CATALOGUE 



OF 



CEPHALOPODA. 



Class IV. CEPHALOPODA. 



Head large, separate from the body. Eyes large, complex, lateral. 

 Ears developed. Mouth armed with two horny or shelly jaws, 

 edged with fleshy lips, and surrounded by eight or ten fleshy 

 arms, or numerous tentacles ; and furnished with an entire or 

 slit tube, or siphuncle, used in locomotion. 



Body ovate, roundish, or cylindrical, open in front, containing 

 the viscera and one or two pair of internal symmetrical gills ; 

 naked ; surrounded by a thin shell, with a single cavity ? or partly 

 or entirely contained in last chamber of a chambered shell, 

 furnished with a siphon passing from chamber to chamber. 



Individual unisexual. 



Animal free, walking on its head or swimming in the sea ; propelled 

 by the water from the siphon tube. 



The water of respiration enters the large aperture in the front 

 of the body, and is expelled through the siphuncle, carrying with it 

 the faeces. The large nervous ganglion is contained in a carti- 

 laginous case, sending fibres to all parts of the body. 



Cephalopoda Cuvier, Tab. Elem. 1798, Anat. Comp. 1800, Regne 

 Anim. 1817; Ferussac, Tab. Syst. 18. 1819; Lamck. Phil. Zool. i. 

 322. 1809, Ext. d. Cour. 1812 ; De Haan, Monog. 1825 ; Grant, 

 Lect.\S32;D'Orbigny, Moll. Viv. etFos. i. 107. 1845 ; Gray, Proc. 

 Zool. Soc. 1847, 264.; Owen, Trans. Zool. Soc. ii. 103. 1838. 



Pterygiorum Latr. Earn. Nat. 153. 1825. 



M. brachiata (pars) Poli, Test. Sicil. 



Cryptodibranchiata Blainv. Diet. Sci. Nat. xxxii. 172. 1824; 

 Man. Malac. 364. 1825. 



