NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. 141 
motion. The colour of the hepatic ceca in the cerata is 
from a bright brick-red to vermillion and is quite opaque ; 
while the surrounding integument (‘‘ sheath” of Alder 
and Hancock) is colourless and transparent. There is 
a ring of opaque white pigment on the surface near the 
apex (Pl. VIII. fig. 1, pg.) The cerata are placed indis- 
tinctly in rows which are placed very close together and 
are 18 to 20 in number. There are about 6 cerata in each 
row, the smallest being as usual on the outside. Some 
of the smaller cerata have little or no colour, and in one 
of our specimens we found one of the largest cerata near 
the middle of the body to be perfectly clear and colourless 
—apparently the hepatic caecum was absent. 
The hepatic ceca in this species are very distinctly 
lobulated (Pl. VIII. figs 1, 3,4 and 5). Im some cases it 
might be said that short branches are present, thus lead- 
ing in the direction of the distinctly branched ceca of 
Doto. Figure 3 shows one of the cerata of Coryphella 
rufibranchialis in longitudinal section and exhibits the well 
marked lateral lobes or short branches of the cecum, while 
fig. 5 shows the condition, and arrangement of the red (r) 
and yellow (y) pigmented masses, in part of a slightly 
squeezed living specimen. 
The broad ring of superficial pigment near the tip of the 
cerata hides the greater part of the cnidophorous sac (Pl. 
VIII. fig. 1, pg.) allowing only the apex and the wide 
base to be seen. The sac is large and of elongated pyri- 
form shape, and has a very muscular wall. The cnidocysts 
are long and narrow and rather numerous. They nearly 
meet in the centre of the sac (Pl. VIII. fig. 4, ¢.c.) The 
- connecting tube between the cnidophorous sac and the 
hepatic cecum is so short as to be reduced to a mere 
opening (see Pl. VIII. fig. 1, surface view, and fig. 4, 
section), on the edges of which the smaller basal cnidocysts 
