PHYLLOPODA 



331 



3. Artemia Leach. No frontal appendages present; second joint of 

 second antennae flat and trianj^ular; abdomen of 8 segments and with 2 

 very short caudal projections; egg sac short: several 



species, all in salt pools and lakes ; 2 American species. 



A. gracilis Verrill (Fig. 509). Body semitranspar- 

 ent, pink or green in color, 10 mm. long: eastern and 

 central North America, as far west as Great Salt Lake. 



A. franciscana Kellogg. Body translucent whitish 

 or dull brick red in color and slender ; length 13 mm. ; 

 caudal appendages with setose edges: California. 



4. Branchinecta* Verrill. No frontal append- 

 ages between second antennae, the second joint of 



I which is simple and slender; ab- 



domen of 9 segments; egg sac 

 long and slender: 3 species, in the 

 western states. 



B. coloradensis Packard (Fig. 510). Length 18 

 mm.; second antennae large, and broad and bent in, 

 and not serrate: very common in Colorado. 



Fig. 509 

 Artemia gracilis 



(Packard). 



1, first antenna 



2, second antenna 



3, ovisacs 



Fig. 510 



Branchinecta 



coloradensis — 



front view of head 



of male (Shantz). 



1, first antenna 



2, second antenna 



Family 2. APODIDAE. 



Body elongate and composed of many segments, 

 and with an oval, low-arched carapace covering the 

 head and thorax; eyes sessile; first antennae short and 

 filiform with 2 or 3 flagella; second 

 antennae minute or wanting in the 

 adult; 40 to 60 pairs of broad feet, the first pair end- 

 ing with 3 long, slender branches, the eleventh pair 

 forming egg capsules in the female; 2 long caudal 

 bristles; larva a nauplius: 2 genera; in fresh water. 

 Apus Schaeffer {Triops Schrank). With the 

 characters of the family: about 4 American species, 

 all in the western states. 



A. lucasanus Packard (Fig. 511). Telson with 

 3 central spines; length, with caudal bristles, 41 mm.: p.^ r^^^ 



western America, abundant in Kansas. ^(pfckanfr*"* 



Family 3. LIMNADIIDAE. 



Body elongate and entirely enclosed in an oval laterally compressed 

 carapace, which gives the animal the appearance of a bivalve moUusk; 



* See "Notes on the North Am. Species of Branchinecta," etc., by H. L. Shantz, 

 Biol. Bull., Vol. 9, p. 249, 1900. 



