124 PROCEEDINGS OF THE ACADEMY OF [1880- 



6. Median part of a series of the teeth ; a, (false) median plates 

 of the rhachis; 66, external plate of the same; ce, first 

 lateral plate ; c?, third lateral plate,* ^K 



1. Continuation of the former; a, fourth plate; 6, outermost 

 plate,* ^^. 



8. Four (inner) uncinal plates ; a, the second ; b, the fifth,* ^^. 



0. First lateral plate,* ^f^. 



1 0. Seventh and eighth external plates,* -^-|^. 



11. Salivary gland; a, gland ; b, duct,* -Y- 



Triopa clamgera (M.). 



12. Tentacle. 



1 3. Part of the armature of the penis.* ^f ^. 



Polycera pallida, Bergh. 



14. The glans penis,* -^-|^. 



Plate VIII (XVI). 



Polycera pallida^ Bergh. 



1. Central nervous system, from the upper side,* Y- ; aa, visceral 



ganglia; 6, ganglia buccalia and gastro-oesojyhagalia. 

 'J. Part of the radula with two rows ; aa, interior ; 66, exterior 

 lateral plates ; cc, uncinal plates,* -^-f 



3. Exterior lateral plate, from the side,* ^^. 



4. Under side of the two lateral plates:* aa and 6, as in fig, 2. 



* 35 

 1 



* 35 



5. First lateral plate, from the side,* ^4' 

 H. The same, from above,* 3.^^. 



7. Hook of the second lateral plate,* ^^. 



8. Genital papilla and everted penis with its glans ; 6, prominent 



fold of the duct of the mucous gland. 

 0. Glans of the penis, with the end of (6) the spermatoduct,* 

 ^f ^ ; a, point of the glans. 



Archidoris Monfereyensis (Cooper). 



10. Large lateral plate, from the side,* ^f-^. 



JI. Outer part of two series of plates with 4 plates; aa, outer- 

 most,* -y-. 



