two new Species of Hectocotyle. 2] 
the smallest doubt, that if it were established that the Hect. Argonaute is the 
male of the Argonaut, a similar relation would be admitted for the Hectocotyle 
of the Tremoctopus. The same may be said with still greater certainty of 
Cuviers Hectocotyle Octopodis, (which has not since been observed by any 
one,) more especially because this animal, size excepted, almost entirely agrees 
with the Hectocotyle Argonaute. 
In conclusion, I sum up in a few words all that may be said upon this 
subject. 
1. The Hectocotyle have arteries and veins, a heart and branchize, and are 
therefore very probably not Epizootic worms. 
2. Hect. Argonaute and Hect. Tremoctopodis bear a close resemblance to 
Cephalopoda in general, and in particular to the genera on which they live, 
for they have 
a. The same spermatozoa. 
b. Contractile piginent-cells. 
c. Similarly formed and similarly organized suckers. 
d. The same remarkable arrangement of the muscular fibres; the Hecto- 
cotyle in the muscular envelope of the body, the Cephalopods in the 
arms. 
3. Among 280 Argonauts examined not a single male was found. 
4. Nevertheless, the males must be very abundant, inasmuch as nearly all 
the Argonauts possess impregnated ova. 
5. The Hectocotyle live in the neighbourhood of the female sexual organs 
of their Cephalopods, and are all males. | 
6. The eggs of the Argonaut contain, according to Madame Power and 
Maravigna, embryos perfectly resembling the Hect. Argonaute. 
If this last position is correct, the Hectocotyle Argonaute is undoubtedly 
the male of the Argonaut. 
