PHTLLOPOD CRUSTACEANS. 



283 



carapace, the mandibular segment being small and not over- 

 lapping the segments behind it. The second antennae are 



Fig. 243.L?}ridtirvs Coue&ii, 

 side and dorsal view, natural 

 size. 



Pig. 242. Apus cequalte, natural size. 



large and in the male adapted for 

 clasping. In Thamnocephalus (Fig. 

 245, T. Iracliyurus 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. 

 :246) is a Eocky Mountain form. Fig. 244.-*, Larva of Apm can- 



m, , . , . , . cnformls. After Zaddach. b, 



Ihe brine - Shrimp, Artemia, lives Naupliusof ArtemiasalinaofEn- 



only in brine-vats or in the salt 



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



cilis Verrill (Fig. 247) has thus far only been found in tubs 



