No. 465.] GENITALIA OF LYMNEA. 675 
Lymnea auricularia Linné. (Fig. 10.) 
Male Organs. — Penis-sac cylindrical, long, of large diameter. 
Penis very long and slender, exceeding the penis-sac in length. 
Penis retractor single, attached to the distal end of the penis- 
sac by a double connection. Prostate in the form of an elon- 
gated, inverted pear, narrowed at either end where it joins the 



Fic. 10.— Genitalia of Z ‘cule 

ovisperm duct and prostate duct. The prostate is dark gray in 
color with the exception of a narrow band of white on the 
Border, ^ 
Female Organs. — The ovotestis is of the usual form. The 
ovisperm duct is of medium length. The oviduct is a much 
