EXPLANATION OF PLATE XIX. 



act., acetabulum; dr., cirius; dr. sac, cirrus-sac; ex. po., excretory 

 p:re; ex. ves., excretory vesicle; ge7i. po., genital pore; in., intestinal 

 csecum; La. can., Laurer's canal; vio., mouth; oe., cesophagus; oa., ovary; 

 or., oral sucker; at., obtype; ovi., oviduct; p. prs., pars prostatica; phx., 

 pharynx; phx. gl., pharyngeal gland; sh. gl., shell gland; tes., testis; 

 ves. sem., vesicula seminalis; ut., uterus; yo. gl., yolk gland; yo. dt., 

 yolk duct; vag., metraterm. 



All drawrings were made with the aid of a camera lucida except 

 figure 4. 



Fig. 1. — Reiiifer megasorchis ; ventral view, x 19. 



Fig. 2. — Renifer acetabidaris ; ventral view, x 59. 



Fig. 3. — Renifer kansensis ; ventral view. X 20. 



Fig. 4. — Diagram showing the female genital organs of R. mega- 

 sorchis. 



