TEMPORARY POND COMMUNITIES 77 
the ostraccd (Cyprois marginata )(147) (Fig. 129), and the fairy shrimp 
(Eubranchipus) (148) (Fig. 130), all of which are characteristic of tempo- 
rary ponds. Red mites (Fig. 131) are also common (149). 
Professor Child (unpublished) has noted that the distribution each 
spring of Eubranchipus and of other temporary pond species is modified 
TEMPORARY GRASSY POND ANIMALS 
Fic. 127.—A temporary pond copepod (Cyclops viridis americanus Marsh); 35 
times natural size (after Herrick and Turner). 
Fic. 128.—The red copepod (Diaptomus stagnalis) from temporary pond; 12 
times natural size, left antenna omitted (after Herrick and Turner). 
Fic. 129—The temporary pond ostracod (Cyprois marginata); 35 times natural 
size (after Sharp). 
Fic. 130.—The fairy shrimp (Eubranchipus); 3 times natural size. 
Fic. 131.—The red mite (Hydrachna sp.); 10 times natural size. 
by the rainfall of the preceding season. When the rainfall of the pre- 
ceding season has been great, the temporary pond species are found only 
in the smallest and highest (above ground-water) ponds such as would 
