BRANCHIOPODA. 137 



has frequently remarked Branchipi in the little hollows filled with 

 rain water, on the summit of the rocks at Fontainebleau. The fe- 

 male Chirocephalus produces several distinct sets of eggs, after each 

 copulation, at different times, occupying some hours and even the 

 whole clay in the process. Each set consists of from one to four 

 hundred eggs; they are rapidly ejected from the female in jets of ten 

 or a dozen, and with sufficient force to sink them slightly in the mud. 



Benedict Prevost has remarked that the Chir. diaphanus was sub- 

 ject to certain diseases, of which he gives a description. This spe- 

 cies, as we have already stated, does not differ from our Branchipus 

 palustris(l). The two horns, situated under the superior antennae, 

 are composed, in both sexes, of two joints, the last of which, how- 

 ever, is large and arcuated in the male, and very short and conical 

 in the female. In the Branchipus stagnalis(2), the horns consist of a 

 single joint, and those of the males resemble the mandibles of the 

 Lucanus cervus, in their form, dentations, and direction. 



Others have no tail; their body terminates almost directly behind 

 the thorax and last feet. Such is the 



Eulimene, Lat. 



The body of the Eulimenes is almost linear, and has four nearly 

 filiform antennae, two of which are smaller than the others, bear- 

 ing a great resemblance to palpi, and placed on the anterior extre- 

 mity of the head. Their head is transverse, with two eyes seated 

 on large and cylindrical peduncles. There are eleven pairs of bran- 

 chial feet, the three first joints and the last small and tapering; 

 directly after them follows a terminal and nearly semiglobular piece 

 replacing the tail, and from which issues an elongated thread, that, 

 perhaps, is an oviduct. Near the middle of the fifth pair of feet, 

 and of the four following ones, I have remarked a globular body, 

 possibly analogous to the vesicles presented by these organs in the 

 following subgenus. 



The only species known, Eulimene blanch&tre, Lat., Regne 



Animal, Cuv., Ill, p. 68; Nouv. Diet. d'Hist. Nat. X, 333; 



Desmar., Consid. p. 353, 354, is very small; whitish eyes, and 



(1) Cancer paludosus, Mull. Zool. Dan. XLVIII, 18; Herbst, XXXV, 35; 

 Chirocephalus diaphanus? Prev., Journ. de Phys.; Jurhi., Monoc, XX XXII. 

 See Desmar., Consid. LVI, 2 5. This last species is described in the Manuel du 

 Naturaliste of Duchesne under the name of Marteau d'eau douce. 



(2) Branchiopoda stagnalis, Lat., Hist, des Crust, et des Ins., IV, p. 297; Can- 

 cer stagnalis, L. ; Gammarus stagnalis, Fab.; Jipus pisciformis, SchaefF. ; Gammarus 

 stagnalis, Herbst., XXX, 310. 



Vol. III. S 



