Posterior foliaceous appendage lanceolate, expanding laterally at the base: ears notched on their external margins.

R. Ferrum-equinum, Flem. Brit. An. p. 5. R. unihastatus, Desm. Mammal, p. 125. Horse-shoe Bat, Penn. Brit. Zool. vol. i. p. 147. pi. 14.


Length of the head and body two inches five lines; of the head eleven lines and a half; of the tail one inch two lines and a half; of the ears nine lines; breadth of the ears six lines; length of the thumb two lines and a half: extent of wing thirteen inches.


Upper incisors very small, separated from each other by a space; lower incisors each with three lobes: ears nearly as long as the head, somewhat triangular, broad at the base, terminating upwards in an acute point; the external margin notched at the base, from which point it becomes inflexed and rises into an elevated round lobe that guards the orifice of the ear and appears to act the part of the tragus, which is wanting: nostrils placed at the bottom of a cavity close to each other, surrounded by a naked membrane in the form of a horse-shoe arising from the upper lip; anterior foliaceous appendage rising vertically immediately behind the nostrils, of a somewhat pyramidal form, sinuous at the margins and at the apex, which last is obliquely truncated; the posterior one situate on the forehead, placed transversely with respect to the first and standing more erect, lanceolate, expanding laterally at the base, in front of which are two small cup-shaped cavities formed by a duplicature of the skin. Colour of the fur reddish ash, inclining to gray beneath: membranes dusky: ears within and without slightly hairy.

A local species, inhabiting caves and buildings. Found in Bristol and Rochester Cathedrals, Dartford Powder Mills, and in some other parts of the country.