PACKARD. ] PHYLLOPODS OF NORTH AMERICA. 329 
Abdomen with nine segments; male claspers simple, cylindrical; ovisac 
Hones Slen@denj: tac). heehee a hula ewe 2 OF a past Branchinecta 
b. Frontal appendages present. 
Frontal appendages ribbon-like, or broad triangular; 2d joint of male 
claspers chitinous, simple, bent at tip -..-........--.--.-- Branchipus 
Second joint of male claspers long, tortuous, and forked irregularly; 
ovisac.lone; andislenderj weniee de saey HHL 92. Sd Ps Streptocephalus 
Frontal appendages long and variously lobed or spinulose; ovisac short 
and broad ......... SRS AI eta gti Sal Ae eveeeesee.se.- Chirocephalus 
Genus ARTEMIA Leach. 
Plates VIII, XXII, XXIII. 
Cancer Linneus, Systema Nat. ed. 12, i, pars. 2, 1056. 
Apus Schaeffer, Monogr. fig. 1, 12, 1754. 
Branchiopoda Lamarck, System. des Anim. sans vert. 161. 1801. 
Branchiopoda Latreille, Gen. Crust. et Insect, i, 22, 1806. 
Eulimine Latreille (pre-occeupied), * 1817. 
Artemia Leach, Dict. des Sc. Nat. xiv; 1819. 
Body very slender, with eleven pairs of feet; the head rather smaller 
in proportion than in the other genera of the family; the male claspers 
(2d antenne) very large, thin, and broad; 2-jointed, the 2d joint bent 
at nearly right angles upon the Ist, the latter thick, about twice as long 
as thick, a deep rounded sinus between the bases of the claspers ex- 
actly fitted so as during connection with the female to enclose her back. 
Near the middle, on the inner side of the 1st joint, a knob-like projection. 
The 2d joint simple, broad, flat, acutely triangular, from 4 to % as broad 
as long. The legs beyond the 5th endite rather slenderer and more 
pointed than in the other genera. The gill is moderately large, about 
half as wide as long; the flabellum broad and rounded, the edge serrate 
and setose as usual. The Ist endite divided into two lobes, the 2d of 
which is about § as long as the Ist; endites 2-4 are minute, conical; 
the 5th is moderately large and rounded on the outer angle, with large, 
coarse sete, the distal edge oblique and somewhat full and rounded; 
the 6th is narrow, long, and more produced and acutely pointed than 
usual, much more so than in Branchinecta or any other genus of the 
family, while the setz are much longer than in Branchinecta. 
Abdomen eight-jointed, very slender, ending in a pair of unusually 
short, small cercopods (caudal appendages) not more than twice as long as 
broad, being Jess than half as long asin Branchinecta, and less than half 
as long as the terminal segment. The male genital deeply cleft, each 
half long and slender, more so than in Branchipus, but somewhat as in 
Branchinecta, though shorter and less curved. Ovisac of the female 
rudely bottle-shaped, shorter and broader than in any of the other 
genera, with a short, broad “neck” or opening. 
Remarks.—This genus is in some respects simpler than Branchinecta, 
or any other genus of the family, and differs decidedly from any other 
genus, not only in the smal! size of the body, but also in the broad, flat, 
triangular 2d joint of the male claspers, as well as in. the much smaller, 
shorter caudal appendages, and the long, narrow, acute distal or 6th 
endites, which render the legs rather long and slender. The ovisac is 
also shorter and broader than usual. 
*According to Dr. Baird (Monograph of the Family Brancbipodide, etc., in Annals 
and Mag. Nat. History, xiv, 216, 1854) the genus Hulimine Latreille, 1817, was based 
on specimens of A. salina, which were badly preserved and erroneously described. 
That name was, however, pre-occupied among Acalephs, see Verrill, Observations, ete. 
