354 CLASS CRUSTACEA; 



closed, if a sufficient quantity of rain should fall. M. Desma- 

 rest has often observed branchiopoda in the small standing 

 pools of rain water on the summits of the gres of Fontainbleau. 

 The females of the chirocephali lay sev^eral distinct sets of 

 eggSj after a single coupling, each at several times. These 

 operations last some hours together, and sometimes as long as 

 an entire day. Each laying produces from one hundred to 

 four hundred eggs : they are sent out with much quickness, by 

 casts of ten or twelve, and with sufficient force to sink a little 

 in the mud. 



Benedict Prevost has observed that his Chirocepliale dia- 

 phane was subject to some maladies, the description of which 

 he gives. This species, as we have said, appears to differ but 

 little from our BrancMpe des marais. The two horns situ- 

 ated below the upper antennae are composed, in both sexes, 

 of two articulations, the last of which is large, and arched 

 in the male, very short and conical in the other sex. In the 

 Branchipus stagnalis the horns present but one articulation, 

 and those of the male resemble, in their form, direction, and 

 teeth, the mandibles of the males oi Liicanus cerviis. 



The following have no tail. Their body is terminated 

 almost immediately at the end of the thorax and of the last 

 feet. Such are, 



EuLiMENE, Latr. 



Their body is almost linear, and presents four short antennae, 

 almost filiform, two of which are smaller, and almost similar 

 to palpi, placed at the anterior extremity of the head ; a 

 transverse head, with two eyes supported on peduncles tole- 

 rably large and cylindrical ; eleven pair of branchial feet, of 

 which the first three articulations and the last are smaller, 

 going into a point ; and immediately after them a terminal" 

 piece, almost semi-globular, replacing the tail, and from which 

 issues an elongated filament, which is perhaps an oviduct. I 



