354 SUPPLEMENT 
appear that the proboscis, or more probably the labrum, is, 
as it were, laciniated, or divided into little tongues swelled 
at the extremity, a disposition, which if true, is exceedingly 
anomalous. We also learn from Bianchi, that this molluscous 
animal suffers to escape from its body a great quantity of fluid 
which stains the fingers, and paper, of a fine purple colour, 
which suggested to him the idea that this might be one of 
the conchyliferous mollusca, which furnished to the ancients 
the purple with which they tinted the most precious stuffs. 
Linnzus, and some other writers, have adopted this opinion. 
The scalariz, like the turbines, appear to prefer the sea- 
coasts, where there are numerous anfractuosities and rocks. 
It is probable that some of them are to be found in all seas. 
In the animals of the genus CYCLOSTOMA, the sexes are 
separate. They live on land, in somewhat humid places, 
under rotten leaves, or in the trunks of rotten trees, where 
they are sometimes found in great abundance, the common 
species especially, cyclostoma elegans. Its tentacula appear 
to be contractile, though M. de Férussac has asserted that 
they are retractile, which is contrary to all analogy, for ten- 
tacula of this kind are not known, except in the limacine. 
This little mollusca is remarkable for the mode in which it 
moves, making sorts of steps or strides, as M. de Férussac 
has observed, though this seems to be done by means of its 
foot, and its proboscidiform mass, and not by raising the two 
lateral parts of the foot alternately. 
The females of the PALUDIN&, which are always bigger 
than the males, present, in the apparatus of generation, a 
disposition which has been erroneously thought to be peculiar 
to these animals in the great development of the second part 
of the oviduct, to which the name of matrix has been given, 
and where the eggs are accumulated, until they are sufficiently 
developed to disclose the young, so that the little paludine 
come forth from the body of the mother in the living state. 
SO ns ee 
