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.

    113/146 (page 39)
    Closely reticulated ; sarcode reflected over the shell .. (1.) Gromia. 13 .5 I |o j 1 At one end. (2.) Pleurophrys. £■< ( Finely branched in a bunch < ( At both ends . (3.) Amphitrema. Habitat :—Gromia fluviatilis on Ceratophyllum, G. hyalina (with a short neck) in rivulets. Pleurophrys and Amphitrema in bog-water. (c) Lobosa. Pseudopodia lobose or digitate, simple or dividing. /With a covering or shell o n ' Pseudopodia, fine and sim¬ ple, shell flask-shaped .. l Pseudopodia, stout and di¬ viding . „ Pseudopodium single. Two or three; subtermiual.. Numerous; ter¬ minal . J Shell flask-like . (Shell discoidal... Shell subcubical j(l.) Trinema. ((2-) | J & (Euglypha. l(3-)i (4.) Difflugia. (5.) Arcella. (6.) Cyphidium. 'Naked... Pseudopodia, variable (7.) Am<eba. Habitat:—Trinema acinus and Euglypha tuberculata in stagnant water; Difflugia proteiformis and oblonga amongst Oscillatoriacece; numerous other species in moist moss at the roots of trees; Arcella vulgaris with Lemnce and aquatic plants, A. aculeuta and A. dentuta with Conferva;; Cyphidium aureolum in stagnant water ; Amoeba diffluens on Lemna and A. radiosa in bog-water. (d) Spongida. Spongilla, the only fresh-water genus, occurs in little grey or greenish more or less rigid or friable masses, with a spicular framework. They present a superficial or dermal coat, nume¬ rous inhalant pores, internal ciliated chambers, and an exhalant aperture. Their grey or green colour is due to the amount of chlorophyll taken into the sarcode or soft substance of the sponge. The silicious spicules which are often present in