470 MOLLUSCA. 
CEPHALOPODA. 
ARGONAUTA GENICULATA (Gould). 
Corpus ovatum, supra gibbosum: caput breve, angustum: ocult magni, 
prominentes, pupillo nigro; iride aurato: sipho conicus, elongatus : 
os magnum ; rostris fortibus: brachii bast adnati, superioribus cylin- 
dracets, geniculatis, vexillum semiellipticum, flocculosum gerentibus ; 
brachis secundis longissimis: color virescenti-argentata, punctis choco- 
latis oculatis variegala. 
Body ovate, shghtly gibbous on the back, like the abdomen ofa spider; 
aperture large, transverse, extending above the eyes. Head narrow, 
short, scarcely affording space for the eyes. Eyes large, prominent, 
almost pedunculate; pupils black, surrounded by an inner circle of 
golden yellow, enclosing which, is a circle of gold, silver, and green 
combined. Siphon long, extending nearly one-third the Jength of the 
arms, pyramidal, with convex outline, and small aperture, somewhat 
compressed from above downwards. Mouth rather large; beaks very 
strong, lower part convex beneath, not carinate. Arms all connected 
at base by a membrane; second pair longest. Cupules numerous, 
nearly sessile, rather crowded, especially on the third pair, where there 
are about sixty; on the second pair, the two series diverge at the distal 
third; on the fourth pair, they are less crowded, and affect somewhat 
a single series; the upper pair consists of a rounded, sub-cartilaginous 
peduncle, bearing cupules, which, at the point where the banner-like 
membrane commences, forms a sort of joint, and is bent at right-angles, 
so as to present the reverse side of the membrane. This mem- 
brane is elongate, ovate-triangular, having its inner surface honey- 
combed with a network of cells; after diverging somewhat, the cupules 
coalesce at its upper margin, along which they run to the extremity, 
but do not pass round to the lower margin. Colour formed by nume- 
rous chocolate dots, surrounded by annuli of a golden green, beneath 
which, the body is pale straw-colour; the head, arms, and belly have, 

