POOD HABITS OP MALLARD DUCKS. 



33 



Table II. — Items of animal food identified in stomachs of mallard ducks and the number 

 in which found — Continued. 



I 



Kind of food. 



Common 

 mallard. 



Black 

 duck. 



Southern 

 black 

 duck. 



Total number of stomachs examined. 



Class Gastropoda (Univalves)— Continued. 

 CalyptrseidsB. 



Crepidula convexa 



Crepidula fornicata 



Pyramidellidse. 



Odostomia impressa 



Odostomia menestho trifida 



Odostomia sp 



Turbonilla sp 



Litorinidse. 



Lacuna vincta... 



Lacuna sp 



Litorina gronlandica 



kLitorina irrrorata 

 Litorina litorea 

 Litorina palliata 

 Litorina rudis 

 Litorina sp 

 odulidee. 



Modulus modulus 



Cerithiidae. 



Bitlium nigrum .' 



Bittium sp 



Rissoidse. 



Paludinella salsa 



Amnicolidae. 



Amnicola limosa 



Amnicola olivacea 



Amnicola parva 



Amnicola peracuta 



Amnicola porata 



Amnicola sp 



Paludestrina sp 



Valvatidae. 



Valvata sincera '. 



Valvata tricarinata 



Valvata virens 



Valvata sp 



ivipaiidse. 



Vivipara intertexta 



Campeloma indecisa 



Campcloma sp 



mpullarudae. 



Ampullaria sp 



Itidse. 



Neritina reclivata .- 



Neritina virginica 



iChidse. 

 Margarites helicinus., 



1,725 



