88 ILLINOIS BIOLOGICAL MONOGRAPHS [306 



DESCRIPTION OF PLATES 



LIST OF ABBREVIATIONS 



c cirrus ov ovary 



cm circular muscle p pharynx 



cp cirrus pouch pp prepharynx 



g ventral glands rs receptaculum seminalis 



ga genital atrium ru receptaculum seminalis 



i intestinal crura uterinum 



Im longitudinal muscle sg shell gland 



m mouth u uterus 



o ootype v vas deferens 



e esophagus vd vitelline duct 



om oblique muscle vr vitelline reservoir 



os oral sucker w wall of excretory tubule 



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

 or an Edinger drawing apparatus. 



