NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. 163 
nature. Ancula is also distasteful and is conspicuously 
coloured. Doris is less distasteful and is still protectively 
coloured ; while Dendronotus, 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. 
Reference Letters. 
ap. opening of cnidophorous sac to exterior; br. bran- 
ehize; b.s. blood sinus; ¢. cnida; c.c. cnidocysts; ¢.s. 
enidophorous sac; ¢.d. connecting duct between cnido- 
phorous sac and hepatic cecum; cer. cerata; d. duct of 
eland; e.p. epipodial ridges, folds, or processes ; ec. ecto- 
derm; f. foot; f.gl. foot glands; g.c. goblet-like mucus- 
secreting cell; gl, gl’ glands; h.c. hepatic cecum; k. knob 
on papillee of cerata of Doto; U./. lateral duct of liver lead- 
ing from hepatic ceca; m. mantle; m.p. metapodium ; 
mes. mesodermal tissue; m.f. muscle fibres; m./. median 
duct of liver in body; o.t. ovotestis; p.p. propodium ; 
pg. pigment; rh. rhinophores; *. red pigment; ¢. tentacles ; 
y. yellow pigment. 
