ORDER PCECILOPODA. 
375 
Cecrops, Leach , 
Of which but a single species is known, which has been found 
attached to the gills of the tunny and the turbot, the Cecrops 
de Latreille (Leach, Encyc. Brit. Suppl. i. pi. xx. 1. 3, male, 
— 2, 4, female— 5, antennae, magnified. Desm. Consid. 1. 2.) 
The second tribe, that of Lerjeeiformes, ZaZ, is com- 
posed of entomostraca still more approximated than the pre- 
ceding, from their external forms, to the lernese. The number 
of discernible feet is but ten, and these organs are for the most 
part very short, and not at all, or but little, adapted for swim- 
ming. Sometimes the body is almost vermiform, cylindri- 
cal, with the anterior segment simply a little broader, and 
provided with two advanced didactylous forceps ; sometimes, 
in consequence of two lateral expansions in the form of lobes, 
or wings, thrown behind the thorax, and of the two posterior 
ovaries, it forms a small quadrilobate mass. This tribe is 
composed of two genera. The first, that of 
Dichelestium, Hermann (Son), 
Presents us with a narrow and elongated body, a little dilated 
in front, composed of seven segments, the anterior of which 
{corslet, Hermann), is broader, rhomboidal, formed of the head, 
and a portion of the thorax united. It supports, 1st, four 
short antenna;, the lateral of which are filiform, and composed 
of seven articulations, and the intermediate advanced in the 
manner of little arms, of four articulations, with the last in 
the form of a didactylous forceps; 2nd, a siphon, inferior, 
membranaceous, and tubular; 3d, three sorts of shapeless 
palpi (two multifid feet ?) on each side, situated on a promi- 
nence ; 4th, four feet adapted for seizing, of which the first 
two are formed of a thigh and leg, and terminated by divers 
unequal and denticulated hooks, and the second consist of an 
