given in imitation of the sound. Where this animal is
abundant, it may be heard at all times of the day, and sometimes
directly beneath one's feet. When kept in a room, the
tucutucos move both slowly and clumsily, which appears
owing to the outward action of their hind legs; and they are
quite incapable, from the socket of the thigh-bone not having
a certain ligament, of jumping even the smallest vertical
height. They are very stupid in making any attempt to
escape; when angry or frightened they utter the tucutuco.
Of those I kept alive several, even the first day, became
quite tame, not attempting to bite or to run away; others
were a little wilder.

The man who caught them asserted that very many are
invariably found blind. A specimen which I preserved in
spirits was in this state; Mr. Reid considers it to be the
effect of inflammation in the nictitating membrane. When the
animal was alive I placed my finger within half an inch of
its head, and not the slightest notice was taken: it made its
way, however, about the room nearly as well as the others.
Considering the strictly subterranean habits of the tucutuco,
the blindness, though so common, cannot be a very serious
evil; yet it appears strange that any animal should possess
an organ frequently subject to be injured. Lamarck would
have been delighted with this fact, had he known it, when
speculating [7] (probably with more truth than usual with him)
on the gradually _acquired_ blindness of the Asphalax, a
Gnawer living under ground, and of the Proteus, a reptile
living in dark caverns filled with water; in both of which
animals the eye is in an almost rudimentary state, and is