DEVELOPMENT OF THE OPOSSUM 43 
Fig. 4. A and B, two views of egg No. 306 (1); C and D, two views of egg 
No. 306 (2); in both cases both cells are in mitosis and the lines run through the 
ends of the spindles (compare fig. 2, pl. 15, and fig. 4, pl. 3). Ev and F, two views 
of egg No. 203 (8) (compare fig. 1, pl. 15). G and H, two views of egg No. 203 
(4) (compare fig. 7, pl. 13). I, No. 203 (13); one blastomere only has given off 
a large amount of yolk. J, egg No. 203 (11). K, egg No. 306 (3) (compare fig. 
A, pl. 15). L, egg No. 173 (8) (compare fig. 3, pl. 15). M, egg No. 203 (3). N, 
No. 81 (6). O, No. 299 (7) (compare fig. 13, pl. 15). P, No. 46 (7). I, J, and P, 
drawn from total preparations; all others from wax models. 
