. The Cambridge natural history. Zoology. 468 ECHINODERMATA—ASTEROIDEA immediate contact with the adambulacral, whilst in Luidia it is separated from it by a small intermediate plate. Astropecten irregularis is a very common species on the coast of Britain, and a study of its habits when in captivity has thrown a great deal of light on many obscure points in the anatomy of the Paxillosa. Owing to the loss of suckers it is. Fig. 201.—Oral view of Archaster bifrons. x |. (From Wyville Thomson.) unable to climb over rocks and stones like the ordinary species, but it runs over the surface of the h
. The Cambridge natural history. Zoology. 468 ECHINODERMATA—ASTEROIDEA immediate contact with the adambulacral, whilst in Luidia it is separated from it by a small intermediate plate. Astropecten irregularis is a very common species on the coast of Britain, and a study of its habits when in captivity has thrown a great deal of light on many obscure points in the anatomy of the Paxillosa. Owing to the loss of suckers it is. Fig. 201.—Oral view of Archaster bifrons. x |. (From Wyville Thomson.) unable to climb over rocks and stones like the ordinary species, but it runs over the surface of the hard sand in which it lives by means of its pointed tube-feet. The arms are highly muscular, and the animal when laid on its back rights itself by throwing the arms upwards and gradually overbalancing itself. The loss of suckers has also rendered Astropecten and its allies incapable of feeding in the manner described in the case of Asterias ruhens. They are unable forcibly to open the valves of shell-fish, and the only resource left to them is to swallow their prey whole. The mouth is consequently wide, and 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 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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