But there are other cases of encysted or immured animals
which, though less striking as regards the length of time during which
torpidity has been observed, are much more closely analogous to the real
or mythical conditions of the toad-in-a-hole. That curious West African
mud-fish, the Lepidosiren (familiar to all readers of evolutionary
literature as one of the most singular existing links between fish and
amphibians), lives among the shallow pools and broads of the Gambia,
which are dried up during the greater part of the tropical summer. To
provide against this annual contingency, the mud-fish retires into the
soft clay at the bottom of the pools, where it forms itself a sort of
nest, and there hibernates, or rather aestivates, for months together, in
a torpid condition. The surrounding mud then hardens into a dry ball;
and these balls are dug out of the soil of the rice-fields by the
natives, with the fish inside them, by which means many specimens of
lepidosiren have been sent alive to Europe, embedded in their natural
covering. Here the strange fish is chiefly prized as a zoological
curiosity for aquariums, because of its possessing gills and lungs
together, to fit it for its double existence; but the unsophisticated
West Africans grub it up on their own account as a delicacy, regardless
of its claims to scientific consideration as the earliest known ancestor
of all existing terrestrial animals. Now, the torpid state of the
mud-fish in his hardened ball of clay closely resembles the real or
supposed condition of the toad-in-a-hole; but with one important
exception.
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