ILS) 



Plate I. 

 Aplysia Gilchbisti, B. 



FIG. 



1. Median plate. 



2. Outer end of two series of plates, aa, outermost plate. 



(Figs. 1-2 drawn by Cam. luc. 200 x .) 



3. A lateral plate. 350 x . 



Aplysia allochkoa, B. 



4. The shell, from above. 3/1. 



5. Elements of mandible plate. 350 X . 



6. Median plates. 



7. First lateral plate. 



8. Outer end of two series, aa, outermost plate. 



(Figs. 6-8 drawn by Cam. 200 x .) 



9. One of the smaller stomaebal plates. 



10. Penis, a, prostata. 



Aplysia gahgantua, B. 



11. The shell, from beneath. 3/1. 



12. EleJiients of mandibular plate. 

 18. Hooks of the palate. 



14. A lateral plate, 



15. Outer end of a series of plates, a, outermost plate. 



(Figs. 12-15 drawn by Cam. 200 x .) 

 IG. One of the inner lateral plates. 350 x . 



17. a, Before the cardia region of the mastieatory stomaeh ; b, facets for 



masticatory plates. 



18. A thorn from the region a in Fig. 17. 



19. Penis, a, region of the glans ; b, prteputium. 



20. Hinder end of the prajputium opened, the glans exposed. 



21. Transverse section of the head of the glans. 



Al'LVSlA MONOCHKOA, B. 



22. The mantle shield. 



23. Elements of the mandibles. 350 x . 



24. Hooks of the palate. 



