716 American Work in the Department of [September, 
lishes in the January number of Fahrbuch d. Deutschen Mal. Ges. 
f. 1881 an account of his collections. Herein appear descriptions 
of several forms of ABuccinum, which no one of our American 
students has yet thought of separating under a specific name, 
though very familiar to all. The limitations of species varying 
with different writers, it is sufficient to say that in this case specific 
limits seem to be contracted beyond precedent. None of the 
forms are figured and described but have been already several 
times named, according to the average view of such things. 
The figures are fortunately very good. 
Lntroduced Species—W. H. Ballou (American NATURALIST, 
July, p. 523) states that Bythinia tentaculata L., was discovered at 
Oswego, N. Y., in June, 1879, and has more recently been found 
in the Champlain canal, at Waterford and Troy, and in the Erie 
canal, at Syracuse, N. Y. 
Verrill (Proc. U. S. Nat. Mus., m1, p. 376) notes the occurrence 
at Newport, R.I., among the ducks, of Zruncatella truncatula 
Drap., with Alexia myosotis, Assiminea grayana, etc., in July. 
Professor E. S. Morse, in the Bulletin of the Essex Institute 
(Vol. xu, 1880, Salem, Mass.), has a paper of six pages on “ The 
gradual dispersion of certain mollusks in New England.” Init 
some statistics are given as to the gradual spread of various spe- 
cies, especially Litorina litorea L., together with a small map and 
a figure of the shell. 
In the American Fournal of Science among the zoological 
notes, Professor Verrill alludes briefly (1. c. p. 250, Sept., 1880) t© 
the occurrence of 7runcatella truncatula and Assiminea grayants 
at Newport, R. I. (The recorder believes that in 1871, during ss 
brief visit to Wood’s Holl, Mass., he obtained a few dead spect 
mens of the former on the beach at that place; at least the spect 
mens agreed with European specimens so named, so far as the 
shell was concerned.) } 
Another note (I. c. p. 2 51) refers to the rapid diffusion of Lito- 
vina litorea L., on our coast, this species having now reached as 
far south-west as New Haven, Conn. 
In the Valley Naturalist (St. Louis) u1, 1, Sept., 1880, Mr. L. B. 
Case speaks of the prevalence of Zonites cellarius Miall., in ore 
houses, where, however, it is not ascertained to do any damage 
unlike an unidentified imported species of Limax, which 's wake 
destructive to Begonias and other tender-leaved foliage plant 
