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 



* intestinal crura 



Im longitudinal muscle 



m mouth 



o ootype 



e esophagus 



om oblique muscle 



os oral sucker 



All drawings were made by the 

 or an Edinger drawing apparatus. 



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 



aid of either a camera lucida 



