NUDIBRANCHIATE GASTEROPODA. 49 



Coryphella sp. (anonyma). 



Fig. 14. A piece of the edge of the masticatory process of the mandible, a the free edge. 



— 15. A median tooth, from the under side. 



— 16. Two lateral teeth, from above. 



Figs. 11 — 16 drawn with cam. Inc. x 350 diam. 



Aldisa zetlandica (Aid. et Hanc). 



Fig. 17. The central nervous system, from above, x 55 diam. aa cerebral ganglia, bb pleural ganglia, 

 cc pedal ganglia. 



— 18. Otocyst. x 350 diam. 



— 19. One of the largest tooth-plates. 



— 20. One of the outermost plates in the series of teeth. 



Figs. 19 — 20 drawn with cam. Inc. x 750 diam. 



— 21. Glans penis, x 350 diam. 



— 22. A piece of the latter part of the seminal duct, x 350 diam. 



— 23. Elements of the armature of the same, x 750 diam. 



Amphorina Alberti, Ouatref. 



Fig. 24. The fore end of the mandible, with a the hinge-part, /; the masticatory process. 



- 25. A tooth-plate, from above. 



— 26. A similar one, from the under side. 



- 27. A similar one, lateral view. 



- 28. Penis, with a its hook. 



Figs. 24 — 28 drawn with cam. luc. x 350 diam. 



Doridoxa Ingolfiana, Bgh., var. 



Fig. 29. Median teeth, from above (the denticles drawn too strong). 



— 30. Lateral tooth-plates of the outer third part of a series. 



Lamcllidoris muricata (O. F. Mull.). 



Fig-3 1 - A piece of the radula; a false median tooth-plates, b lateral tooth-plates, c outermost tooth-plates. 

 Figs. 29 — 31 drawn with cam. luc. x 350 diam. 



— 32. Crop of the bulbus pharyngeus, a the stem of the same. 



/& 



