. 
NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. 139 
narrows gradually at its lower end and passes over into 
the connec‘ing tube which is bent upon itself in a sigmoid 
curve. Fig. 6showsa section in which hepatic cecum(h.c.), 
connecting tube (c.d.) and cnidophorous sac (c.s.) occur 
together all cut transversely. The large cells or cnidocysts 
in which the thread-cells lie (fig. 6, c.s.) are distinctly 
nucleated and contain each a very large number of cnida. 
They get much smaller at the upper and lower ends of the 
sac and pass gradually into the ordinary ectoderm cells on 
the one hand and the cubical or low columnar cells of the 
connecting duct on the other. 
The cnida are of elongated fusiform shape and are 
slightly curved* (fig. 7). None were seen in the exploded 
state. At the junction of the connecting tube with the 
apex of the hepatic ceecum the cubical epithelium passes 
gradually into the glandular hepatic cells, and there appears 
to be no distinct sphincter present. Figure 5 shows the 
very narrow opening of the hepatic caecum into the lateral 
branch of the liver (/.l.) leading to the posterior end of 
the stomach. 
Facelina (Acanthopsole) drummondi, Thompson. 
A number of specimens were found at Hilbre Island 
on September 9th, 1889, at extreme low water. 
The remarkably long curved connecting duct between 
the cnidophorous sac and the hepatic ceecum in this species 
is shown in Pl. IX. fig. 8, ed. Pl. IX. fig. 9 shows the 
*These are evidently the forms described by Vayssiere as the reniform 
nematocysts (Ann. du Mus. d’Hist. Nat. de Marseille, Zool. t. iti., Mém. 4, 
p- 40, 1888); we have not found the second kind described as oviform. 
Bergh, in his recently published admirable account of the Cladohepatic 
Nudibranchs (Zoolog. Jahrbiich., Bd. v. 1890), seems to consider it still 
doubtful whether more than the one kind of cnida is really produced in the 
enidophorous sac, but Vayssiere’s figures show very distinctly, in the case of 
Coryphella landsburgi at least, unbroken cnidocysts containing two distinct 
kinds of cnida, large reniform and small pyriform. 
