MOLLUSCA— CEPHALOPODA. 
145 
Fig. 78. — Cephalopoda, a, b, c, Khyncholiths, fossil beaks of a nautilus 
from the Miocene of Malta ; nat. size ; d, the Pearly Nautilus in its 
shell, part of which has been cut away so as to show the chambers 
aud the siphuncle running through them. On the animal are seen 
the visceral hump (a), the muscle and ring of attachment (g), the 
eye (s), the funnel (k), the tentacles {p), and the hood (n). e and /, 
the squid, Loligo ; the shell (c) is seen from the back, the animal (/) 
from the under side ; d, e, /, are much less than natural size. 
chief organs iii the forepart of the body, and the strong jaws, 
show that tliese animals can prey npon others, even on those 
with hard coverings, and lead one to regard them as more 
highly developed than the other Mollusca. All these features Between 
can be recognised in the exhibited specimens and models of Wall^cases 
living cephalopods. Further study of these specimens will Table-case 
show certain differences between the forms that have been 1. 
mentioned. Thus the cuttle-fish, squid, and octopus have 
rather long distinct arms, and these are furnished with 
suckers strengthened by horny rims; in the nautilus 
L 
of the skin forms a mantle-fold on the under surface and Gallery 
encloses the gills. In front of the gills another part of the ^ 
foot is folded together to form a funnel through which the 
water that has pas.sed into the gill-chamber can be forcibly 
squirted out. fly this means the animal can be driven 
backwards through the water (Fig. 87). The mouth is armed 
with strong horny jaws, shaped like a parrot’s beak (Fig. 
78 a-e). The power of locomotion, the concentration of the 
