APPENDIX, No. II. 401 
and afterwards on the voyage, he took by means of a small 
net, (which was always suspended over the side of the vessel) 
several specimens of a new species of Ocythoé, which were 
swimming in a small argonauta, on the surface of the sea. 
On the 13th of June he placed two living specimens in a 
vessel of sea water; the animals very soon protruded their 
arms and swam on and below the surface, having all the actions 
of the common polypus of our seas; by means of their suckers, 
they adhered firmly to any substance with which they came in 
contact, and when sticking to the sides of the basin, the shell 
might easily be withdrawn from the animals: They had the 
power of completely withdrawing within the shell, and of leaving 
it entirely. One individual quitted its shell, and lived several 
hours, swimming about, and showing no, inclination to return 
into it; and others left the shells, as he was taking them up-in 
the net. They changed colour, like other animals of the class 
cephalopoda: when at rest the colour was pale flesh-couloured, 
more or less speckled with purplish; the under parts of the 
arms were bluish grey; the suckers whitish, 
The Ocythoé differs generically from the polypus, in having 
shorter arms, with pedunculated instead of simple suckers ; the 
superior arms too are dilated into, or furnished with, a wing- 
like process on their interior extremities. 
All the internal organs are essentially the same as in the poly- 
pus, although they are somewhat modified in their proportion ;, 
but as these differences may be the result of the contraction 
caused by the spirits, in which they are preserved, it may be 
more prudent not to dwell on them. Two characters, however, 
which I could not discover in the polypus, may be mentioned, 
namely, four oblong spots on the inside of the tube, resembling 
surfaces for the secretion of mucus ; two inferior and lateral, 
* and two superior, larger, and meeting anteriorly. On the rim 
