Preface .1 



Ackno'^.'ledgeraeiit;: E 



Introinction 5 



.4nalvs is of t he 7auiig 6 



3iol":p'icsl ilnalr/eis 



t/ ' 



o 



Scoloeical Analj-sls , 13 



Geological Analj'cis 20 



S;;steriiatio DiccuGSion 42 



Order PrionocTesmacea d-2 



Family- lluculidae. . . .- 42 



?aiiiil^- le di dae 49 



7amil3? limopsidae 76 



P'amil;- Arcidae ni 



Pamily Pinnidae 1"! 



Family Helinidce 175 



Pamilj; Pteriidae 176 



?amili^ Oatreidae 178 



.?arailv' Pectinid -e 194 



Family Spond^^li d.ae £?' t 



Familj; limia ae 246 



■^^amilv Anomiidae 252 



Farail, ,^ 'i ilidae 2 62 



family 'Dreicceniidae 265 



Family J ;:lid.&e 207 



