88 



ILLINOIS BIOLOGICAL MONOGRAPHS 



[306 



DESCRIPTION OF PLATES 



LIST OF ABBREVIATIONS 



c Cirrus 



cm circular muscle 



cp cirrus pouch 



g ventral glands 



ga genital atrium 



i intestinal crura 



Im longitudinal muscle 



m mouth 



ootype 



e esophagus 



om oblique muscle 



OS oral sucker 



ov ovary 



p pharynx 



pp prepharynx 



rs receptaculum seminalis 



ru receptaculum seminalis 



uterinum 

 sg shell gland 

 u uterus 

 V vas deferens 

 vd vitelline duct 

 vr vitelline reservoir 

 w wall of excretory tubule 



All drawings were made by the aid of either a camera lucida 

 or an Edinger drawing apparatus. 



