OCTOPIA. 
3 
Cephalopoda dibranchia Owen , Trans. Zool. Soc. ii. 103. 1838. 
C. dibranchiata Gray , Proc. Zool. Soc. 1847, 204. 
Antliobrachiaphora, Anosteophora, et Sepiaphora Gray. Lond. 
Med. Rep. 1821. 
C. antepedia Rajin. Anal. Nat. 139. 1815. 
Order I. OCTOPIA, 
Body short, rounded, united to the head by a broad cervical band. 
Sometimes ? covered with a thin single-chambered shell. 
Head very large, with aquiferous opening; none on the gills or 
lips. Siphuncle without any internal valve. Eyes fixed, united 
to the skins, incapable of rotation. Buccal membrane none. 
Arms eight, all sessile, without swimming membranes. Cups 
sessile, flat, and without any horny ring. Tentacular arms none. 
No internal medial dorsal shell. 
The front of the mantle is supported by a fleshy band or by fleshy 
buttons on the siphon ( apparatus of resistance , D’Orb.), fitting 
into grooves on the inner side of the mantle. 
Cephalopoda octopoda Leach , Zool. Misc. iii. 1817 ; Ferussac , 
Tab. Syst. 18. 1821 ; Gray , Proc. Zool. Soc. 1847, 204.; Latr. 
Fam. Nat. 167. 1828. 
Antliobrachiaphora, Anosteophora, Gray , Lond. Med . Rep. 1821. 
Cryptodibranchiata octocera Blaine. Diet. Sci . Nat. xxxii. 1824; 
Merike, Syn. ed. 2. 1830. 
Cephalopoda octopodas Menke , Syn. 1. 1828. 
C. octopoda Gravenhorst , Thier. 1845. 
Octopodidse Gray , Proc. Zool. Soc . 1847, 204. ; Cantr. Malac . 
Medit. 13. 1841. 
C. octopia and argonautea Rajin . Anal. Nat. 140. 1815. 
C. octobrachides Blainv. 
C. octoceres Blainv. 
Synopsis of Families. 
I. Octopidje. Arms subulate. Mantle supported by fleshy 
bands. No cephalic aquiferous apertures. 
II. Philonexidie. Arms subulate. Mantle supported by two 
buttons at the base of the siphuncle, fitting into grooves on 
the mantle. 
III. Ocythoidje. Arms subulate, two upper palmate. Mantle 
supported by two buttons fitting into grooves on the base 
of the siphuncle. 
B 2 
