PHTLLOPODA 



331 



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

 second antennae flat and triangular; 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 gracilia 



(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. : 



western America, abundant in Kansas. 



Apus lucasanus 

 (Packard). 



FAMILY 3. LIMNADIIDAE. 



Body elongate and entirely enclosed in an oval laterally compressed 

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



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

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



