1880. ] : Zoology. 807 
attention to this interesting species this summer, but although the 
animals are very abundant I have been baffled in all my attempts 
to find the eggs or young until within the last week, but have 
it hatch I should certainly have supposed it to be a Copepod 
embryo, as the resemblance is perfect. 
In this connection I may state that Mr. Wilson has succeeded 
in raising zoéas from the eggs of Libinia, and of a closely-allied 
genus. In these, the most highly specialized of the Decapods, the 
embryonic record is accelerated so much that the zoéa has its full 
number of thoracic appendages when it leaves the egg, so the 
embryology of Leucifer is at one end of the series and the em- 
bryology of Libinia at the other. : 
Wilson has also raised the zoéas of the following crabs from 
the egg, this summer: Porcellana, Pinnixa, Sesarma, Pinnotheres, 
Callinectes, : 
The skin which the crab zoéa sheds soon after it leaves the egg 
has been regarded as a Nauplius skin, but the fact that the Naup- 
