C «AP. IX. 
MOLLUSCS. 
325 
“ Qons, ne saurait mettre en doute la seduction deployee 
“dans les mouvements et les allures qui preparent et 
“ accomplissent le double einbrasseinent de ces ber- 
“ maphrodites.” These animals appear also susceptible 
°f some degree of permanent attachment: an accurate 
observer, Mr. Lonsdale, informs me that lie placed a 
Pair of land-shells ( Helix pomatia), one of which was 
"'Giddy, into a small and ill-provided garden. After a 
s bort, time the strong and healthy individual disappeared, 
and was traced by its track of slime over a wall into an 
adjoining well-stocked garden. Mr. Lonsdale concluded 
that it had deserted its sickly mate ; but after an 
absence of twenty-four hours it returned, and apparently 
Communicated the result of its successful exploration, 
for both then started along the same track and disap- 
peared over the wall. 
Even in the highest class of the Mollusca, namely the 
Cephalopoda or cuttle-fishes, in which the sexes are 
Separate, secondary sexual characters of the kind which 
Vv e are here considering, do not, as far as I can discover, 
0 c cur. This is a surprising circumstance, as these 
a fomals possess highly-developed sense-organs and have 
e °nsiderable mental powers, as will be admitted by 
"Very one who has watched their artful endeavours to 
es cap e from an enemy . 2 Certain Cephalopoda, however, 
ai ' 6 characterised by one extraordinary sexual character, 
hatnely, that the male element collects within one of 
foe arms or tentacles, which is then cast off, and, 
Ringing by its sucking-discs to the female, lives for 
a ^me an independent life. So completely does the 
cast-off arm resemble a separate animal, that it was 
described by Cuvier as a parasitic worm under the name 
of T>^ e6, ^ OT distance, the account wliich I have given in my 1 Journal 
Researches,’ 1845, p. 7. 
