THE ANATOMY OF AN AUSTRALIAN LAND PLANARIAN. 91 
DESCRIPTION OF PLATES. 
PLATE 7. 
Fig. 1.—hiving specimen of Geoplana spencer: lying almost still. Nat. size. 
Fig. 2.—Living specimen actively crawling. Nat. size. (The animal is represented 
slightly twisted, so as to show the blue colour of the ventral surface.) 
Fig. 38.—Specimen after preservation for a few days in alcohol, ventral surface. 
ph. pharynx; g.a. genital aperture. x2. (The colour is somewhat altered already by 
the action of the spirit.) : i 
Fig. 4.—Transverse section through the region of the posterior prolongation 
of the peripharyngeal cavity (compare Fies. 8 and 9). ef. epidermis; 1. s. nerve 
sheath ; s. z. special zone of rod-like bodies; s/. g. slime glands; al. c. alimentary 
canal; 7. c. nerve cords; t¢.c. transverse commissure between nerve cords; f. testis; 
v. d. vas deferens ; od. oviduct; p. ph. peripharyngeal cavity. 
Fie. 5.—Group of three ciliated epidermic cells from the ventral surface of a 
specimen killed with osmic acid, stamed with borax carmine and cut by the paraffin 
method. 2. nucleus; cz. cilia. Drawn under Zeiss F. oc. 2. 
Fig. 6.—Epidermis from dorsal surface of same section. Zeiss F. oc. 2. 
ep. c. epidermic cell; m. nucleus; 7. rod-like bodies; mu. mass of hardened 
mucous. 
Fie. 7.—Epidermis from peripharyngeal cavity (compare Figs. 8 and 9), 
showing the sudden transition from ciliated to glandular cells. Zeiss I. oc. 2, 
g. c. glandular cells; ci. ¢. ciliated epidermis; x. junction between the two; 1. 
nucleus. 
Fig. 8.—Diagrammatic longitudinal section through the region of the pharynx, 
the pharynx being protruded. ai. c. alimentary canal; i. true mouth ; pi. pharynx ; 
p. ph. peripharyngeal cavity. The black outline from a to 0, and from c to d, 
represents the extent of the glandular epidermis. 
Fig. 9.—Similar section with the pharynx retracted. ¢. m. external mouth or 
opening of peripharyngeal chamber ; other lettering as in figure 8. 
