(118) 



Plate I. 



Al'LYSIA GlLCHRISTI, B. 

 FIG. 



1. Median plate. 



•2. Outer end of two scries of plates, art, outermost plate. 



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

 3. A lateral plate. 350 x . 



Aplysia allochroa, B. 



■1. The shell, from above. 3/1. 



5. Elements of mandible plate. 350 x . 



C>. Median plates. 



7. First lateral plate. 



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



(Figs. G-S drawn by Cam. 200 x .) 



9. One of the smaller stomachal plates. 



10. Penis, a, prostata. 



Al'LYSIA GAKGANTUA, B. 



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



12. Elements of mandibular plate. 



13. 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 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, prwputium. 



20. Hinder end of the pra^putium opened, the glans exposed. 



21. Transverse section of the head of the glans. 



Al'LYSIA MONOCimOA, B. 



22. The mantle shield. 



23. Elements of the mandibles. 350 x . 



24. Hooks of the palate. 



