A guide to the microscopical examination of drinking water / by J.D. Macdonald.

  • MacDonald, J. D.
Date:
1875
Catalogue details

Licence: Public Domain Mark

Credit: A guide to the microscopical examination of drinking water / by J.D. Macdonald. Source: Wellcome Collection.

    126/146 (page 52)
    A single eye. 2. Branchiopoda. (a) Phyllopoda. Legs from 11 to 60 pairs; joints foliaceous, branchiform. Body • Families. Naked... Branchiopoda Illustrative Genera. Artehia. Tail simply bifid. Tail in two distinct pieces (1.) Branchipus, In a shell Aspidephora. (2.) Apus. Habitat:—Respectively in saltpans, ditches, and pools. (b) Cladocera. Body included in a pseudo-bivalve carapace. Legs, 5 or 6 pairs. Families. Illustrative Genera. fle-s j (?•) Daphnella. 2 & 2 jointed' , . .. . , ,, , , 6 pairs 1 (8.) Sida . 3 & 2 jointed intestine simple no black } Baphnidce spot m front of the eye ...J r ((5.) Daphnia .j be»s’ r 4 &3 jointed pairs ^ b08MINA .j Intestine convoluted, a black 1 j-/Legs, V spot in front of the eye ... J ^ l 6 pairs -3 & 3 jointed ° H < (1.) Chtdohxts .\ (2.) Camptoceecus . (3.) Alona . \ (4.) Pleuboxus Habitat.:—In ponds, ditches, tanks, and reservoirs ; usually in good water. B. Malacostraca. (Plate XXf) a. Edriophthalmata. (a) Isopoda. (1) Asellus aquations appears to be the only fresh-water lsopod. Its distinguishing features are the following:— Superior antennsc, at least as long as the peduncle of the inferior ones. The seven pairs of legs of the order, with the terminal hooks entire ; and two bifid needle-like processes at the posterior extremity of the body.