4 
CATALOGUE OF CEPHALOPODA. 
Fam. L OCTOPID/E. 
united to tlie head in front by a medial fleshy band. 
Head without any aquiferous opening. Arms conical, tapering* 
with short sessile cups. No external nor internal medial shell. 
Living near the shores amongst rocks. 
Acochlides Latr. Fam. Nat. 168. 1828. 
Octopidae TP Orb. Moll. Viv. et Fos. i. 159. 164. 1845. 
Octopodina Gray , Proc. Zool. Soc . 1847, 205. 
Synopsis of the Genera. 
1. Octopus. Arms with two rows of cups. Body round, without 
fins. No aquiferous Cells between the bases of the arms. 
2. Cistopus. Arms with two rows of cups. Body round, without 
fins. Distinct aquiferous Cells between the bases of the arms. 
3. Pinnotopus. Arms with two rows of cups. Body with fins. 
4. E led one. Arms with one row of cups ; without beards, and 
united by a short web. Body round. 
5. Cirroteuthis. Arms with one row of cups, bearded, and 
united by a broad web. Body finned. 
A. Arms with two Rows of Cups . 
1. OCTOPUS. 
Body small, round, without any lateral fins, often cirrose. Cirri 
often nearly disappearing in repose, and when preserved in 
spirits. — Head with two small internal cartilages, one on each 
side of the beak ; in the direction of the body (not oblique), 
narrower than the body. Eyes small, lateral, covered by the 
continuation of the surrounding skin, and often by one or two 
transparent eyelids. Beak very much compressed. External 
ear slightly marked above the cervical band. No aquiferous 
cells between the bases of the arms. — Arms unequal, elongate, 
united at the base by a web, which is wider beneath. Cups 
sessile, two-rowed, flat. — Siphuncle elongate, conical, slender, 
without any superior bands, or valve. — Living on rocks on the 
coast, very agile, eating Crustacea, and changing their colour 
rapidly. Egg transparent, in bunches attached to Algae. 
rio\i>7rou£ Aristoteles. 
Polypus Plinius , Belon , Rodeletius . 
