KoFOiD. — Development of Limax. 



PLATE VI. 



Figs. 37, 38. Forty-cell stage, composed of the following cells : — 



aG.8_(/o.8; a^-'-d^-^; aS-B-cf^.s. a'^^-5 _ d'j-^ ; a*^-^ - d^-* ; a^-S-d^-s ■ a'-*- 

 (f7-4. „7.3_J7.3. a"-^-£?'-2; a'-^-d'-\ 



Fig. o7. View from the animal pole. X 490. 



Fig. 38. View from the vegetative pole. Division of d~^-- about to take place. 



The first mesoderm cell (d'"'^ — M) with a large nucleus lies beneath its 

 sister cell, d'''^, only a small portion of it (sliaded very dark) coming to 

 the surface. X 490. 



Figs. 39, 40. Forty-two-cell stage, composed of the following cells : — 



^6.6 56-6 (f6.3 





rfe-3; a'-i-rf"-^; a1-^-d?-^; a^ -^ - d' -'^ ; al-i-J'-i. 

 Fig. 39. View of the animal pole. Division of b^'^ into V'-^ and W'^. Vacuolation 



at animal pole. X 490. 

 Fig. 40. View of the vegetative pole of the same egg. X 490. 

 Figs. 41, 42. Forty-five-cell stage, composed of the following cells : — 



a6.8_c;6.8j a^---d^-'; a^-e - rfJ-e . a«-5-c?^-5; u'-^-d'-^; a'-'-d^'; a^-s, 



J6.3^ £_^_ (f;.3 . a7.4_^7.4; flT.S _ (/T-S . rt7.2_p7.2. a'-l - (^"'l. 



Fig 41. View of the animal pole. Recent divisions resulting in a^'^, a^'^, and c'-^, 



c'\ X 490. 

 Fig. 42. View of the vegetative pole of the same egg. X 490. 



