



126 PROCEEDINGS OF THE ACADEMY OF [18T9. 



Hermissenda opalescens (Cooper). 



9. Mandible,* " ; a, c?*ista connectiva ; &, process, mastic. 



10. Part of the masticating edge ;* a, superior (anterior) part ; &, 



posterior part, 5 y fi . 



11. Inferior margin of the hook of a tooth,* ~. 



12. Cnida?,* *p. 



Coryphella s\y. 



13. Hind part of masticating edge from the inside;* a, posterior 



part, iM. 



14. Part of the radula ;* aa, lateral teeth, ^-p. 



Flabellina iodinea (Cooper). 



15. Anterior part of the posterior third of the masticating edge,* 



1 



16. A lateral tooth, from the side,* ^-p. 



IT. A lateral tooth,* *p. 



Dendronotus purpureus, Bergh. 



18. Elements of the prehensile collar,* ^p. 



19. Part of the middle of the collar,* *M. 



20. Elements of the posterior part of the collar,* ^p. 



Dendronotus Dalli, Bergh. 



21. Exterior part of a row of teeth ;* a, outer tooth, ^p. 



Plate II. 



Hermissenda opalescens (Cooper). 



1. Three plates of the radula, from one side,* ^~. 



2. Two ditto, a little oblique, from above,* ^-p. 



3. Two of the anterior teeth,* ^p. 



4. The hook of the hindmost developed plate,* -p. 



5. A lobe of the hermaphroditic gland,* ^p ; a, efferent duct. 



6. Penis; a, spermatoduct ; bb, prseputium ; e, glans with its 



orifice. 



Corypjhella sp. 



7. The right mandible from the outside,* "; a, the articulation; 



&, the cutting process. 



8. The hinder part of the cutting edge from the outside,* ^P ; a, 



posterior part. 



