Black above; scarcely paler beneath; throat brownish ash : tail quadrangular at the base, flattened at the extremity, and, as well as the feet, ciliated.
Length of the head and body three inches two lines; of the head one inch ; of the ears two lines; of the tail two inches one line ; of the fore foot five lines; of the hind foot eight lines and a half.
Body more thick and bulky for its length than in the last species: snout broad, and rather obtuse: feet and tail ciliated; the latter distinctly quadrangular for two-thirds of its length, compressed towards the tip, where the hairs of the cilium become longer. Colour darker, and more uniform than that of the S. fodiens; all the upper parts, sides of the abdomen, and region of the pubes, black; throat, breast, and middle of the abdomen, dusky ash, with a faint tinge of yellowish; sometimes, but not always, a white spot on the ears; incisors ferruginous at their extremities; feet and tail dusky gray, the latter with the cilium of hairs underneath of the same colour as above. Weight three drachms fifty-one grains.
This species, which has been taken in Norfolk, Cambridgeshire, and Surrey, as well as in Scotland, appears to be identical with a foreign one in the British Museum, ticketed S. remifer: nevertheless I feel some doubts as to its being the species originally described by Geoffroy under that name. It however approaches more nearly to it than to any other I am acquainted with. My specimen was taken in a corn-field at some distance from any water. The others have occurred in ditches. The ciliated feet and tail evidently mark it to be of aquatic habits.