48 
ANNIE MATTHEWS. 
The eggs are opaque, very yolky, and reddisli-yellow in 
colour. They are about 05 mm. in diameter, and float at 
Text-figs. 1a-8. 
Fig. 1a. Sixty-four celled stage, X 46. Fig. 2. Rather late 
pre-planula, with prominent lobes, X 56. Fig. 3. Latest 
stage pre-planula ; lobes softened into shallow wrinkles ; 
seventy-two hours old, X 62. Fig. 4. Round ciliate planula 
of sinuous outline, succeeding Fig. 3. The arrow indicates 
the direction of progress, X 52. Fig. 5. Oval planula of 
smooth outline, twenty-four hours older than last figure, 
X 40. Figs. 6 and 7 show planarian-like movements of long 
thin planula, X 40. Fig. 8. Planula showing lateral ridges 
when contracted due to irritation, X 40. 
various depths in the tank as though their specific gravity is 
very near that of sea-water. After segmentation has begun 
