ne 
DIVISION XI. 
Mollusques et Animaux inférieurs. 
FASCICULE I. 
de ere 
général. 
ADams (C.-B.). — Observations on some species of the marine 
shells of Massachusetts, with descriptions of five 
new species. (Boston Journ. Nat. Hist. IL.) 5 
— Descriptions of thirteen new species of New England 
Shells. (Ib. III.) » 
— Description of Tellina tenta Say, and of Helix serpu- 
loides Montagu, with remarks on other marine 
Shells of Massachusetts. (Ib. ib.) » 
AGAssIz (A.). — On Alternate Generation in Annelids, and the 
Embryology of Autolytus cornutus. (Ib. VII.) » 
— On Arachnactis brachiolata, a Species of Floating 
Actinia found at Nahant, Massachusetts. (Ib. ib.) ) 
ANTHONY (J.-G.).— Descriptions of three new species of Shells. 
(Ib. IL.) , 
— Descriptions of two new species of Anculotus. (Ib. 
ib.) Ù 
