NUDIBRANCHIATA OF THE L.M.B.C. DISTRICT. 
239 
EXPLANATION OF PLATE XII. 
a. Artery. mes. Mesodermal tissue. 
ap. Aperture on apex of nd. Nerve in cerata. 
papilla. o.t. Ovo-testis. 
b.c. Blood corpuscles. p- Passage from hepatic 
c.s. Ceratal blood sinus. cecum to cnido- 
d.l.v. Dorso-lateral vein. phorous sac. 
ie Foot. r.c. Renal chamber. 
f.g. Foot glands. rh. | Rhinophore. 
h.c. Hepatic cecum. S. Cnidophorous sac. 
ihe Liver. t Thread cells (cnida). 
m. Muscle bands. 1,2,3. Cerata or dorsal pa- 
pillee. 

Fig. 1. Dissection of Dendronotus arborescens, from the 
left side x 13, showing the cecal processes of the 
liver running towards the cerata. 
. Transverse section of the body of Dendronotus in 
the region of the second pair of cerata: that on 
the right side is cut longitudinally. Drawn from 
Swift’s 1 in. obj. 
. Transverse section of one of the third dorsal cerata 
of Dendronotus. Swift, + in. 
. Transverse section of one of the dorsal cerata of 
Holis. Swift, + in. 
. Longitudinal section of the extremity of one of 
the dorsal cerata of Holis, showing the opening of 
the cnidophorous sac to the exterior. Swift, + in. 
. A neighbouring section to the preceding one, 
- showing the communication between the cnido- 
phorous sac and the hepatic cecum. Swift, + in. 
. Diagrammatic transverse section of Dendronotus, 
_-showing the relations of the short hepatic ceca to 
the ceratal and lateral blood sinuses. 

