408 ïï- UEATII, The uervous system and subradulîir organ of Solenogastres. 



Explanation of Figures. 



Plate 2 7. 



The anterior half of Figs, 1 and 2 and all the nerves in Figs. 3 

 and 6 have been drawn from dissections; the posterior half of Figs. 1 

 and 2 have been carefully reconstructed from sections. Only the more 

 important nerves are shown. 



The following abbreviations have been used in lettering the figures: 

 h.y buccal ganglia pi palliai cords 



cl cloaca p pedal nerves (shaded) 



C.p cloacal passage pc pericardium 



d.c dorsal commissure r radula 



d.o dorsal sense organ s.r seminal receptacle 



I. g posterior palliai ganglion S.r. g subradular ganglion. 



n nerves to front end of body 



Fig. 1, Anterior and posterior portions of the nervous system of 

 an unnamed species of Proneomenia. 



Fig. 2. Same of a species of Rhopalomenia. 



Fig. 3. Side view of nervous system and reproductive organs in 

 Proneomenia. 



Fig. 4. Diagram illustrating relation of brain and principle nerves 

 in front end of Proneomenia. Circles represent subradular organs whose 

 ganglia are more outwardly placed while the larger buccal ganglia are 

 posterior. 



Fig. 5. Longitudinal section through radula of Proneomenia. 

 he buccal commissure, r. s radular support, s.r. c subradular commissure, 

 s.r.o subradular organ. 



Fig. 6. Side view of nerves and reproductive organs in Rhopalo- 

 menia. 



