244 
Fig. 
Fig. 
Fig. 
TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
canals into the lacunar system of the body-wall. 
The scale applies to both figures. 
PuaTeE XXXVII. 
. Horizontal section of the madreporic interradius of 
a young Astervas rubens. 
A similar section from an older specimen. 
Part (peripheral) of a tranverse section of the cen- 
tral plexus of an adult Cribrella sanguinolenta. 
A ‘section similar to figs. 1 and 2 showing the 
relation of the gastric hemal strands to the 
central plexus and the gut. 
PuATH XXX VILL. 
. Diagram of the central portions of the water- 
vascular and nervous systems of Asterias rubens, 
constructed from thirteen consecutive horizontal 
sections of the disc. 
. Diagram of the central portions of the water- 
vascular and hemal systems of Asterias rubens, 
constructed from several series of sections. Com- 
pare with Fig. 1, Plate XX XIX. 
. Vertical section through the peristome of Asterias 
rubens. The scale applies to figs. 1 and 3. 
Prate XXXIX. 
. Diagram of the central portions of the water- 
vascular and hemal systems of Astervas rubens, 
constructed from ten consecutive sagittal sections 
through the madreporic interradius. 
. Transverse section of the vertical septum which 
divides the radial periheemal canals, showing four 
hemal lacune. The dotted line in the upper 
ones represents coagulum. 
Longitudinal section of the oral end of the cen- 
tral plexus of Asterias rubens. 
