(122) 



Plate III. 



Aplysia rOIKXLIA, B. 



FIO. 



1. The shell from beneath. 2/1. 



2. Median plate. 



3. Fifth lateral plate, from within. 



4. A lateral plate. 



ApLYSIA EUSIPHONATA, B. 



5. The mantle shield, from above, with sipho. 



6. The same, from the right side. 



7. Elements from the mandible. 

 S. Hooks of the palate. 



9. ]\Iedian plates of two series. 

 10. One of the interior lateral plates. 

 11 and 12. Largest lateral plates. 



13. Outer end of a series of plates, a, outermost. 



(Pigs. 2-13 drawn by Cam. 200 x .) 



14. Stomachal plates. 55 x . 



15. Penis. 



ACLKSIA CIUKHIFEKA, Q. et G. 



16. Mantle region, a, rudiment of mantle; b, branchia ; c, anus. 



17. Mandible. 



18. Elements of mandible. 350 x . 



19. Piece of the palate plate, 350 x . 



20. Anterior end of the bulbus pharyngcus with the rasp. 



21. Median and first lateral plates. 350 X. 



22. The penis. 



23. The glans. 



24. Hook of the penis. 350 x . 



