502 
MOLLTJSCA.. 
This species is called the Hooked Squid, 0. Banksii. Its length from the tail to the end of 
the tentacles is six feet. The two largest of these are furnished with stickers and hooks, which 
enable the animal to seize its slippery prey with a powerful grasp. It appears that these 
creatures are not only of large size, 
but are truly formidable; the natives 
of the islands of the Pacific who 
dive for shell-fish have a great dread 
of them. 
Genus CHEIROTEUTHIS : Chei- 
roteuthis. — Of this there are t'wo 
species in the Atlantic and Mediter- 
ranean. One of these, Bonelli's 
Cheiroteuthis, C. Bonelli, has the 
body eight inches long, and the 
longest tentacles nearly three feet. 
The Cephalopoda seem to con- 
stitute a favorite form of existence 
in the operations of nature. Not 
only are the forms greatly diversi- 
fied, but the species, swarming in 
almost every part of the ocean, are 
infinitely multiplied. Nevertheless, 
in former ag^es of the world analo- 
gous species were still more abund- 
ant than are the present ones. 
Of those kinds called Belemites, 
which are now all extinct, the ves- 
tiges of nearly a hundred species 
have been discovered, distributed 
throughout Europe. The soft parts 
of these animals have perished 
aares affo, and there now remain 
only the internal shells or pens, 
somewhat resembling those of 
the living calamaries. Impressions, 
however, of belemites are preserved 
in some fine-grained strata, from 
which it has been ascertained that they resembled the loligo in form, their arms having been 
furnished with sharp hooks instead of suckers. It is supposed that these animals lived near 
shores where they were in danger of striking against rocks and other fixed objects ; the shells 
had a provision to prevent injuries from such a source. 
BONELLl S CHEIROTEUTHIS. 
ORDER 2. TETRABEANCHIATA. 
This term, from the Greek tetra, four, and the Latin hranchia, a gill, alludes to the possession 
of four gills by the several species of the order. The only existing kinds are those of the genus 
Nautilus, of which three or four species are found in the Persian, Chinese, and Indian seas; 
all the rest have perished, and are only known by their shells, which, however, are amazingly 
abundant. All these animals resembled the cuttle-fishes ; they were carnivorous, and appear to 
have served by their devastations to keep within bounds the mollusks, crustaceans, and fishes 
that teemed in the waters of remote geological periods. They are divided into two families, the 
JVautilidce and Ammonitidce. 
