AllTEMI A. 
57 
Anatomy and Physiology , 8fc . — The Artemia resembles 
the preceding genus so much in anatomical structure, that 
it is unnecessary to enter fully into details. The superior 
antennae in both sexes, and the inferior in the female, are 
exactly similar to those of the Chirocephalus (t. II, f. 2d). 
The prehensile antennae of the male (t. II, f. 2 a) differ, 
however, in two or three respects. They are large, flat, and 
curved downwards towards the thorax, as in the Chiroce- 
phalus, and are also divided into two articulations. The first 
articulation is much more simple than that of the Chiro- 
cephalus, and has none of the complicated apparatus 
attached to it which is so remarkable in that genus ; while 
the conical, antenna-like appendage is firmly attached to 
its inner edge, and is not moveable. The second joint is 
flat, broad, bent nearly at a right angle about the middle 
of its length, and sharp-pointed. 
The two lateral pedunculated eyes and the median 
sessile, black spot are precisely similar to those of the 
Chirocephalus, and the organs of the mouth do not differ 
in any circumstance but in the lip being rather more 
developed. 
The divisions of the thorax are not quite so distinct as 
in the Chirocephalus, but they are of the same number, 
and as each division has attached to it a pair of branchial 
feet, these organs consist also of eleven pairs, notwith- 
standing that Latreille, followed by Desmarest, asserts 
they have only ten. In structure they resemble almost 
exactly those already described in the preceding genus 
(t. II, f. 2 c). They gradually increase in length from the 
first to the sixth, and decrease again from that to the 
eleventh. 
According to Joly, the abdomen is only composed of 
six instead of nine articulations. The first has the ex- 
ternal ovary attached to it in the female and the organs of 
generation in the male, while the last is by much the 
longest, and terminates in two short, conical prolongations, 
furnished at their extremities with a few short hairs. 
The external ovary is of a somewhat quadrilateral shape, 
