KoFoiD. — Development of Limax. 



I 



PLATE III. 



All figures magnified 490 diameters. 



Fig. 20. Eight-cell stage from the anterior end. Cleavage cavity and lenticular 

 spaces present. Spindles of the fifth generation. 



Fig. 21. View of the same egg from the animal pole. 



Fig. 22. Sixteen-cell stage viewed somewhat obliquely from the right anterior 

 quadrant, composed of the following cells: a^'^-d^'^; a^'^-d^''^; 

 a^-3-c?°'3; and a^'^-d^-*. Cleavage cavity present. 



Fig. 23. Lateral view of twent^'-four-cell stage. Recent division of quartets 

 resulting in 6.1, 6.2, 6.3, 6.4. Vacuolation at the animal pole. 



Fig. 24. Oblique section of same egg. Fifth section in a series of twelve. Inter- 

 cellular spaces at the animal pole. Cleavage cavity present. 

 X, longitudinal section of intercellular space. 



Fig. 25. Seventh section in same series. 



Fig. 26. Transverse section of an embryo of about one hundred cells, showing 

 vacuolated condition of all three germ layers. 



