470 
THE OCEAN WORLD. 
Gahi (Fig. 328), we have two extreme forms represented, both taken 
from the magnificent work of MM. D’Orbigny and Ferussac, on th e 
Gephalopodes acetahulifores. These molluscs are whitish-bine and 
transparent, covered with spots of bright red. The osselet lS 
lanceolate — that of the male elongated and somewhat resembling a 
feather, that of the female much broader and more obtuse. Then 
head is short, furnished with two large projecting eyes ; the month 
is surrounded with ten arms, provided with suckers, two 
these being much longer than the others, having peduncles or foot' 
stalks. 
The internal bone of the calmar differs much from that of tb e 
cuttles ; it is thin, horny, transparent, and somewhat resembling a 
feather, from a portion of which the barbs have been removed. Th elJ 
food consists chiefly of small fishes and molluscs. With the great® 1 
fishes and cetacese they carry on constant war. They are caught and 
used for various purposes ; along the coast they are eaten ; the fisk er ' 
men use them as bait, especially in fishing for cod. 
Tentactjlifeeous Cephalopods. 
In place of bearing simple suckers ( Acetabula ), like the first order ot 
Cephalopods, this group is furnished with true organs of prehension, ° r 
tentacles. They differ from the first group chiefly in their nao re 
numerous arms, which are quite tentaculiferous, having neither sucker 
nor capsules, and by having an external shell. The number of li vlll £ 
species is extremely limited ; for this group of animals belong P ecU ' 
liarly to the earlier ages of our globe, is gradually becoming extm ct ’ 
and presents in our days only some very rare species, when wo comp aie 
them with the prodigious numbers of these beings which animated 
seas of the ancient world. In fact, the only living type of the ord e1 ’ 
is the nautilus, which has a singular resemblance in form 1° 
argonaut. 
The shell of this mollusc is a regular spiral, with contiguous turDSj 
the last turn enclosing all the others. It is divided internally fa® 
numerous cells, formed by transverse partitions* concave in front 
perforated towards the centre, and forming a kind of funnel, wh lC 1 
gives passage to a respiratory siphon. 
