524 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
Fig. 
TRANSACTIONS LIVERPOOL BIOLOGICAL SOCIETY. 
25. ‘Transverse section of axial sinus, central plexus, 
and water-tube, seen under simple lens. xX 8. 
26. ‘Transverse section of a radial nerve. x 80. 
27. Longitudinal section of the distal end of a tube- 
foot. X 180. 
28. Part of a sagittal section of ‘‘ Aristotle’s lan- 
tern”’ and the adjacent parts. x 55. 
Prats LY. 
29. Diagram of a transverse section of an ambu- 
lacrum, showing the relation of the radial canal 
of the water-vascular system to the tube-feet 
and their ampulle. Magnified. — 
. 80. Sagittal section of distal end of a radial nerve, 
showing the intercommunication of its fibres 
with the basal ends of ectoderm cells. > 180. 
. 381. Transverse section of the pharynx. X 20. 
. 82. Part of transverse section of oesophagus. xX 180. 
. 83. Part of sagittal section of peristome, showing a 
lateral branch of a radial canal opening directly 
into the cavity of a buccal tube-foot. > 565. 
. 84. Part of transverse section of inferior coil of 
intestine, showing numerous gland cells. x 180. 
. 85. Part of the periphery of transverse section of 
central plexus, showing the densely packed 
nuclei of connective tissue and the rounded 
cells from which lymph corpuscles are said to 
be derived. x 400. 
35. Part of cortex of transverse section of central 
plexus, showing the loose meshwork of con- 
nective tissue. xX 400. 
