . . ...111,380* 



