(124) 



Plate IV. 



ACLESIA CIBRHIFERA, Q. et G. 

 FIG. 



1. Upper margin of the gill (rhachis). 



•2. a, Hermaphrodite duct ; b, anterior genital mass ; c, spermatocysta 

 d, sperm-oviduct ; c, spermatotheca ; /', vulva. 



3. From the interior part of the rasp. 



4. One of the plates. 



(Figs. 3-4 with Gam. 200 x .) 



5. Lateral plate. 



6. Lateral plate. 



7. Three outermost plates. 



(Figs. 5-7 drawn by Cam. 350 x .) 



Pleurobraxch.ea capensis, B. 



8. Piece of the mandiljle, from the side. 



9. Piece from the surface. 



(Figs. 8-9 with Cam. 350 x .) 

 10 and 11. Plates of the rasp in different positions. 200 x . 



Pleukobranch.i:a melanopus, B. 



12. Elements of the mandible, from the side. 200 x . 



13. Piece of the mandible, from the surface. 



14 and 15. Plates of the rasp, in different positions. 

 (Figs. 13-15 by Cam. 350 x .) 



OSCANIOPSIS PLEUKOBRANCH.iiANA, B. 



16. Part of the frontal margin. 



17. Part of the mandibles. 350 x . 

 18 and 19. Largest plates of the rasp. 



20. Outer end of a series of plates, a, outermost. 



(Figs. 18-20 with Cam. 200 x.) 



21. Salivary glands with duets. 



OSCANIELLA NIGROPUNCTATA, B. Var. 



22. Element of the mandible. 



23. Innermost plates. 



24. Plates from the inner half of the rasp. 



25. Plates from the outer half of the rasp. 



26. Outer part of a series of plates, a, outermost. 



(Figs. 22-26 drawn by Cam. 350 x .) 



Berthelea uranulata, Krauss. 



27. Shell from the upper side. 5/1. 



28. Piece of mandible. 350 x . 



