34 THE VIVARIUM. 
near relatives the Club Mosses, or Snake Mosses, as they are 
sometimes called, e.g., Lycopodium selago, the Fir Club Moss; 
Lycopodium clavatum, the Common Clib Moss; Lycopodium 
alpinum, the Alpine Club Moss; and the lke. A few of our 
beautiful Mosses will grow well in a Fern-case, if carefully 
managed, for example, Funaria hygrometrica, Tortula muralis, 
Sphagnum cymbifolium, and S. acutifolium. 
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Fic. 22.—TODEA SUPERBA. 
In some Vivaria, which ought to be kept, because of the animals 
they contain, in a drier condition than an ordinary Fern-case 
should be, certain of the Houseleek family will be useful, of which 
the following may be mentioned: Sempervivum anomalum, S. 
arachnoideum, S. arenarium, S. caleareum, S. ciliatum, and S. 
tectorum. The same may be said of the beautiful Saxifrages : 
Saxifraga imerustata, S. pyramidalis, S. aquatica, S. umbrosa 
