242 THE ZOOLOGIST. 
The Wild Duck and Teal have both been winter visitors. 
About eighty species of birds, according to my observations, 
up to a few years ago frequented these open spaces, and there 
were probably more; they have no doubt diminished, owing 
particularly to the erection of the rifle-butts. Should the railroad 
now be made, farewell to those ‘‘ feathered songsters’’— 
‘““No more the mounting larks * * * 
Shall, list’ning in mid air, suspend their wings.” 
THE LAND AND FRESH-WATER SHELLS OF THE 
NEIGHBOURHOOD OF YORK.* 
By Rogperr Miniter Curisty. 
Il TERRESTRIAL MOLLUSCA. 
UNIVALVES (GASTEROPODA). 
Fam. Limacip2:. 
Arion ater.—Of course very abundant, and is to be found 
almost everywhere. I haye seen them crawling over tussocks 
of grass on the wettest parts of Strensall Common. It 
appears to be largely carnivorous and subject to variety. A 
couple of reddish ones were found beneath a putrefying bird 
in Overton Wood, and I have seen two of a yellow colour with 
blue tentacles. 
Arion hortensis.—This small slug is found abundantly beneath 
logs of wood. I have often found it abroad much later than its 
relatives. Like many other mollusks, it is particularly fond of 
devouring damp paper. 
Limax agrestis.—Abounds to any extent, and comes out in 
mild weather throughout the winter. 
Limax maximus.—Common beneath logs of wood and loose 
stones. I have often found them with the mantle covered with 
spots, but with only a very few on the rest of the body, 
Further search would certainly reveal other of the Limaces, 
but these are all I have found. 
* Concluded from p. 185. 
