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HISTORY OF BRITISH CRUSTACEA. 
Gen. 144. SID A, Strauss . 
One branch of lower antennae with three joints, the other 
with two joints. 
Sida cry stallin a, Strauss. — Carapace elongate-oval, very 
transparent, truncated at the lower end. 
Hab. Ponds in Northamptonshire and Surrey, and near 
Dublin and Killarney, but not very common. 
Dr. Baird describes its motion through the water as being 
a sort of rapid running movement. He says the animals 
“ are generally inactive, and adhere in a peculiar manner by 
the back of their head to the side of the vessel in which they 
are contained, remaining there for hours.” 
Gen. 145. DAPHNELLA, Baird . 
Lower antennae very large, both branches formed only of 
two joints. 
Dapiinella Wingii, Baird. — Carapace elongated, and of 
a beautiful clear crystalline transparency. 
Hab. Ponds between Twickenham and Whitton, Middle- 
sex, and ditch near Richmond, opposite Isleworth. This 
species was named by Dr. Baird in honour of the late Mr. 
