1883.] Zeblogy. 427 
LIMAX MAXIMUS IN CENTRAL MAssacuuseEtTTs.—In the February 
number of the NATURALIST, I see some interesting notes in Limax 
maximus L. Springfield, Mass., must be added to the localities 
there given. You will find a note by me in Vol. 11. of Science, 
page 278, giving an account of a specimen found in the city 
aqueduct— F. H. Pillsbury. 
TULLBERG ON THE STRUCTURE OF THE SHELL OF CRUSTACEA AND 
Mottusks.-—This is an elaborate treatise on the structure and mode 
of growth of the lobster’s shell, and of the shells of the mussels 
Mytilus, Modiolus, the pearl mussel and the oyster, as well as 
chitinous parts and epidermis, Dr. Tullberg then extended his 
examination to the shell-structure itself. The treatise is exhaus- 
tive, and the twelve plates are carefully drawn. It was published 
in German at Stockholm in 1882, in the Transactions of the Royal 
Swedish Academy. It is too lengthy for abstract. 
Wricut’s American Parasitic CopepopA—This brochure, with 
two plates, is the first of a series of notes on the parasites of some of 
our fresh water fishes which appears in the Proceedings of the 
Canadian Institute, Vol. 1, No. 3. The new forms are described 
and figured in detail. Several European forms are identified. 
SUPPOSED ORIGIN OF THE SPECIES OF OCYPODA FROM THE BONIN 
to be wanting in the very young of O. ceratophihalma, to vary 
greatly with the size of the individual, and to be subject to much 
iidividual and sexual variation. The form, figured by Mr. Ishi- 
nae with very long ocular stylets, is the adult of this species, 
and those with shorter stylets are apparently young individuals of 
ages, 
Ps Species of Ocypoda and their variations have been recently 
erua by De Man, Kingsley and Miers, and familiarity with 
-1 Papers, or any well directed attempt to discover real specific 
