PHYLLOPOD CRUSTACEANS. 



303 



carapace, the mandibular segment being small and not over- 

 lapping the segments behind it. The second antennas are 



Fig. 248.Lepidurus Couesii, 

 side and dorsal view, natural 

 size. 



Fig. 247. Apus aqualis, natural size. 



large and in the male adapted for 

 clasping. In Thamnocephalus (Fig. 

 250, T. brachyurus Packard, from 

 Kansas) there is a singular shrub- 

 like projection of the front of the 

 head, and the abdomen is spatulate 

 or spoon-shaped at the end. Bran- 

 cMnectes Color adensis Pack. (Fig. 

 251) is a Eocky Mountain form. ?fe- 249.-^, Larva of Apus can- 



7 J cnformts. After Zaddach. 6, 



Ihe brine - Shrimp, Artemia, lives Naupliusof Artemia salina ofEn- 



only in brine-vats or in the salt 



lakes of the West and of Southern Europe. Artemia gra- 



cilis Verrill (Fig. 252) has thus far only been found in tubs 



