CATALOGUE 
OF 
CEPHALOPODA. 
Class IY. CEPHALOPODA. 
Head large, separate from tlie 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, Pegne 
Anim. 1817; Ferussac , Tab. Syst. 18. 1819; Lamck. Phil. Zool A. 
322. 1809, Ext. d. Cour. 1812 ; Be Haan , Monog. 1825 ; Grant , 
Lect. 1833 ; 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. 
B 
