196 Mrs. Sheppard on 
Lymnza. 
« Shell oblong, often turrited, generally thin; spire proe 
jecting, aperture entire, longitudinal ; margin sharp 5 colu- 
mella twisted obliquely, with the lip passing over it, forming 
a very oblique fold.” 
These animals inhabit swampy ground or fresh water. 
Lymnea stagnalis. ‘¢ Shell acute, ovate, ventricose, thin, 
transparent, longitudinally substriated, reddish gray ; last 
whorl subangalar above ; spire subulate ; aperture Jarge ; lip 
broad.” Found abundantly at Sorel, ‘The spire is often 
black and very long ; lower part of the shell generally horn 
coloured. 
Lymnea palustris. ‘‘ Shell ovate, oblong, longitudinally, 
and finely striated ; spire conical, rather acute, aperture 
ovate.” 
Found in ponds formed by the melted snow in the spring» 
near Tower No. 1. This shell is not so large or thin as stage 
nalis ; it is generally ash coloured. 
Pertsrom1ANA, Fourth Family, 
Paludina. 
«€ Shell conoidal, whorls rounded or convex, modifying the 
spiral cavity ; aperture longitudinal, angular at the summit ; 
the two margins united, acute, never turned out.” Some of 
these animals inhabit the sea or mouths of rivers, but the 
greater part live in fresh water. ‘There are two species here, 
neither of them, [ think, deseribed by De Lamarck: they 
are both small shells. 
Paludina—————? Shell white ; epidermis olive ; spire the 
length of the aperture ; last whorl inflated. 
Inhabits the Island of Orleans. 
Paludina —————? Shell pale buff ; spire longer thau the 
aperture ; top obtuse. 
Found with the foregoing on the beach at the Island; the 
whorls are not so much inflated as these of this genus gene- 
rally 
i 
