80 



ogy, Johns Hopkins University. 8 vo.. pp. 81, pis. X. 

 (In Keport of Commissioners of Fisheries of Maryland, 

 1880.) 



The same, published as Contribution Xo. IV. of Ches- 

 apeake Zoological Laboratory, Johns Hopkins Tniver- 

 sity, ( a reprint of the j^receding) with a paper added, en- 

 titled : The Acquisition and Loss of a Food-Yolk in 

 MoUuscan-Eggs. 8 vo., pp. 107 — 116, pi. XL John Mur- 

 phy &Co., Baltimore, 1880. 



