NUDIBRAXCHIATK GASTEROPODA. 



47 



Dendronotus robustus, Verrill. 



Fig. 27. The rhinophore with its sheath and club. 



— 28. The tongue from above with the radula-sheath shining through and with the upper end of 



the radula. 



— 29. a Seminal duct, b glans penis projecting from the bottom of the praeputium. 



Fig. 1 



— 2 



— 3- 



— 4- 



5' 



PI. IV. 



Dendronotus robustus, Verrill. 



The fore end of the animal. 



The tail of the animal. 



Elements of the prehensile ring, x 350 diam. 



A median tooth, from above, x 200 diam. 



The outer end of a series of teeth, a the outermost tooth, b the edge of the radula. x 350 diam. 



Gonieolis atypica, Bgh. 



Fig. 6. The fore end of the animal, from the right side, with a tentacles, b rhinophores, and c dorsal 

 papillae; with the genital ajaerture, the renal pore, d anal papilla, and c foot-brim. 



— 7. The fore end, from above; aa, c as in fig. 6. 



— 8. The central nervous system, from above, drawn with cam. luc; a Ganglia cerebro-pleuralia, 



bb Ganglia pedalia, cc Ganglia olfactoria, dd G. buccalia and gastro-oesophagalia, e coraniis- 



sura subcerebralis, f comm. pleuralis, g coram, pediaea. 



The mandibles from the fore side. ; ,. 



The hinge-part of the right mandible, from before. 



A piece of the masticatory edge, a fore edge, x 350 diam. 



Median tooth-plates, from above. 



Lateral tooth-plate, from the radula. 



Worn foremost (oldest) lateral tooth-plate. 



Figs. 12 — 14 drawn with cam. luc. x 200 diam. 



— 15. Lateral tooth-plate, x 250 diam. 



9 



10. 

 11 

 12 



l 3 

 14 



Gonieolis intermedia, Bgh. 

 Fig. 16. From the middle part of the radula, a median plate, b lateral plate. 

 - 17. A similar piece, lateral view, a and /' as in fig. 16. 



Figs. 16 — 17 drawn with cam. luc. x 350 diam. 



Coryphella salmonacea (Couth.). 

 Fig. 18. Excretory duct of the Gland ptyalina? x 100 diam. 

 — 19. Lateral teeth, x 350 diam. 



