NUDIBBANCHIATA OF THE L.M.B.C. DISTKICT. 1(33 



nature. Ancida is also distasteful and is conspicuously 

 coloured. Do^^is is less distasteful and is still protectively 

 coloured ; while Demlronotus, which we believe to be edible, 

 is very effectually concealed amongst the seaweeds it lives 

 on by its large branched cerata and red-brown colours. 



Explanation of the Plates. 



Where not otherwise stated, the drawings were made 

 from serial sections prepared by hardening in Kleinen- 

 berg's picric acid and graduated alcohols, staining in 

 picrocarmine, embedding in paraffin and cutting with the 

 rocking microtome. 



Keference Letters. 



ap. opening of cnidophorous sac to exterior; ^r. bran- 

 chiae ; h.s. blood sinus ; c. cnida ; ex. cnidocysts ; c.s. 

 cnidophorous sac ; c.cl. connecting duct between cnido- 

 phorous sac and hepatic caecum ; cer. cerata ; d. duct of 

 gland ; e.p. epipodial ridges, folds, or processes ; ec. ecto- 

 derm ; /. foot ; f.gL foot glands ; g.c. goblet-like mucus- 

 secreting cell ; gl, gV glands ; h.c. hepatic c^cum ; k. knob 

 on papillae of cerata of Boto ; 1. 1, lateral duct of liver lead- 

 ing from hepatic caeca ; m. mantle ; m.p. metapodium ; 

 mes. mesodermal tissue; m.f. muscle fibres; m.l. median 

 duct of liver in body; oA. ovotestis ; pp. propodium ; 

 pg. pigment; rh. rhinophores; r. red pigment; t. tentacles ; 

 y, yellow pigment. 



