CEPHALOPODS. 493 
the spots take the tint of wine lees. When at rest the shades 
disappear. 
In Pinnoctopus cordtiformis, a member of this family, the body 
is oblong, with lateral expansions, as represented in the accompanying 
figure (Fig. 333). oo ; 
In Cirrhotheutis the arms are completely united in their whole 
extent by a thin membrane furnished with cirri, which alternate with 
certain suckers arranged in one row. Only one species (C. AZiéd/er2) 
Fig. 333.—Pinnoctopus cordiiformis (Q. & G.). Fig. 334.—Cirrhotheutis Milleri (Eschricht). 
of this genera is known as an inhabitant of the northern seas, which 
is represented in Fig. 334. 
The sixth family, Azgonautide, contains only one genus, 
Argonauta. 
Argonauta argus is the Paper Nautilus. Floating gracefully on 
the surface of the sea, trimming its tiny sail to the breeze, just 
sufficient to ruffle the surface of the waves, behold the exquisite living 
shallop! The elegant little bark which thus plays with the current is 
no work of human hands, but a child of Nature: it is the Argonaut, 
whose tribes, decked in a thousand brilliant shades of colour, are 
wanderers of the night in innumerable swarms on the ocean’s 
surface ! 
The marine shell which Linnzeus called the Argonaut enjoyed 
