201 



ep, epithelium. 



epv, ealarged part of veutricle. 



es, elastic sheath. 



fc. filter-chamber. 



g', t^ ' S^ > gonapophyses and their primitive pouches. 



gci, génital area. 



/, iutima. 



im, intersegmental muscle. 



imb, iuterse^mental membrane. 



Un, longitudinal muscles. 



ni, muscles. 



oe, œsophagus. 



ou, origiu of uriuary tubes. 



ovi, oviduct. 



R, r, rec, rectum. 



si, small intestine. 



sp, spiracle. 



tin, transverse muscles, 



u, uriuary tubes. 



V, vagina. 



ven, ventricle 



X, origin of génital pouches. 



y, opening of ejaculatory duct. 



z, ridge around génital area. 



