438 PHILOSOPHY OF ZOOLOGY. 



Head surrounded with Eight Arms without Feet. 



The suckers have soft margins. The sac is destitute of 

 fin-like expansions, and is either simple or strengthened in 

 the interior by two sliort corneous processes. The head is 

 united with the sac behind, without the intervention of a 

 neck. 



a. Amns all equal in Size. 



3. Octopus. — Suckers arransed in a double row. 



The suckers are sessile. The oviduct is double. The 

 margin of the anus is simple. The Sepia octopodia of Lin. 

 is the type of the genus. 



4. Eledona. — Suckers on the arms disposed in a single 

 row. 



M. Lamark has figured and described two species of 

 this genus, in the Mejn. de la Soc d'Hist. Nat. One of 

 these is a native of the Mediterranean, and is remarkable 

 for ^ving out an odour like musk. 



b. Anns unequal. 



5. OcYTHOK. — Two of the arms at their inner extremities 

 furnished with membranaceous expansions. 



In this genus, which was instituted by M. Rafinesque, 

 the suckers are in a double row, and supported on foot- 



The same distinguished naturalist has instituted anew genus nearly allied 

 to Loligo, from two species collected during the same voyage. The follow- 

 ing characters are assigned to it. 



" Genus Cranckia. — Body oval, sac-shaped ; fins approximating, their 

 extremities free ; neck with a frenum behind, connecting it with the sac, 

 and with two other frena, connecting it with the sac before. 



*' Sp. 1. Cranckia scabra.— Sac rough, with hard, rough tubercles. 



" Sp. 2. Cranckia maculuta. — Sac smooth, beautifully mottled with dis- 

 tant ovate spots." — " Narrative of an expedition to explore the river Zaire, 

 usually called the Congo in South Africa, in 1816, under the direction of 

 Captain J. K, TrcKRY, R. N." London, 1818, p. 410, 



