daphne tin (dafnetin)

[ IMG:content-2040.jpg:[merged small][ocr errors] IMG:content-2041.jpg:[ocr errors] st C ms Side View of Water-flea ( Daph nia), one of the cladocerous Branchiopod a , highly magnified: the appendages no excepting II , antennule; IV , mandible; 1, compound eye; I ", simple eye; x , shell-gland; cs , cep halo ste gite, separated at st , cervical depre ion, leigumandible; from ms, omostegite; 16, c, heart. phnida hand family Daphniidæ, and repre sentative of the whole order Daphniacea or Cladocera. The species are among the many small crustaceans known as wa ter-fleas. The best-known species is D. pulex, the "branch-horned" water flea, which is a favorite microscopic object. The head is prolonged into a snout, and is provided with a single central compound eye; it is also furnished with antennæ which act as oars, propelling it through the water by a series of short springs or jerks. These animals are very abundant in many ponds and ditches; and as they as sumeared color in summer, the swarms which abound in stagnant water impart to it the appearance of blood. Daphniacea (daf-ni-a'sē-ä), n. pl. [NL.,