EXPLANATION OF PLATE XII. 



Atopos (Fodangia) kempii. 



Fig. 21. — Transverse section of a portion of the wall of intestine, 

 X 230. 



22. — Female genital organ : a, from outer side; 6, from inner 

 side. 



23. — Portions of the walls of two contiguous acini from the 

 female genital organ, X 103. 



24. — Portion of the wall of an acinus, showing an ovum, 

 X 103. 



25. — Two acini from the albuminiparous portion of the female 

 genital organ, X 103. 



26.— Portion of the oviduct and receptaculum seminis, X 4. 

 27. — Male genital organ and the right Simrothian gland, 

 X 10. 



28. — Transverse section of Simrothian gland, Leitz's drawing 

 eyepiece and objective 6. 



29, — Nervous system, X 8. 



30. — Pedal gland, X 2. 



31. — Transverse section of the pedal gland, X 103. 



