(118 



Plate I. 



ApLYSIA GlLCIIKISTI, B. 

 FIG. 



1. IMedian 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 allochuoa, B. 



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



5. Elements of mandible plate. 360 X. 



6. Median plates. 



7. First lateral plate. 



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



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



9. One of the smaller stomachal plates. 



10. Penis, a, prostata. 



ApLYSIA GAKGA^■TUA, 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, outeimost plate. 



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

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



17. a, Before the eardia 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, prteputium. 



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



21. Transverse section of the head of the glans. 



Aplysia monocheoa, B. 



22. The mantle shield. 



23. Elements of the mandibles. 350 x. 



24. Hooks of the palate. 



