746 



GORHAM. 



EXPLANATION OF PLATE XXXVIL 



In all the figures the red line represents the first cleavage-furrow, the blue line 

 the second, the green line the third, the broken black line the fourth, the continuous 

 black line the fifth, and the dotted black line the sixth. The red nuclei ultimately 

 invaginate. 



Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Type I. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 

 Fig. 



i-2-cell egg, spindle in major axis. 



i-2-cell egg, spindle inclined to major axis. 



i-2-cell egg, spindle nearly in minor axis. 



2-4-cell egg, first and second cleavage-planes appearing simultaneously. 



2-4-cell egg, spindles parallel. 



2-4-cell egg, spindles perpendicular. Type III. 



2-4-cell egg, spindles parallel and " cross-furrows " perpendicular. 



8. 2-4-cell egg, spindles parallel and "cross-furrows" parallel. Type II. 



9 a. 2-4-cell egg. Type I. 



9 b. Opposite side of same egg. 



oa. 2-4-cell egg. Type II. 



o b. Opposite side of same egg. 



I. 2-4-cell egg. Type III. 



2 a. 4-8-cell egg. Type I. 



2 b. Side view of same egg. 



2 c. Opposite side of same egg. 



3 a. 4-8-cell egg. Type II. 

 3 b. Side view of same egg. 



3 c. Opposite side of same egg. 

 4. 4-8-cell egg. Type III. 

 5«. 8-i6-cell egg. Type I. 



5 b. Opposite side of same egg. 

 da. 8-i6-cell egg. Type II. 



6 b. Opposite side of same egg. 



7. 8-i6-cell egg. Type III. 



8. 32-64-cell egg, Type I, showing four cells which invaginate. 



9. 32-64-cell egg, Type II, showing four cells which invaginate. 

 20. 32-64-cell egg. Type III, showing four cells which invaginate. 



