. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. ORGANIZATION" AND DEVELOPMENT OF ANIMALS IN GENERAL. the red colouring matter of the blood, haemoglobin, which plays so important a part in respiration. They arise in all probability from the colourless corpuscles which are always far less numerous in normal blood. The coloui-less corpuscles are genuine cells of variable form, and have the power of amreboid motion (migration into tissues, regeneration of tissues, etc.) ; they come from the lymphatic glands, in which they arise as lymph
. Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote. ORGANIZATION" AND DEVELOPMENT OF ANIMALS IN GENERAL. the red colouring matter of the blood, haemoglobin, which plays so important a part in respiration. They arise in all probability from the colourless corpuscles which are always far less numerous in normal blood. The coloui-less corpuscles are genuine cells of variable form, and have the power of amreboid motion (migration into tissues, regeneration of tissues, etc.) ; they come from the lymphatic glands, in which they arise as lymph corpuscles, and eventually pass with the lymph stream into the blood. The ova and sperniospores, after. FIG. 20.—Spermatozoa, a, ct Medusa. 6, of a Nematode. c, of a Crab, d, of Torpedo. e, of Salamander (with undulating membrane). /, of Frog, g, of a Monkey (Cerco- pithecus). they have separated from the epithelial layer in the wall of the ovary and testis, as well as the spermatozoa produced from the sperniospores, respectively belong to the category of free cells. The form and size of the spermatozoa present great variations. They always consist of a modified cell, frequently of a very small cell with a long nagellum, nucleus, and remains of protoplasm. Ill many cases the head is elongated into a fibre-like structure, or is twisted like a corkscrew (Birds, Selachians). Sometimes a distinct head is absent, and the spermatozoon is thread-like (Insects). In the Nematodes the sperm-. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Claus, Carl, 1835-1899; Sedgwick, Adam, 1854-1913; Sinclair, F. G. (Frederick Granville), b. 1858. London, Swan Sonnenschein & co.
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