. A manual of zoology. Zoology. SUMMARY OF IMPORTANT FACTS 309 2. Farther characters are the existence of a coclom, Iheamhulacral system, and the mesodermal spiny skeleton, which has given the name to the phylum. 3. The ambulacral system is locomotor and occurs nowhere else. It consists of a sieve-like madreporite (not always present), which passes water to the stone canal, and from this to the riirg canal and the five radial canals to fill the ampulkc and ambulacra. Lateral branches supply the tentacles and cause their Fig. -Cucumaria frondosa, sea cucumber (from Emerton). 4. Bloo
. A manual of zoology. Zoology. SUMMARY OF IMPORTANT FACTS 309 2. Farther characters are the existence of a coclom, Iheamhulacral system, and the mesodermal spiny skeleton, which has given the name to the phylum. 3. The ambulacral system is locomotor and occurs nowhere else. It consists of a sieve-like madreporite (not always present), which passes water to the stone canal, and from this to the riirg canal and the five radial canals to fill the ampulkc and ambulacra. Lateral branches supply the tentacles and cause their Fig. -Cucumaria frondosa, sea cucumber (from Emerton). 4. Blood-vessels and nerve cords run in the same radii as the radial canals of the ambulacral system; stone canal, madreporite, septal organ and genital ducts are interradial. 5. The Echinoderma are divided into five classes: (i) Asteroidea, (2) Ophiuroidea, (3) Crinoidea, (4) Echinoidea, and (5) Holothuroidea. 6. The Asteroidea have a disc and (usually) five arms into which the gastric pouches and hepatic oeca extend. The ambulacral groove 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 Hertwig, Richard, 1850-1937; Kingsley, J. S. (John Sterling), 1854-1929, ed. and tr. New York, H. Holt
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Keywords: ., bookcentury1900, bookdecade1910, booksubjectzoology, bookyear1912
