U. S. GEOLOGICAL SURVEY 





14 



01° 



10 



13 







A 7 



^ 





11 



MONOGRAPH XXIV PLATE XXIV 



TURRITELLID/E, TROCHID/E, FISSURELLID/E, ACTEONELLID/E, AND CRUSTAC/EA = BALANID/£. 



12 



16 



