. The Cambridge natural history. Zoology. ASTERIAS SKELETON 435 spines then form a trellis-work covering and protecting the delicate tube-feet; the numerous pedicellariae are then in a position to make it unpleasant for any intruder. The closure of the groove is effected by means of powerful muscles connecting each ambulacral ossicle with its fellow. There are also feebler. ^ 7iiarqinal ^ines ^\ adamln-dacrcd spinos. - sucker, tube fee 0 \ rrvusc. Fig. 187.—A, Asterias rubens, seen from the oral surface, drawn from a living specimen. X 1. B, an adambulaoral spine, showing three straigh
. The Cambridge natural history. Zoology. ASTERIAS SKELETON 435 spines then form a trellis-work covering and protecting the delicate tube-feet; the numerous pedicellariae are then in a position to make it unpleasant for any intruder. The closure of the groove is effected by means of powerful muscles connecting each ambulacral ossicle with its fellow. There are also feebler. ^ 7iiarqinal ^ines ^\ adamln-dacrcd spinos. - sucker, tube fee 0 \ rrvusc. Fig. 187.—A, Asterias rubens, seen from the oral surface, drawn from a living specimen. X 1. B, an adambulaoral spine, showing three straight pedicellariae ; C, a tube- foot expanded and contracted. muscles connecting these plates with their successors and pre- decessors, which enable the arm to be bent downwards in .a vertical plane. It is raised by a muscular band running along the dorsal wall of tlie coelom to the point of the arm. When the series of ambulacral and adambulacral ossicles is followed inwards towards the mouth it is seen that the first 'ambulacral ossicle is closely fixed to the second, but is widely. 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 Harmer, S. F. (Sidney Frederic), Sir, 1862- ed; Shipley, A. E. (Arthur Everett), Sir, 1861-1927. ed. [London, Macmillan and Co. , Limited; New York, The Macmillan Company
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
