Kororp. — Development of Limax, 
PLATE VII. 
Fig. 43. Young gastrula, seen from the posterior end, showing the broad shallow 
blastopore. X 300. 
Fig. 44. The same, viewed from the ventral surface. X 300. 
Figs. 45-50. Sections of gastrula stage. Mesoderm cells shaded dark. 
Fig. 45. View of the posterior face of the ninth section from the posterior end ina 
series of nineteen transverse sections, showing broad posterior portion 
of the blastopore. X 350. 
Fig. 46. View of the posterior face of the fifte 
ing the deepened anterior end of the invagination. X 350. 
Fig. 47. View of the right face (animal pole uppermost) of the eighth section in 
a series of sixteen sagittal sections through a blastula containing eighty 
cells, showing mesodermal pole cell and cleavage cavity. >< 950. 
Fig. 48. View of the left face (animal pole above) of the eighth section of a series 
of twenty sagittal sections of an early gastrula, at about the stage of 
Figure 43, showing cleavage cavity and the mesodermal strand of the 
left side. X 850. 
Fig. 49. View of the left face of the tenth section of the same series, showing at the 
right the mesodermal pole cell of the left side. X 300. 
Fig. 50. View of the left face of the eleventh section of a series of seventeen 
sagittal sections through an embryo of about the stage of Figure 43, 
showing the mesodermal strand of the left side. A. Anterior; P. Pos- 
x 350. 
enth section in the same series, show- 
terior. 
