1880. J NATURAL SCIENCES OF PHILADELPHIA. 121 



<;. The hook of a pltite, from the side.* ^f^. 



7. Salivary gland ; a, duct ; 6, posterior end. 



8. a, pa7's pylorica intestini ; b, vesica fellea; c, intestinum 



descendens. 



9. Part of the vas deferens^ with its stricture,* J-?-^-. 



Acanthodoris pilosa (M.) rar-. hrunnea albopapillosa. 



10. ab, Lancet-formed blades from the under side,* i?^. 



11. ff, Part of left; 6, of right lancet-formed blade; c, adjoining 



part of the armature of the mouth,* ^f^. 



12. aa, Upper part of three lateral plates ; bb^ two series of exter- 



nal plates ; from the sheath of the radula,* ^f ^. 



Acanthodoris pilosa (M.) var. albescens. 



13. Elements of the armature of the mouth,* ^f^. 



14. Isolated element,* ^f^. 



1.^. Upper part of a lateral plate, from the outside,* ^\-. 

 1 6. Upper part of a lateral plate, from the inside,* ^f ^. 



Plate V (XIII). 



Lamellidoris varians, Bergh. 



1. The central nervous system, obliquely, from the under side. 



* 5j5 . d^ ganglia cerebro-visceralia; bb, ganglia pedalia; c, 

 gangl. penis and gangl. genitale; d, ganglia buccalia; ee^ 

 ganglia gastro-cesophagalia. The eyes and the otocysts 

 visible. 



Acanthodoris pilosa (M.), var. albescens. 



2. The bulbus phar^-ngeus, from the side ; a, cuticula and the 



lancet-formed blades; 66, mm. retractores bulbi ; c, the 

 sucking-crop ; c?, salivary gland, above this the right buccal 

 and gastro-oesophageal ganglion ; e, the sheath of the radula 

 /, the crop of the oesophagus ; g, continuation of the oeso- 

 phagus. 



3. Lateral plates, from the outside,* ---^-fi. 



4. Partof the armature of the spermatod net, with its hooks,* -^(^ . 



9 



