184 THE ZOOLOGIST. 
hatched on the 19th June following. The young were lively and 
crawled about at once. A dwarf form abounds in deepish water 
in the Ouse (H.) A very large form, hardly distinguishable from 
L. auricularia (with reflected lip, &c.), at Middlethorp. A long- 
spired and small-mouthed form used to occur in a ditch at 
Clifton (H.) Intorted spire, very like L. involuta; one specimen 
in the Foss (H.) 
Var. ovata. —Not uncommon, I believe. 
Var. acuta. —Not uncommon. Water-tank, Bootham. 
Var. acuminata.—Abundant in the largest pond north of the 
railway at Hobmoor. In shape it is very like a small L. awricu- 
laria having the lip inflated. In mild weather they often crawl 
on the top of the duckweed, and if a breeze blows them up to one 
end of the pond they are to be obtained in great numbers. 
Var. succineeformis.—A small, fragile form in a pond at 
Askham, I think, answers to this. 
Limnea auricularia.—Occurs rarely in the Ouse, and used to 
do so more abundantly in the Foss than at present. <A few years 
ago, when the water was let out, it was to be found in great 
numbers, and often very fine; indeed Mr. Wakefield, the late 
curator of the museum, once showed me some from here far 
larger than any I have ever seen from elsewhere. 
Var. acuta.—Pretty common in the Foss, and also very fine at 
times. 
Limnea stagnalis.— Quite a rarity, compared with its abundance 
in some districts. It is, however, common in one pond and some 
of the ditches at Askham, but it never attains a large size there, 
and its shell is mostly much corroded. Common in one or 
two ponds at Hobmoor, a few in the Foss, and in a ditch near 
Strensall, and abundant in a pond on the Common itself. It 
yaries much in shape, those from the last locality having very 
short spires. 
Limnea palustris.— Rather well distributed ; in a ditch behind 
the Foss near Huntington, in one pond and many of the ditches 
at Askham Bog, common. 
Limnea truncatula.—Abundant with, I think, several of its 
varieties. Puddles in Skelton Lane, &c. (H.) Ditches by Bishop- 
thorpe, on Clifton Jugs, by Acomb Wood, Walmgate Stray, &c. 
It is semi-amphibious, and if the tiny ditches it frequents happen 
to dry up, the consequences are in no way serious to it. 
—_ 
