Kofoid. — Development of Limax. 



PLATE VI. 



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



a G.8_£/6.8 ; a 6.7_^6.7 ; a 6.6_rf6.6 ; a 6-5_ rfci.5 . a 6.4 _ ^6.4 . a ti-3_ rf6.8 . a 7.4 _ 



d'-*; a7-8-rf 7 - 8 ; o 7 - 2 -d 7 - 2 ; a^-fT-i. 



Fig. 37. View from the animal pole. X 490. 



Fig. 38. View from the vegetative pole. Division of d'-' 2 about to take place. 



The first mesoderm cell (<P' 2 =M) with a large nucleus lies beneath its 

 sister cell, d 1 ' 1 , only a small portion of it (shaded very dark) coming to 

 the surface. X 490. 



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



/76-6 7,6-6 y/6-6 



a 6-8 _ rf6.8 . a 6-7 _ rfO-7 . " ° C 5.3, " . H 7-S _ J7.8 . a 7-7 _ rf7-7 ; a 6 J _ 



a 6-0 /j 0-5 rf J -° 



rfB-3; a7-4-d"-4; a 7-3-rfT.3 ; a 7.2_rf7.2 ; a M - f /7.1. 



Fig. 39. View of the animal pole. Division of 6 5-3 into U" b and 6 6-6 . 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 : — 



a 6.8_^6.8j a 6 -"-d J - 7 ; a 6 " 6 -^- 6 ; a«- 5 -c/ 3 - 5 ; a™-d™i a 7 * 7 -**™; a 6 - 3 , 



&6.8 } LL ^6.8. a 7.4_ ( ^7.4 ; rt 7.3_rf7.3. a 7.2_j,7.2j a 7.1 _ J7.1. 



Fig 41. View of the animal pole. Recent divisions resulting in a 6 * 5 , a 6,6 , and c"- 5 , 



c"-6. X 490. 

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



