Report U. S. F. C. 1897. (To face page 136.) 



Plate 37. 



^smatfflnTvSs'^^ *'°'^''^"^'' '^*'"'"^' "^ ""'''^P'^ "^"*'"1^ ^^"'^kled and its surface covered with 



C ShowsTl?el^,'4?l!f..1 '■'^''""^ f"/^ distended egg-membrane, natural size. 



Z>^^;; " ' Y^- -^ prominence ex- 



E. ^i::^:^ur'r:^;r^:z^u!!;:^^^^ - photograph. 



outward of pectoral r.l as whi^ VrX^tVZ^}^'' course of segmental ducts «/ and extension 



F. Si.ie %iew of a vount s'l^ / is nv/ concerned m the development of pectoral fins, 

 bladder: />. liver :^rr gal l^hladd^ ohl, viewed as a transparent object.' ab, rudiAientary air- 



G. An embrj-o in its envelope, on the third day of development, nearly ready to hatch. 



