(118) 



Plate I. 

 Aplysia Gilchristi, 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 allochroa, 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 stomachal plates. 



10. Penis, a, prostata. 



Aplysia gargantua, B. 



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



12. Elements of mandibular plate. 



13. Hooks of the palate. 

 11. A lateral plate. 



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



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



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



17. a, Before the cardia region of the masticatory stomach ; b, facets for 



masticatory plates. 



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



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



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



21. Transverse section of the head of the glans. 



Aplysia monochroa, B. 



22. The mantle shield. 



23. Elements of the mandibles. 350 X , 



24. Hooks of the palate. 



