“aceon RS 
THE ANATOMY OF AN AUSTRALIAN LAND PLANARIAN. 95 
Figs. 40-42.—Three longitudinal, horizontal sections of the ovary, to show the 
way in which the oviduct opens into it. (The sections are arranged in proper order, 
commencing at the most dorsal. Histological details are given in figure 42 only.) 
Zeiss D. oc. 2. ov. ovary; od. oviduct. 
Fie. 43.—Longitudinal vertical section through the copulatory organs, slightly 
diagrammatic. (Compare Fig. 32.) The darker tint shows the extent of the 
muscular tissue. g. a. genital aperture; p. penis; d. sections of convoluted duct in 
penis; wu. uterus; vag. vagina; odd. point of union of the two oviducts; a. small 
dilated chamber into which the united oviducts open, and which opens in its turn by 
a narrow duct into the posterior part of the uterus. 
Fig. 44.—Portion of lining epithelium of ovary, from the cells of which the ova 
are developed. Zeiss F. oc. 2. x. nucleus; f. g. small food granule already deposited 
in one of the cells. 
Fig. 45.—Young ovum in the ameeboid stage, with one long, spindle-shaped 
(nutrient) cell adherent. Zeiss F. oc. 2. 2. nucleus; /. g. food granules; sp. c. 
spindle-shaped cell. 
Fig. 46.—Older ovum, showing four adherent spindle-shaped cells. Zeiss F. 
oc. 2. Lettering as before. 
Fig. 47.—A developing ovum with reticulate nucleus (7.) and one very large food 
granule (f. g). Zeiss F. oc. 2. 
Fig. 48.—Further stage in development. Zeiss F. oc. 2. 
Fig. 49.—Mature ovum as found in the central part of the ovary. (Compare Fig. 
42.) The nucleus (7.) has assumed its characteristic transparent, swollen appearance 
(already shown in Fig. 46), and several large food granules (f/f. g.) are present. 
Zeiss F. oc. 2. 
