. A manual of zoology. PHYLUM ECHINODERMATA 161 The dorsal arch is supported by a number of irregular ossicles. The V-shaped ventral part of the body-wall — , the walls of the ambulacral groove — is supported by two rows of elongated ossicles, the ambulacral ossicles (Fig. 88, Amb. os), which meet together at the apex or summit of the groove like the rafters supporting the roof of a house, but with a movable articulation allowing of. Fig. 87. —Starfish. Vertical section through an arm. amp, ampulla; ; ep. epider- mis ; rad. amb, radial vessel of the ambulacral system; s points to the septu
. A manual of zoology. PHYLUM ECHINODERMATA 161 The dorsal arch is supported by a number of irregular ossicles. The V-shaped ventral part of the body-wall — , the walls of the ambulacral groove — is supported by two rows of elongated ossicles, the ambulacral ossicles (Fig. 88, Amb. os), which meet together at the apex or summit of the groove like the rafters supporting the roof of a house, but with a movable articulation allowing of. Fig. 87. —Starfish. Vertical section through an arm. amp, ampulla; ; ep. epider- mis ; rad. amb, radial vessel of the ambulacral system; s points to the septum dividing the blood-vessel into two parts; rad. ne, radial nerve of the epidermal system; sp, spaces in mesoderm of body-wall; , tube-feet. (From Leuckart, after Hamann.) separation or approximation of the two rows so as to open or close the groove. Between the ambulacral ossicles of each row are a series of oval openings, the ambulacral pores, one between each contiguous pair of ossicles. In the ventral groove lie the tube-feet {). Each tube-foot is found to correspond to one of the ambulacral pores. When the tube- foot is drawn upon, it is seen to be continuous with one of M. 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 Parker, T. Jeffery (Thomas Jeffery), 1850-1897; Haswell, William A. (William Aitcheson), 1854-1925. New York, The Macmillan Company; London, Macmillan & Co. ,Ltd.
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