Ixti A Short Explanation 
are placed between the teftaceous fhelly la- 
mellz or plates. 
d The firftor upper lamella or plate, in which 
appear the marks of the columns, broken 
away from it. 
e The lower or fecond plate. 
f Some tranfverfal fibres of a fhelly fubftance, 
which bind the columns together, and there~ 
by add confiderably to their firmnefs. 
F LG.” VIL. 
Some of the plates, juft now exhibited, removed 
Jrom the columns that fupported them. 
g Their hollow tubular conftruction, in confe- 
quence of which they mutt naturally contain 
a portion of air, and of courfe the bone can 
{wim on the furface of the water. 
PL AG Sx 
The tail of the Cuttle-Fifh’s bone, drawn after 
nature. 
4 A tharp point, thro’ which the Cuttle-Fith’s 
bone grows out. 
zz She membranaceous parts on each fide. 
k The place where the piece of bone, under 
our confideration, was broken off from the 
reft of it, fhewing fome beautiful globular 
eminences, which firft hardened into a {tony 
bone above the reft of the furface. 
Ar. ei 
PrelgG. eal: 
The heart and arteries of the Cuttle-Fifb, of 
their natural fixe. 
a The heart. 
b & The double auricle of the heart. 
cc Part of the largeft blood-veffels belonging 
to the gills, from which the auricles are fe- 
parated. d The great artery. 
ee Its two branches, running to the body of 
the mutis, while others proceed further. 
f Arteries extended to the bafe, or root of the 
brain, where they are afterwards diftributed. 
Two blood-veflels, iffuing from a lower 
part of the heart. They are full of veins. 
FP Ge Tl Wand IV. 
The brain, nerves, and eyes, of their natural 
izes 
a The brain. 
6 Fat lying near the brain, reprefented by dots. 
cc The optic nerves, whofe origens are like- 
wife invefted with fat. 
dd Knotty dilatations of the optic nerves. 
eeee Nerves fent in great numbers from the 
faid nodules or knots to the eyes. 
of the TABLES. 
J A blood-veffel, that interfects, the nerves rtn- 
ning to the eyes. 
g A great many little nervous fibres in the 
choroides of the eye. 
hb 'The place where the faid coat’ converges a 
little more in form of a globe about the: 
cryftalline lens, and thereby forms the iris 
of the eye. 
7 A portion of the cryftalline lens, eden 
beyond the eye. - . 
FIG. II. 
k The cover of the pupil, on that fide pte 
I cut it off from the eye. 
/ That fide of .the {aid cover, which a 
freely in the aqueous humour. 
BiskGafihy 
m The manner in which the cryftalline lens‘is 
divided to a great depth by the ciliary nes 
_ ment. 
Pe Wee ke, 
11 22 23 Three pair of nerves iffuing from 
the brain, the middlemoft of which is posh 
tifully dilated into a nodule. 
m All thefe nerves are diftributed amoneft the 
fore parts of the head. 
oo Cartilages enclofing the brain. 
pp Cartaliginous expanfions, in which the 
mufcles of the legs are placed, and in the 
middle of which the head and fhout, or beaks 
of the Cuttle-Fith, is placed. 
gq Two ftrong nerves, which iffue from the 
bottom or root of the brain on its hinder 
part. 
rr Two nodules, which thefe nerves form 
in the breaft, and from which great num- 
bers of nerves run to the lower parts of the 
Cuttle-Fith’s body. 
FIG. Ve and Vis 
The tefticle and its parts, of their natural dimen- 
fins, viewed on each fide. 
a Some little white bodies, which I found hang- 
ing in this creature on the outfide of the 
vas differens. 
6 The pointed extremity of the tefticle. 
c The corpus variciforme of the tefticle. 
d Its extremity, as far as I have as yet 3 
able to trace it. 
e The place where the paraftate are moft ample 
and {pacious, as may be {cen in the tefticle, 
turned upon its other fide. 
F 1G, V1. 
Jf Some other minute extracted from the tefti- 
cles, which was full of them. Thefe paris 
are all loofe in the hinder part, without the 
leaft faftening. 
| g Some 
h. 
Xe 
