SOME NEW AND RARE CEPHALOPODA. 129 
is generally attached to the sides of the mantle ; the branchial hearts are without fleshy 
appendages ; the biliary ducts without follicular appendages ; the shell is represented 
by two short, brittle, horny or gelatinous styles, encysted in the dorso-lateral parts of 
the mantle. This family includes the genera Octopus, Leach, and Eledona, Leach. The 
following is a tabular view of my classification of the Cephalopods :— 
Classis. Ordines. Tribus. Familie. Genera. 
Nuda Eledona. 
Gsininire mg) «chats vieibbhes ces tiie snk Octopus. 
Wentnven Argonauta. 
We teen Bellerophon, &c. 
Loligopsis. 
Drsrancuiata Cranchia, 
Oe Pa Teuthide Sepiola. 
< Rossia. 
5 6. 4 Onychoteuthis. 
Loligo. 
8 l Decaropa..... Sepiotcuthis: 
= } Sepiade...... Sepia. 
x | zalensnitce. ... » Belemnites, &c. 
Fs Spirulide ..... Spirula. 
oO ao Ammonites, &c. 
\.TETRABRANCHIATA!. . 2.1... 2..000.- Bram ets! tse 
Nautilide ..... be a oa 
Orthocera, &c. 
PLATE XXI. 
Fig. 1. Cranchia scabra, dorsal aspect ; natural size. 
2. Cranchia scabra, ventral aspect ; natural size. 
3. Cranchia scabra, head, with the mantle, a, a, laid open to show the attachment 
of the funnel 6, by means of the muscular membranous processes or 
‘brides’, c, c. Magnified. 
4. Head and mouth of Cranchia scabra, showing the webs, a, connecting the six 
dorsal arms; the outer lip, 6, the inner lip, c, inclosing the gaping man- 
dibles. Magnified. 
5. A small portion of the skin of Cranchia scabra, showing the denticulate pro- 
cesses, highly magnified. 
6. Loligo laticeps, dorsal view ; natural size. 
7. Loligo laticeps, ventral view ; natural size. 
9. A sucker of one of the short arms, magnified. 
1 The subdivision and grouping of the very numerous members of this order must repose entirely on a study 
of the modifications of the shell and other enduring parts; and I have here introduced provisionally the two 
principal divisions as proposed by M. D’Orbigny, merely for the purpose of citing the principal genera in ex- 
emplification of the Tetrabranchiate Order. 
s2 
