PLATE XII. 



Figs. 55-57. Pleurobranchus agassizii MacFarland. 



Fig. 55. Dorsal view of ganglia of Central Nervous System, 

 the nerves and ventral commissures not being repre- 

 sented, c. pi. g., cerebro-pleural ganglion ; p. g. } pedal 

 ganglion; c. p. con., cerebro-pleural connectives; pi. p. 

 con., pleuro-pedal connectives ; e., eye and optic gang- 

 lion. . x 28. 



Fig. 56. Outline of mandibular armature, d., dorsal margin; 

 a., anterior margin ; v., ventral margin, x 28. 



Fig. 57. Ventro-lateral view of right rhinophore. x 12. 



Figs. 58-65. Discodoris branneri MacFarland. 



Fig. 58. Mandibular armature, x 30. 



Fig. 59. Anterior rodlets of mandibular armature, x 214. 



Fig. 60. Posterior rodlets of mandibular armature, x 214. 



Fig. 61. Outermost lateral teeth of i6th row of radula in side 

 view, x 1 20. 



Fig. 62. Outermost lateral teeth of 7th row of radula, in side 

 view, x 1 20. 



Fig. 63. Typical lateral tooth from 5th row, in side view of inner 

 face, x 214. 



Fig. 64. Hooks of armature of glans penis, a, in side view; b, 

 in front view, x 214. 



Fig. 65. Reproductive organs from above, the parts slightly dis- 

 placed so as to show their mutual relations, h. d., 

 hermaphroditic duct; h. amp., hermaphroditic ampulla; 

 sp. d., spermatic duct ; ov. d., oviduct ; pr. g., prostate 

 gland ; v. d., vas deferens ; p., glans penis ; n. a. c., 

 nidamental-albumen gland complex; n. d., duct of nid- 

 amental gland ; u. d., uterine duct ; sp. c., spermatocyst ; 

 spth., spermatotheca ; vag., vagina, passing over prox- 

 imally into the vaginal duct, its distal portion laid open 

 by a triangular incision, x 10. 



