92, THE ANATOMY OF AN AUSTRALIAN LAND PLANARIAN. 
Prats 8. 
Fig. 10.—Longitudinal section through the anterior end of the body, a little to 
one side of the middle line. ef. epidermis; .s. nerve sheath; s. z. special zone of 
rod-like bodies; 7. c. nerve cord; al. c. diverticula of alimentary canal; gang. 
bilobed ganglion ; e. eye. 
Fig. 11.—Section along the line x. y. in the preceding figure. d. m. layer of 
diagonal (oblique) muscles immediately beneath the epidermis; e. /. m. external 
layer of longitudinal muscles ; other lettering as in the preceding figure. 
Fig. 12.—Bilobed ganglion, more highly magnified, showing the finely granular 
eround substance and the numerous small ganglion cells, of which the nuclei alone 
are usually visible. 
Fig, 18.—Portion of a horizontal section through the two nerve cords near the 
anterior end of the body, showing the arrangement of the nervous system, which is 
coloured blue. (Compare Fig. 4.) .c. nerve cords; ¢. c. transverse commissures ; 
m. nerves running out from the main cords to the nerve sheath; 7. s. nerve sheath ; 
ep. epidermis; s. %. special zone of rod-like bodies ; ¢: testes. 
Fig. 14.—Portion of the nerve sheath from the ventral surface, as seen in 
horizontal section. Zeiss Dand Foc.2. x. f. nerve fibres, arranged so as to form more 
or less rectangular meshes; g.c. ganglion cells, occurring between the nerve fibres. 
Fie. 15.—Small portion of a longitudinal section through the anterior part of the 
animal; the section extends from above the alimentary canal to the epidermis on 
the dorsal surface of the animal. ep. epidermis; 7. rod-like bodies; imu. masses of 
hardened mucous; d.m. layer of diagonal (oblique) muscle fibres immediately beneath 
the epidermis; ¢. /. m. external layer of longitudinal muscles (compare Fig. 19) ; 
n.s. nerve sheath; g.c. ganglion cells (compare Fig. 14); rv. f. radiating muscle fibres; 
s. g. special zone of rod-like bodies; x. layer of tissue containing irregularly 
arranged muscle fibres, nuclei, and hardened rods of mucous (#.) on their way 
to the surface; y. layer contaiimg the deep muscular system; /. f. longitudinal 
fibres; c.f. circular or more or less oblique fibres seen in section; d. v. dorso- 
ventral fibres; s/. g. unicellular slime glands from which the rods of hardened 
mucous in the outer layers origmate; probably in a young stage of development 
(compare Fig. 27). 
PuatEe 9. 
Fig. 16.—Portion of the lining epithelium of the alimentary canal, from a 
specimen |illed with osmic acid, cut frozen, and stained with borax carmine before 
