CONCHOLOGICAL WRITINGS. 95 
Todarus argo, as it differs from Loligo bythe 2 superior Antenopes 
having a cuneiform wing or broad membrane, yet it has the body 
of Loligo, with 2 posterior round wings, and an internal Aploste, 
linear subulate thin and flexible. 
This animal is exactly of the size and flexible shape suitable to 
-enter the Argonauta and dwell therein: although I never was sure 
that it was the real producer of the shell—the fishermen asserted it, 
it is met floating with it and using its 2 winged feet as sails, I had 
it caught and brought to me with its black eggs filling the bottom 
of the shell—and yet I never was positive as to being the real 
mysterious Argonauta. I was once inclined to believe it, but the 
animal was so different from that described by Montford and others, 
its body was so unlike the fluted shell, that I always had great 
doubts. 
[65] 
It is well known that many shells of Argonauta are blackened in 
their inner apex: this happens by the black eggs laying there, 
although the Todarus has not the ink bag of the real Loligos, yet 
it emits a kind of dark liquor and its eggs are blackened by it. I 
incline to believe that it uses the shell as a home, boat and nest, at 
the time of laying eggs, and changes the shell yearly. It has no 
kind of adhesion to it, and may be entirely withdrawn with ease. 
I give here the figures of both Ocythoe and Todarus argo. This 
last is fulvous grey above, white beneath, body oblong smooth, 2 
rows of alternate cupules on the antenopes that are shorter than 
body, but promuscides as long without cupules. 
A third Genus medial between these two was found by me in the 
Atlantic Ocean in 1815, and I procured 2 sp. of it, both pelagic, 
floating at the surface. I called it Canopus then, but this name 
being employed I have changed it to Anisoctus mg 8 unequal. 
G. Anisocrus Raf. differing from Octopus by body as Loligo with 
a very small subulate aploste (internal bone) but 8 unequal Ante- 
nopes,*as in Octopus. 
1. Anisoctus punctatus Raf. L. body whitish dotted of brown, 
Antenopes cylindrical coiled at the end, 2 longer, 2 shorter, cupules 
alternate—5 inches long. 
2. Anisoctus bicolor Raf. body bay above, white beneath, ante- 
nopes trigone acute nearly equal cupules alternate—7 inches long. 
Figure 50, Ocythoe tuberculata. 
