112 
Fig. 
LIVERPOOL BIOLOGICAL SOCIETY. 
EXPLANATION OF PLATE XII. 
Artery. mes. Mesodermal tissue. 
Aperture on apex of =. Nerve in cerata. 
papilla. o.t. Ovo-testis. 
Blood corpuscles. p- Passage from hepatic 
Ceratal blood sinus. cecum to cnido- 
. Dorso-lateral vein. phorous sac. 
Foot. r.c. Renal chamber. 
Foot glands. rh. Bhinophore. 
Hepatic cecum. S. Cnidophorous sac. 
Liver. te Thread cells (enida). 
Muscle bands. 1,2,3. Cerata or dorsal pa- 
pille. 
ig. 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 
Eolis. 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 czeca to 
the ceratal and lateral blood sinuses. 
