Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 FIG. 71.—Diagrammatic represen- tation of the kidney (segmental organs) of a dog-fish embryo (after C. Semper). Wtr, ciliated funnels; Ug, kidney duct. 7> its special coveringsoft and supple. The coccygeal glands of water- birds are derived from an aggre- gation of sebaceous glands; their secretion by keeping the feathers oiled preserves them from becom- ing saturated with water during swimming. The unicellular a
Elementary text-book of zoology, tr Elementary text-book of zoology, tr. and ed. by Adam Sedgwick, with the assistance of F. G. Heathcote elementarytextbo01clau Year: 1892-1893 FIG. 71.—Diagrammatic represen- tation of the kidney (segmental organs) of a dog-fish embryo (after C. Semper). Wtr, ciliated funnels; Ug, kidney duct. 7> its special coveringsoft and supple. The coccygeal glands of water- birds are derived from an aggre- gation of sebaceous glands; their secretion by keeping the feathers oiled preserves them from becom- ing saturated with water during swimming. The unicellular and rnulticell- ular integumentary glands, which are found so widely present in Insects, belong, for the most part, to the category of oil and fat glands. Aggregations of cells whose function is to secrete calcareous matters and pigment are especially widely present in the integu- ment of the Mollusca, and serve for the building up of the beautifully FIG. 72.—Ciliated funnel and Maliughian body from, the anterior part of the kidney of Proteus (after Spengel). Nr, kidney tubule; Tr, ciliated funnel; Mk, Malpig- hian body.
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