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F. CHAPMAN—OSTRACODA FROM HITCHIN. 
Candona Candida (0. F. Muller).—This species is very common in 
ponds and ditches. As a fossil it is known from the Weybourn 
Crag and from most deposits of post-Pliocene age. It is common 
at Hitchin. 
Candona Candida , var. tumida, Brady & Bobertson. — This 
variety has been found commonly in rivers and dykes subject to 
tidal influence. It differs from the typical form, so common in 
fresh water, in the shortness and the tumidity of the carapace. 
Another distinguishing character is the rosette-like arrangement 
of the muscle-spots, and this is clearly seen in at least one of the 
valves from Hitchin, where the variety is somewhat rare. 
Candona Candida , var. claviformis , Brady & Norman. — This 
variety has been taken in the living condition from canals and 
ponds. It is not unfrequent in the Pleistocene of Hitchin. 
Family Darwinulidjs. 
Darwinula Stevensoni , Brady & Bobertson. — It is of much 
interest to note the occurrence of this species from Hitchin, since 
in the living state it is a characteristic form in the East Anglian 
Fen district; and it is also found in rivers, lochs, and canals in 
various parts of the British Islands. Several separate valves were 
found at Hitchin. 
Family Cytherid^;. 
limnicythere inopinata (Baird). — This species is now found 
inhabiting ditches, lakes, and slowly-running streams. It has 
been recorded from various post-Tertiary clays of Scotland and 
England. It is of frequent occurrence in the fresh-water bed of 
Hitchin. 
For valuable help in the writing of this account I tender my 
sincere thanks to Professor Bupert Jones. 
