= 
370 EXPLANATION OF PLATES. 
PLATE I. %— 
This Plate is explanatory of the nomenclature of the external and 
internal parts of the Loligo magna, belonging to the Class Cepha- 
lopoda. (This Plate has not been found.) 
Fig. 1*. View of the mouth, showing the situation of the mandibles 
or beak, surrounded by the lips and ten legs, two of which are 
longer than the others, and may be termed brachia, arms. 
Ld. Labiun, lip. 
Avy. The annular reflection of the lip. 
X. A dilatation of the lp into an angulated membrane, whose 
angles are furnished with antlize or suckers armed with 
horny rings, as in figs. 2 and 3. 
| ies Pedes, feet. 
P.s. Pedes superiores, upper feet. 
P. int. Pedes intermedi, termediate feet. 
P.7. Pedes inferiores, inferior feet. 
P. sp. Pedes supplementarii aut brachia, supplementary feet or arms. 
*Avr. Anthie, suckers. 
Fig. 2. One of the suckers of the arms, highly magnified, viewed 
from beneath to show. its peduncle. 
Fig. 3. One of the horny rings of the suckers, very highly magnified, 
to show the serratures of the outer edge. 
Fig. 4*. Mandibule, mandibles or beak, of the natural size. 
Fig. 5. The sae or body lying on its back, opened up the middle, 
and the right side turned back, to show the natural position of 
the branchiz or gills. The Figure is half the size of the speci- 
men from which it was delineated. . 
CE The cloaca, with its left side turned back, to show its valve 
(VI.), which prevents the water from passing through 
it into the sac. 
EE. A groove in the cartilage of the cloaca to receive a process 
of cartilage, xvd, projecting from the inside of the sae. 
At. gl.c. Atramenti glandula canalis. The ductor canal which con- 
ducts the black liquor from the gland which secretes it 
to the bottom of the cloaca, through which it is ejected, 
along with the water contained in the sac, to darken 
the water, so as to defend itself from its enemies. 
Pn. Pinna, fin. 
* Figs. 1 and 4 are of the natural size of the animal from which this 
Figure was delineated. 
