EXPLANATION OF PLATE 1 



Figure 1. Camera lucida drawing of ventral view of a stained speciuTen : o. s., 

 Oral sucker ; ph., pharynx ; oe., esopliagus ; a., acetabulum ; c. p., 

 cirrus pouch ; ov., ovary ; s. r. seminal receptacle ; s. g., shell gland ; 

 t., testis ; v. f., vitelline follicle ; L, intestine ; ut., uterus ; e. p., 

 excretory pore. 



2. Normal position of the cirrus pouch and end ducts of the reproductive 



system. 



3. Cirrus pouch showing the cirrus protruding from the genital pore. 



4. Diagrammatic representation of the relationships of the female 



reproductive organs : ov., ovary ; o. d., oviduct ; s., seminal recep- 

 tacle ; L. c, Laurer's canal ; v. d., transverse vitelline duct ; s. g., 

 shell gland. 



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U. S. GOVERNMENT PRINTING OFFICE: 1931 



