ORDER BRANCHIOPODA. »341 



which he names the posterior lobule of the labrum. Im- 

 mediately underneath are two mandibles, (interior jaws, 

 Ramdohr), very strong, without palpi, directed vertically, 

 and applied on two horizontal jaws, (external jaws, Ramdohr), 

 terminated by three robust corneous spines, in the form of 

 curved hooks. Then come ten feet, all having the second 

 articulation vesicular ; the first eight are terminated by an ex- 

 pansion in the form of a fin, furnished on its edges with setae 

 or barbed filaments, disposed in the manner of a crown or 

 comb ; the two anterior appear more especially adapted 

 for prehension. Accordingly, M. Ramdohr takes them for 

 double palpi (internal and external). These are the same 

 pieces that Jurine elsewhere calls hands. In the figure which 

 he has given of them, the terminal setae appear to be barbed. 

 We do not see why these appendages might not serve for 

 respiration, a property \vhich M. Straus grants only to the fol- 

 lowing, because these latter have, in addition, a lamina on the 

 internal side, which, with the exception of the last two, is 

 bordered with a range of setae, in the manner of a comb, and 

 equally barbed, to judge from the figures given by Jurine and 

 M. Ramdohr. The last two feet have a structure a little diffe- 

 rent, and M. Ramdohr distinguishes them under the name of 

 claws. The abdomen, or the body properly so called, is 

 divided into eight segments, perfectly free between its valves, 

 narrow, elongated, curved underaeath at its extremity, and 

 terminated by two small hooks turned backwards. The sixth 

 segment presents, on its upper part, a range of four nipples, 

 forming denticulations, and the fourth, a sort of tail. The 

 ovaries are placed along the sides, between this segment and 

 the first, and open separately near the back, into a cavity 

 (matrix, Jurine), situated between the shell and the body, 

 where the eggs remain for some time after being laid. 



Mliller has given the name of ephippium or saddle to a 

 large, obscure, and rectangular spot, which at certain periods 



