ARTEMIA. 61 



in the water ; and in spring and summer these monltings 

 are of very frequent occurrence, succeeding each other at 

 intervals of five or six days. About iifteen days, or at 

 most three weeks, after the eggs are formed in the ex- 

 ternal ovary, they are expelled, and the mother lays three 

 or four times, the number at each time varying from 160 

 in summer to 50 only in autumn. As is the case with the 

 Chirocephalus, the young present, when first born, a very 

 different appearance from what they assume when full 

 grown (t. II, f. 4). They bear an exact similitude to the 

 young of the Chirocephalus, and the various changes 

 they undergo are precisely the same as those which they 

 experience. 



1. Artemia sauna. Tab. II, figs. 2-4. 



Aktemia salina, Leach, Diet. Sc. Nat., xiv, 524. 



— Desmarest, Cons. gen. Crust., 393. 



— Joli/, Ann. Sc. Nat., 2d series, xii, 225, t. 7, 8. 



— M. Edtmrds, Hist. Nat. Crust., iii, 370. 



— Audouin et Pai/en, Ann. Sc. Nat., 2d series, Zool. 



vi, 219, and x, 315. 



— Latreille, Regne Anim., iv, 174. 



Cancek salinus, Linnmis, Syst. Nat., 10th edit., i, 634 ; 12tli edit., 

 i, 1056. 



— Gmelhi, Syst. Nat., 13th edit., 2993. 



— Rackett, Trans. Linn. Soc, xi, 205, t. 14, f. 8-10. 

 Gammakus SALiNrs, Fabricius, Entomol. Syst., ii, 518. 



— Pennant, Brit. Zool., iv, 22, No. 35. 



— Herbst, Krabben uud Krebse, i, 145. 

 Artemisus salinus, Lamarck, Hist. An. s. Vert., 2d edit., v, 199. 

 Artemis salinus, TJwmpson, Zool. Research., No. 5, 104, t. 1, 



f. 1-10, t. 2. 

 Branchipus salinus, Latreille, Regne An., iii, 68, 1817. 

 Brine-worm, ScJdosser, Observ. period, sur la Physique par Gautier, 



pp. 58-60, i, f. A, B, 1756. 



BescnpHon. — Body linear; nearly half an inch in length. 

 Cephahc horns in male large, flat, and two-jointed, the 

 lower joint carrying a tooth on its inner edge, near the 

 centre. Oviferous sac of nearly a quadrilateral form. 



