Daphnia
a genus of Entomostraca, Entomostraca, pulex is the common water-flea. The head is large, rounded above and in front; front; superior antennæ very small; the DARBHANGAH head produced into a more or less prominent beak: beak; eye spherical, with about 20 lenses; jaws composed of a strong body ending in four horny spines, three of which curve inward. The antennæ act as oars, by which the animals project themselves by a series of jerks through the water. They are frequently very numerous in ponds and ditches, which they often color, especially when the water is stagnant, with an appearance of blood. D. pulex is a favorite and interesting microscopic object. DARBHANGAH (där-bän gä), the chief town of Darbhangah district, in Behar province, India; on the Little Baghmati river, 78 miles N. E. of Patna by rail. It has large bazaars and a handsome market-place, extensive tanks, a hospital and the maharajah's palace, with fine gardens, menagerie, and aviary.
There is an active trade in oil-seeds, food-grains, timber, salt, iron, lime, etc.
Pop. (1901) 66,244.