REPORT ON THE OSTRACODA. 179 



all bciug tlie same. The sloping dorsal margin of the smaller example, if it be really the 

 young, is only an illustration of what is well known to be a juvenile character in Cyjms 

 and other Ostracoda of both marine and fresh water habitat. 



[PI. XXVI. fig. 7, a-d. a Left valve of full-grown form seen from the side, b shell 

 of young form seen from left side, c from below, d from front. All magnified 60 dia- 

 meters.] 



