The Canadian journal of industry, science and art . 26 A POPULAR EXPOSITION OF THE. Fig. = MaBnified Specimen. Cyproids, or Bivalve Entomostracans.—The crustaceans of thisorder are more or less minute forms, partly inhabitants of the sea, orof brine solutions, and partly of fresh water. The existing marinetypes belong mostly to the genus Cythera orCytherina: the others to the genus Cypris-In each, the form is closely alike ; and in fossilspecies the one is scarcely to be distinguishedfrom the other, except by its associated living forms, the minute animal is seen topossess a
The Canadian journal of industry, science and art . 26 A POPULAR EXPOSITION OF THE. Fig. = MaBnified Specimen. Cyproids, or Bivalve Entomostracans.—The crustaceans of thisorder are more or less minute forms, partly inhabitants of the sea, orof brine solutions, and partly of fresh water. The existing marinetypes belong mostly to the genus Cythera orCytherina: the others to the genus Cypris-In each, the form is closely alike ; and in fossilspecies the one is scarcely to be distinguishedfrom the other, except by its associated living forms, the minute animal is seen topossess a delicate bivalve shell, with curioustufted feet and antennae, which it projectsbeyond the shell when swimming. Theselittle crustaceans occur in rocks of all ages,and much resemble, in the fossil state, small scattered grains or seeds(fig. 137). The shell is frequently brown and lustrous, and usuallyoval or semi-circular in shape. Canadian genera (Organic Remains,Decade IV.,) have been referred to Beyrichia, Leperdita, &c., buttheir characters are quite microscopic and more
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