94 THE ANATOMY OF AN AUSTRALIAN LAND PLANARIAN. 
Fig. 28.—Small portion of a horizontal section through the region marked 
x in figure 15, only from the ventral surface. Zeiss I. oc. 2. m. f. irregularly 
arranged bands of muscle fibres ; 7. transverse section of a nerve. 
Fig. 29.—Portion of vertical section through the extreme outside of the pharynx ; 
showing the cilia of the epidermic cells, the masses of mucous beneath the epidermis, 
and the rod-like masses of mucous lying in the epidermis itself and completely 
obscuring the cells of which it is composed. cz. cilia; mu. masses of hardened 
mucous. 
Puate 10. 
Fig. 30.—Longitudinal section of testis, showing the central mass of spermatozoa. 
in various stages of development, separated by a cavity, probably chiefly due to 
shrinkage, from the lining epithelium of mother cells. At x the central mass of 
spermatozoa is connected by a short neck with a branch of the vas deferens, which 
is not shown in this figure. m.c. mother cells of the spermatozoa ; c. m. central mass 
of developing spermatozoa. 
Fig. 31.—Part of vas deferens, with branches to the testes, as seen in 
horizontal section. Zeiss D. oc. 2 (compare Fig. 4, v. d.). v. d. vas deferens ; ¢. 0d. 
branches to testes ; 2. nuclei of epithelial cells lming the vas deferens. 
Fig. 32.—Male and female muscular copulatory organs, dissected out from the 
ventral surface (compare Fig. 43). fe. female; ma. male; g.a. genital aperture. 
Fig. 33.—Portion of lining epithelium of uterus, showing the ciliated projections. 
Geiss Immersion 2.0 mm. oc. 4.45 mm. cz. cilia; 7. nuclei. 
Fig. 34.—Part of yolk gland, showing its connection with a branch (yolk duct) 
of the oviduct. Zeiss D. oc. 2. ylk. yolk gland; ylk. d. yolk duct; od. oviduct; 
ep. columnar ciliated epithelium of oviduct; 7. m. investing membrane of oviduct. 
Fig. 35.—Two yolk gland cells, showing the enormous size of the nucleus (7.). 
Zeiss F’. oc. 2. 
Fig. 36.—Mother cells of spermatozoa from epithelial lining of testis. Zeiss I’. 
oc. 2. m. nucleus. 
Figs. 37-39.—Three stages in the development of the spermatozoa, from the 
central mass of testis, 
