1884.] Recent Literature. 395 
publications of the leading twenty scientific men of Pennsylvania 
would secure a magnificent return in exchanges for its library. 
—— We inform interested persons, that the NATURALIST does 
not publish long obituaries ; also, that no obituary notices of sci- 
entific men of a length of a page or less, has ever been de- 
clined by its editors. 
10: 
RECENT LITERATURE. 
Ryper’s OBSERVATIONS ON EMBRYO FisHEs.!— The Bulletin 
of the United States Fish Commission contains a series of articles 
pointed in front, and the external layer becomes thicker, while the 
Pericardial membrane becomes funnel-shaped to fit the anterior 
Co Weer 's the venous end of the heart. As the peculiar amber 
- (2st around the yolk persists to the last, it is probable that the 
_ =attal clear portion is transformed gradually into it. 
1 ʻi à : 
of eae of the United States Fish Commission.—Observations on the absorption 
vestigation 00d, feeding, and development of embryo fishes, comprising some 
Pp. 179-205. conducted at the Central Hatchery, Armory Building, D.C., in 1882, 
