PHTLLOPOD CRUSTACEANS. 



303 



carapace, the mandibular segment being small and not over- 

 lapping the segments behind it. The second antenna? are 



Fig. %&.Lepidurns Conesii, 

 side and dorsal view, natural 



Fig. 247. Aims cequalin, natural size. 



large and in the male adapted for 

 clasping. In ThamnocepJialus (Fig. 

 250, T. bracliyurus 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- 

 cliinectes Coloradensis Pack. (Fig. 



251) is a Eocky Mountain form. Fig- 249.- Larva of Apnscan- 

 ' , , J . cnformis. After Zaddach. b, 



The brine - shrimp, Artemia, lives Naupiius of Artemia saima of EU- 

 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 



