CEPHALOPODA. 
9 
entirely at the will of the animal. The receptacle of the ink is seat- 
ed in the liver ; the glands of the oviducts are small. Some of them 
Polypus, Aristotle. 
Have two alternate rows of cups along each foot. 
The common species, Sepia octopodia, Lin., with a slightly 
Genus Renulina . . . . 'i 
.... Cristellaria. ... > Third Family. — Les Cristacees. . 
. . . Orbieulina .... J 
. . . . Miliola ...... 1 
.... Gyrogona .... / Fourth Family. — Les Spheruldes 
.... Melonia ' 
.... Rotalia -> 
. . . . Lenticulina. ... S Fifth Family. — Les Radioldes . . 
.... Placentula .... i 
.... Discorbis .... 
.... Siderolites .... 
.... Polystomella . . 
.... Vorticialis .... 
.... Nummulites . . 
Nautilus.. 
^ Sixth Family. — Les Nautilacdes 
J 
{ Shell semidiscoid; mul- 
tilocular, with sim- 
ple septa ; the spire 
eccentric. 
Shell globose, multilo- 
cular, -with simple 
septa, spheroidal or 
oval ; the whorls of 
the spire enveloping, 
or the chambers uni- 
ted in a tunic, 
r- Shell discoid, multilo- 
1 cular with simple 
I septa, spire central, 
J chambers lengthened 
I and discoid, extend- 
1 ing’from the centre to 
the circumference'. 
r Shell discoid, spire cen- 
I trical, cells short, 
and in a spiral line 
not extending from 
the centre to the cir- 
cumference. The 
greater number are 
fossil species. The 
S septa, as in the pre- 
ceding genera, sim- 
ple, neither notched 
nor undulated on the 
internal partition of 
the testaceous exte- 
_ rior. 
1 
.... Ammonites... 
.... Orbulites . . . 
.... Ammonoceras. 
.... Turrilites , . . 
. . . , Baculites . . . 
^ Seventh Family. — ^Les Ammondes 
■■ Shell multilocular ; sep- 
ta sinuous, lobed, 
and cut in their con- 
tour, uniting toge- 
ther against the in- 
ternal partition of 
the shell, and arti- 
culated in sinuous 
sutures divided and 
dentated. Most of 
these are known only 
in a fossil state. 
Second Division.- 
Genus Argonauta 
-Cephalopodes-monothalamcs. — Navigators. 
/ Shell unilocular, alto- 
gether external, and 
enveloping the ani- 
mal. 
1 
