. A text-book of agricultural zoology. Zoology, Economic. 30 ECHINODERMATA. EOHINODEBMS. Starfish, Sea-urchins, and Sea-cucumbers are united into one known as the Echinodermaia. All these animals are marine. They are characterised by their radial symmetry. They have generally a hard calcareous exoskeleton, which may bear calcareous spines. Within the tests are placed the fuUy developed alimentary canal, and the water-vascular and reproduc- tive organs. The starfish, &c., reproduce sexually. The ova produced give rise to curious larval forms, quite unlike the adult. The group must be summar
. A text-book of agricultural zoology. Zoology, Economic. 30 ECHINODERMATA. EOHINODEBMS. Starfish, Sea-urchins, and Sea-cucumbers are united into one known as the Echinodermaia. All these animals are marine. They are characterised by their radial symmetry. They have generally a hard calcareous exoskeleton, which may bear calcareous spines. Within the tests are placed the fuUy developed alimentary canal, and the water-vascular and reproduc- tive organs. The starfish, &c., reproduce sexually. The ova produced give rise to curious larval forms, quite unlike the adult. The group must be summarily dismissed here, as they are of no. Fig. 6.—The Common Starfish (f/rosterrMbens). From Nicholson. importance to the agriculturist, except in the case of the starfish (fig. 6), which are sometimes employed as manure, the so-called " five-finger " manure, in neighbourhoods near the 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 Theobald, Frederick Vincent, 1868-1930. Edinburgh and London, W. Blackwood and sons
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1899
