THE DEVELOPMENT OP THE TEMNOCEPHALEHL 439 
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[EXPLANATION OF JM^ATES 23— 25,i 
Illustrating Professor W. A. HaswelPs paper on “ The 
Ueveloptnent of the Temnocephalea3.” 
Lettering. 
br. Brain, e. Supposed endoderni primoi’diuni. en. Endocoele. cp. 
Epidermis, ep. en. Ejiithelial lining of endocoele. ex. Excretory sac or 
excretory cells, ey. Eye. o. Ovum. o. p. Oral papilla', jdi. Pharynx, 
s. Roof of endocoele, becoming septum, cutting off lumen of pharynx 
from the exterior, t. Tentacle. ;/. Yolk-cells, y'. Yolk syncytium. 
PLATE 23. 
Fig. 1. — Longitudinal section of the ovary of Temnocei^hala 
comes. X 50U. 
‘ All the figures have been re-drawn by Mr. A. C. Cronin, of the 
Water and Sewerage Department, Sydney, from my original drawings. 
