THE NAUTILUS. 9 



ON THE OCCURRENCE OF ARION FASCIATUS, NILS. IN AMERICA. 



BY WALTER E. COLLINGE, F. Z. S., 



Mason University College, Birmingham, England. 



Whilst in Washington, D. C, a friend of mine collected for me a 

 few slugs from a garden, amongst which I was surprised to find a 

 single specimen of Arion fasciatus Nils. The specimen measured (in 

 alcohol) 26 mill., and is of a hrown color with darker lateral bands 

 which are continued to the anterior border of the mantle; t lie foot- 

 sole is almost white and there is a faint keel ; it approaches very 

 closely the var. neustriacus Mabille. Adult keeled forms of this 

 variety are very uncommon in the British Isles, and from tliis fact I 

 assumed that this individual had probably been introduced from 

 Europe. My friend has since ascertained that such is very likely the 

 case, as he has learned that a previous owner of the garden was in 

 the habit of importing plants which were usually packed in moss. 



A. fasciatus is easily distinguished from A. hortensis Fer., by its 

 white foot-sole, and from the majority of the species of this genus by 

 the peculiar form of the receptaculum seminis, which instead of being 

 pyriform or oval in shape, is elongated, terminating in a long pointed 

 apex. 



PISIDIA NEW TO OUR COUNTRY, AND NEW SPECIES. 



BY DR. V. STERKI. 



It has been considered almost an axiom that the American Pisidia 

 lie eo ipso distinct from those of the eastern continent. But last year, 

 the efforts of several conchologists have brought to light a number of 

 species which are identical with European forms. 



1. In Lake Ontario, on the New York shore, by Mr. Frank C. 

 Baker; in the Hamilton Bay, Ontario, by Mr. James Johnston, a 

 Pisidium has been collected which is absolutely identical with a form 

 from England received as amnicum Mull., and, as it seems, not dis- 

 tinct from one of France, under the same name. Mr. Clessin, to 

 whom a few specimens were submitted, thinks it not exactly amni- 

 cum. Considering the great variability of most Pisidia, these forms 

 must be studied further. 



2. Pis. henslowianum Shep. has also been collected in Hamilton 

 Bay, Lake Ontario, by Mr. James Johnston ; a number of good 

 specimens. 



