ORDER BRANCHIOPODA. 335 



setaceous^ composed of seven or eight articulations, the last 

 of which are shortest, and terminated by a fasciculus of ten 

 or fifteen setae, serving as fins. The mouth is composed of a 

 carinated labrum, of two large denticulated mandibles, each 

 supporting a palpus divided into three articulations, and to 

 the first of which adheres a small branchial plate, presenting 

 five digitations (interior labium, E,amd.), and of two pairs 

 of jaws; the upper two, much larger, have at the internal 

 edge, four mobile and setaceous appendages, and at the ex- 

 ternal side a large branchial plate, pectinated at its anterior 

 edge ; the second are composed of two articulations, w ith 

 a short palpus (forked in cyprh strigata, Ramd.), almost coni- 

 cal, inarticulated, silky at the end, as well as the extremity 

 of their jaws. A sort of compressed sternum performs the 

 office of lower labium (external labium, Ramd.) The feet 

 are divided into five articulations, the third of which repre- 

 sents the thigh, and the last the tarsus ; the anterior two are 

 inserted below the antennae, much stronger than the others, 

 directed forwards, with stiff setae, or long hooks, gathered 

 into a fasciculus, at the extremity of the last two articula- 

 tions ; the following four feet are without them. The second, 

 situated at the middle of the under part of the body, are at 

 first inclined backwards, arched, and terminated by a long and 

 strong hook, which goes forward ; the last two never appear 

 externally, are raised, and applied on the posterior sides of 

 the body, to support the ovaries, and are terminated by two 

 very small hooks. In the figure of Ramdohr, these feet have 

 but three articulations, and the last is a little dilated and 

 emarginated at the end, with a hook in the middle of this 

 emargination. The body presents no distinct articulation, 

 and is terminated posteriorly in a kind of tail, soft, folded 

 underneath, with two conical or setaceous filaments, furnished 

 with three setae or hooks at the end, directed backwards, and 

 issuing from the testa. The ovaries form two large simple 



