NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. 931 
such as that figured by Bergh (loc. cit. pl. ii., fig. 22). 
Sections, however, show the true nature of this pigmented 
tract. 
(3) Masses of large distinctly nucleated cells lying in 
meshes of fibrous connective tissue. These are possibly 
mucus-secreting glands. They occur chiefly in the smaller 
branches of the cerata. 
We figure (Pl. XIT., fig. 4) a transverse section through 
one of the cerata of an Holis, with the contained hepatic 
cecum, to compare with that of Dendronotus (Pl. XII., 
fig. 8). 
At the bases of the dorsal processes in Dendronotus the 
blood spaces, which may be called the ceratal sinuses, com- 
municate with the large anterior and posterior dorso-lateral 
veins (Pl. XII., fig. 2, d.l.v.) which cpen directly into the 
auricle. At the point of junction of a ceratal sinus with the 
dorso-lateral vein, a lateral sinus is found running ventrally 
through the mesoderm of the body wall, outside the liver. 
The diagrammatic figure (Pl. XII., fig. 7), constructed from 
several sections, shows how the hepatic cecum comes into 
close proximity with these blood sinuses, and so may have 
given rise, in dissections, to the appearance of a direct 
continuity between the liver and the spaces in the dorsal 
papille, a continuity which our sections show does not 
exist. 
Family. MELIBIDE. 
Doto coronata, Gmelin. 
Taken off the north coast of Anglesey, in the ‘‘ Hyena”’ 
expedition of 1886. This species was present in great 
numbers on 2nd April and on 16th May, 1889, at Hilbre 
Island, while none had been seen a month before on the 
same ground; thirty-four specimens were collected, all 
from the under surfaces of stones covered with large 
colonies of the Hydroid Clava mwulticornis. 
