INDEX OF FAMILIES. 
LAND AND FRESHWATER. 
PAGE 
ACICULIDZ 200 ae 58 PALUDESTRINID/ 
ARIONIDZEZ SE da0 11 PHYSIDZ 
AURICULID£ _... Ser 45 POMATIID® 
CEAUSTEIIDAL =. 500 4] STENOGYRID£ ... 
DREISSENSIID 200 59 SUCCINEID 
ENDODONTID S00 13 TESTACELLIDA 
ENIDAT =. 30¢ S06 37 VALVATIDZ 
HELICIDAt 300 an 16 VERTIGINID£~ ... 
LIMACID nac 50e 3 VIVIPARID/ 
LIMN HID ado 206 45 UNIONIDZ& 
NERITIDZ 300 ae 58 ZONITID 
MARINE. 
ANOMIIDA£ 556 SOC 66 NUCULID/ 
ARCIDZ ... Ae nec 66 OSTREID 
ASSIMINEIDZ ... 508 74 PATELLIDZ& 
ASTARTID 560 soe 68 PECTINIDA 
AURICULID .... 50% 78 PHILINID/ 
BUCCINIDZz age 506 76 PHOLADIDZz 506 
CARDITID ane 3O0 ae PLEUROTOMARIIDE. ... 
CE RIED As... sod 75 PLEUROTOMID 
CYPRAHIDA oe 300 75 PTERIID/ : 
DENTALIIDZ ... 200 72 PYRAMIDELLID 
EULIMID2 506 306 76 RISSOIDZ 
GARIDAS <:: 550 S80 a SAXICAVIDA 
HOMALOGY RIDAz ae 75 SCALID A: ... 
LAMELLARITD: ape 75 SCAPHANDRID/ 
EERPTONIDA <.: 500 69 SCROBICULARIIDz 
LITTORINID# ... 060 73 SOLENID® 
LUCINID: ap6 506 68 TELLINIDZ 
MACTRIDZE out 506 70 TEREDINIDA 
MURICID& 508 ade 76 TORNATINIDE. ... 
IMYEIDA . ee 3100 71 TROCHID 
MYTILIDZ 500 aa¢ 66 TURRITELLIDZ 
NASSID#... aes Soc 77 VENERIDA 
NATICIDZ£ re occ 75 
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