328 SUPPLEMENT 
coasts of the Mexican Gulf,in the American Archipelago, and 
in all the rest of South America, are true limaces. Perhaps 
they may be species of veronicella. It would also seem that 
the true limax does not exist on the Indian coasts, nor in 
Polynesia, nor even in Australasia. This would be a very 
curious subject of research. 
It appears that the grey limaces, or slugs, seek human habi- 
tations in preference, more than the others do, from which 
Swammerdam has thought proper to separate the genus into 
domestic and rural slugs. The ZL. agrestis, though a very 
small species, is, nevertheless, the one that is most hurtful to 
agriculture, in consequence of its great multiplication. It has 
been observed that two individuals, after coupling, have laid 
seven hundred and seventy-six eggs, and that these eggs may 
be dried eight times in succession on a stone, without losing 
their property of disclosing the young. 
A very curious species is the phosphorescent slug, L. 
noctiluca, which is only known after a description and 
figure, incomplete enough, given by M. d’Orbigny to the 
Baron de Férussac, and which the latter has published in his. 
work on the mollusca. It appears particularly remarkable, 
because towards the posterior extremity of the shield, there is 
a small disk, or pore, covered with a matter which is luminous 
in darkness. This limax, which is fifteen lines long, and 
seven thick, was found under stones, in the Island of Tene- 
riffe. 
The limaces and terrestrial helices, for many years, have 
greatly occupied the attention of physiologists, and even of 
all persons who take any interest in scientific researches. 
Curiosity was excited to ascertain if, as Spallanzani had 
advanced, the head of these animals could be reproduced, after 
having been cut off. Observers were then busily engaged in 
various parts of Europe, in immolating to their (shall we not 
call it) cruel thirst for knowledge, myriads of these poor ani- 
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