GENERAL CHARACTERS. 
3 
Table of the External Organs of the Amphipoda, with the Letters respec- 
tively attached to each, as employed throughout the engravings in this work. 
C Cephalon . 
H to 0 Pereion 
P to Z Pleon 
(C) a Eyes 
b Superior antennae : 1, first; 2, 
second; 3, third joint of pe- 
duncle; 3", secondary ap- 
pendage ; 4, flagellum. 
c Inferior antennae: 1, first; 2, 
second; 3, third; 4, fourth; 
5, fifth joint of peduncle ; 
6, flagellum. 
d Mandible; d" mandibular ap- 
pendage. 
e 
f 
9 
(H to 0) h 
i 
k 
l 
m 
n 
o 
(P to Z) p 
<1 
r 
s 
t 
V 
z 
First maxilla, or first si ago- ) 
nopodos * . j 
Second maxilla, or second) 
siagonopodos . . J 
Maxillipede, or third siago- ? 
nopodos ... 5 
1st Gnathopodos, represent- A 
ing the 2nd maxillipede, > 
or fourth siagonopodos. J 
2nd Gnathopodos, represent- A 
ing the 3rd maxillipede, > 
or fifth siagonopodos . ) 
1st Pereiopodos 
2nd 
do. 
3rd 
do. 
4th 
do. 
5th 
do. 
1st 
Pleopodos 
2nd 
do. 
3rd 
do. 
4th 
do. 
or 1st Uropodos 
5th 
do. 
2nd do. 
6th 
do. 
3rd do. 
Telson . 
Head. 
Body. 
Tail. 
Eye. 
Superior antennae : 1, first; 2, 
second; 3, third joint of pe- 
duncle ; 3", secondary appen- 
dage ; 4, flagellum. 
Inferior antennae: 1, first; 2, 
second; 3, third; 4, fourth; 
5, fifth joint of peduncle; 
6, flagellum. 
d Mandible or jaw; d" man- 
dibular appendage or 
palpus. 
e First maxilla. 
/ Second maxilla. 
g Foot-jaw or pedipalp. 
h 1st 1 
i 2nd 
■legs. 
k 3rd 
l 4th 
m 5th 
n 6th 
o 7th , 
p 1st \ 
q 2nd [natatory legs 
r 3rd j 
s 1st 
t 2nd 
v 3rd j 
z Terminal joint or middle 
tall -niece. 
[ caudal appendages. 
The corresponding joints of all the limbs are marked with the same number, 
and bear the same names throughout. We take one of the Gnathopoda as 
the type. 
1 Coxa 
1" Branchia 
1"' Plate of incubatory pouch 
2 Basos 
3 Ischium 
4 Meros; 4", inferior angle . 
5 Carpus; 5", inferior angle . 
6 Propodos ; 6',palma ; 6", inferior angle ; 
6'", inferior margin; 6 ,w , superior 
margin. 
7 Dactylos ; 7", Unguis . . . . 
Coxa. 
Thigh. 
Knee. 
Metacarpus ; 4", inferior angle. 
Wrist ; 5", inferior angle. 
Hand; 6', palm ; 6", inferior angle ; 
6"', inferior margin ; 6 W/ , supe- 
rior margin. 
Finger ; 7", Nail. 
* This name is here suggested as the Greek equivalent for the Lai in name of the five pairs 
of appendages succeeding the mandibles, which were collectively termed pates-m&choires by 
Cuvier, Savigny, &c. The lbvres superieure and infdrieure of these authors are omitted for 
the reasons assigned in the following page. — (I. 0. W.) 
B 2 
