AdAMS : OBSERVATIONS ON THE PAIRING OP ARION ATER. 119 



Fig. 5. — Showing genital system (enlarged). — ag. albumen gland ; hd. hermaphrodite duct ; 

 ot. ovotestis ; od. oviduct ; vd. vas deferens ; ep. epiphallus ; sp. spermatheca ; ua. upper atrium ; 

 la. lower atrium ; in. edge of mantle. 



Fig. 6. — A tracing by Mr, J. C. Melvill from F6russac's work, 



