CYPRIDJE. 
147 
a comb. The square plate with its fingers must be 
Jurine’ s third pair of feet; though^ if so, the figure which 
this author gives of these organs, as well as of his second 
pair of feet (the palpi of the mandible of Straus), is de- 
cidedly incorrect.* The second pair of jaws is much smaller, 
and is articulated on to the posterior angle of sternum, 
by means of the two curved apophyses at its extremity 
(t. XVIII, f. 1 /). Each jaw consists of two flattened 
joints, the latter of which has several stiff hairs at its 
extremity, and from its external edge gives off a rounded 
finger, which Straus says he thinks must be considered 
as a palpus. 
There is much discrepancy amongst the several authors 
I have so frequently mentioned as to the number of feet. 
Muller and Ramdohr assert there are four, and the former 
remarks upon the singularity of an insect quadruped. 
Straus enumerates six ; while Jurine says there are eight.f 
M. Edwards however restricts, very properly, the number 
to two pairs. The first pair (t. XVIII, f. 1 g) is slender, 
cylindrical, and composed of five articulations; the last 
of which is terminated by one long curved hook. The 
basilar joints of these organs are directed backwards ; the 
succeeding joints downwards, and the terminating ones 
forward. The second pair (t. XVIII, f. 1 h) arises imme- 
diately behind the first, and consists of four articulations, \ 
the last of which is terminated by two short hooks, and 
has a filament thrown back from its extremity like a spur. 
* He seems to have been ignorant of the existence of the branchial plate, 
as he asks, “If it be true that the branchiae be the first character of the 
Crustacea, where shall we place them in these Monoculi ? In the antennae, 
feet, or tail? We cannot give a preference to any one of these parts over 
another.” 
f Muller was not aware of the existence of the organs which Straus calls 
the third pair of feet. Ramdohr was, but considers them as connected with 
the male organs of generation ; while Jurine says that they are organs arising 
from the matrix, the use of which he does not understand. In addition to 
the first and second pairs of Muller, Ramdohr, and Straus, Jurine considers 
the organs which Muller calls the “ barbillons,” attached to the mouth (the 
palpi of the mandibles of Straus) and the branchial plate of the upper jaw, 
as two additional pairs of feet. 
X Straus says five. 
