54 
TESTACELLID^. 
Faure Biguet, who first discovered the animal, 
called it Testacellus ; Draparnaud and Cuvier have 
changed the name to Testacella, 
The animals, according to the observations of M. 
Ferussac, have a peculiar mantle (or rather ap- 
pendage of the mantle), which is simply gelatinous, 
contractile, and habitually hidden under the shell, 
divided into several lobes, and susceptible of an 
extraordinary development, so as to envelope the 
whole of the contracted body of the animal, and 
thus protect it from extreme drought. 
The animals live for the greater part of their life 
in holes under ground, only coming to the surface 
to change their locality ; and they remain buried 
during the cold or very dry weather. It is this 
power of protecting themselves from the effect of 
sudden changes of tempjerature, there is little doubt, 
that has allowed them to adapt themselves with such 
facility to our climate. 
They deposit their eggs under ground ; these are 
oblong, large and covered with a thick elastic coat, 
and burst when put into a warm place. 
12 . 1. Testacellus haliotideus. Ear-shaped Tes- 
tacelle. — Shell roundish-oval, with the outer lip 
dilated, and the pillar fiat and broad, and scarcely 
reflected outwardly. The lateral grooves of the 
body close together in the front of the shell. 
Tongue with 20 longitudinal series of teeth, (t. 3. 
fig. 19, 20.) 
Testacellus haliotideus. Faure^ Big, BuL Soc. Phil. 1802, 98.; 
Ferussac.^ Hist. t. 8. f. 5. 9, ; Sowerhy.^ Gen. f. 1, 2. ; Moq. 
