Report U. S. F. C. 1 897. (To face page 1 36.) 



Plate 38. 



H and I. Two views of an egg after the blastoderm has spread considerably and the embryonic area e is 

 well defined. 



A'. View of uuhatehed embryo, which developed in a temperature of 45° F.. producing distortions of tail 

 and notochord. 



L. An egg-envelope with its contained embryo, fortv-four hours after impregnation, viewed as a trans- 

 parent object. 



M. \n effg-envelope with its contained embryo at the beginning of the third dav of development. From 

 a photograph. 



i\. Anterior portion of a young fish on fourth day. To show relations of liver X to yelk F, over which 

 the portal vessel pv passes forward to empty into the venous sinus, in common with the anterior and 

 posterior .iugularsj' and J, ha bulbus aortse. re ventrii le. 



O. View of fore part of a young fish 17 days old, from ventral side. 



