. Outlines of zoology. Zoology. ASTEROIDEA. 227 The star-fish may be found with part of its stomach extruded over young oysters and other bivalves. This protrusible or cardiac portion of the stomach is glandular and sacculated, and bulges slightly towards the arms; it is followed by an upper or pyloric portion, giving off five branches, each of which divides into two large digestive. Fig. -Alimentary system of Muller and Troschel. -After The dorsal surface has been removed ; the digestive ceeca and the stomach are shown. To the left lies the intestine ending in the anus. caeca
. Outlines of zoology. Zoology. ASTEROIDEA. 227 The star-fish may be found with part of its stomach extruded over young oysters and other bivalves. This protrusible or cardiac portion of the stomach is glandular and sacculated, and bulges slightly towards the arms; it is followed by an upper or pyloric portion, giving off five branches, each of which divides into two large digestive. Fig. -Alimentary system of Muller and Troschel. -After The dorsal surface has been removed ; the digestive ceeca and the stomach are shown. To the left lies the intestine ending in the anus. caeca,—a pair in each arm (Fig. 99). These glands are comparable to a pancreas; their secretion contains three ferments, which convert proteids into peptones, starch into sugar, and break up fats into fatty acids and glycerine. From the short tubular intestine between the stomach and the almost central dorsal anus two little outgrowths are given off, perhaps homologous with the " respiratory trees ". 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 Thomson, J. Arthur (John Arthur), 1861-1933. Edinburgh, Glasgow and London, H. Frowde and Hodder & Stoughton
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Keywords: ., bookauthorth, bookcentury1800, bookdecade1890, booksubjectzoology
