two new Species o/" Hectocotyle. 21 



the smallest doubt, that if it were established that the Hect. Argonautoe 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 

 Cuvier's Hectocotyle Octopodis, (which has not since been observed by any 

 one,) more especially because this animal, size excepted, almost entirely agrees 

 with the Hectocotyle Argonautce. 



In conclusion, I sum up in a few words all that may be said upon this 

 subject. 



1. The Hectocotylce have arteries and veins, a heart and branchiae, and are 

 therefore very probably not Epizootic worms. 



2. Hect. Argonautce 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. 

 h. Contractile pigment-cells. 



c. Similarly formed and similarly organized suckers. 



d. The same remarkable arrangement of the muscular fibres ; the Hecto- 



cotylce 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 Hectocotylce 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. Argonautce. 



If this last position is correct, the Hectocotyle Argonautce is undoubtedly 

 the male of the Argonaut. 



