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BASH FORD DEAN. 



M 



d 



FlGS. 2-7. Characteristic stages in the development of Chimara. These are shown 

 in the opened egg-capsules and represent (2) late blastula, (3) gastrula, (4, 5) two 

 stages of early, embryos, (6) a late embryo, and (7) a young fish about to escape from 

 the capsule. The retarded segmentation of the egg is indicated in Figs. 2-5, but 

 in the three earlier stages the cleavage lines cannot be seen through the wall of the 

 egg-capsule (as has been indicated diagrammatically). 



