Fig. 51. 
Fig. 52. 
Fig. 53. 
Fig. 56. 
Fig. 57. 
Koro, — Development of Limax. 
PLATE VIII. 
View of the ventral surface of a gastrula, showing blastopore and velar 
projections. X 850. 
View of the anterior face of the eleventh section from the anterior end in a 
series of nineteen transverse sections of an embryo of the stage of 
Figure 51, showing blastopore and velar projections. X 350. 
View of the posterior ventral surface of a gastrula somewhat more ad- 
vanced than that represented in Figure 51. 800. 
Nore. — A defect in the shading causes the floor of the median 
groove (bl’po.) to appear elevated into a ridge. ‘There is no such ridge. 
View of the left face of the seventeenth section in a series of obliquely 
sagittal sections of an embryo of the stage of Figure 53, showing cleavage 
:avity at the posterior end of embryo. X 350. 
View of the ventral surface of an embryo more advanced than that seen 
in Figure 53, showing development of the cephalic vesicle and the foot. 
x 490. 
View of the right face of the tenth section of a series of twenty-three 
obliquely sagittal sections of an embryo with blastopore in the poste- 
rior position. X 850. 
View of the anterior face of the eighth section, from the anterior end, of a 
series of sixteen transverse sections, showing archenteron, the velar 
ridge and enlarged cells (cnch.) in the region of the future shell gland. 
x 300, 
