LIMNEA Icmgiscata. 
TAB. CCCXLI1I. 
Spec. Char. Elongated, smooth ; aperture o~ 
vate, elongated, two-fifths the length of the 
shell ; plait upon the columella obscure. 
Syn. Limneus longiscatus ? Brongniart Me - 
moire sur des Terrains formes sous l ean douce , 
p. 10. t. I. f. 9. Annales du 31 us. tom . 15. 
1. 22, f. 9. 
A shell rendered conspicuous by the length of its 
spire, and the broad obtuse edge of the columella which 
hardly rises in the form of a plait. The volutions are 
not inflated in general, but in many specimens the upper 
ones are a little so at their lower parts, so as to project 
over the following turns ; the aperture is nearly twice as 
long as wide, its inner np is a little relieved ; the sur- 
face is regular and shining, with the lines of growth 
finely marked. 
This seems to have a wider and shorter aperture than 
the figure given by Brongniart of his Li mneus longiscatus^ 
but as it is liable to some variation 1 have ventured to 
refer it to that species, although 1 have not seen authen- 
tic specimens for comparison ; should a difference really 
exist, it may distinguish the species of the upper from 
the lower fresh water formations : Brongniart found his 
shell only in the lower ; the one figured is from the up- 
per ; it was collected by Mr. G. B. Sowerby upon Headon 
Hill last year. 
