PHYLLOPOD CRUSTACEANS. 283 
carapace, the mandibular segment being small and not over- 
lapping the segments behind it. The second antennw are 
Fig, 243.—Lepidurus Cowesiz, 
side and dorsal view, natural 
size. 
Fig, 242.—Apus equalis, natural size. 
large and in the male adapted for 
clasping. In Thamnocephalus (Fig. 
245, 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- 
chinectes Coloradensis Pack. (Fig. 
246) is a Rocky Mountain form. . Fig. 244-2, Larva of Apus can- 
. ‘i - é criformis, — After Zaddach. b, 
The brine-shrimp, Artemia, lives Nauplius of Artemia salina of Ew- 
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 
