. Convergence in evolution. Evolution. GIZZARD IN FISHES 109 rather hard at its distal extremity ; in another Clupeoid genus Dussumieria, the pylorus appears as an arched muscular tube lying across the body cavity from left to right, the concavity of the arch being directed forwards (Fig. 9). In a species of Grey Mullet from Ceylon which I identified as Mugil olivaceus Day, I found the gastric coecum rudimentary and the cardiac division of the stomach was followed by a round, white, muscular, bulbous gizzard ; the intestine was full of fine sand ; six pyloric coeca embraced the gizzard; anothe
. Convergence in evolution. Evolution. GIZZARD IN FISHES 109 rather hard at its distal extremity ; in another Clupeoid genus Dussumieria, the pylorus appears as an arched muscular tube lying across the body cavity from left to right, the concavity of the arch being directed forwards (Fig. 9). In a species of Grey Mullet from Ceylon which I identified as Mugil olivaceus Day, I found the gastric coecum rudimentary and the cardiac division of the stomach was followed by a round, white, muscular, bulbous gizzard ; the intestine was full of fine sand ; six pyloric coeca embraced the gizzard; another specimen had only five pyloric coeca. What, however, surprised me very much at the time—and I have not found it mentioned in any work which I have consulted since—was the discovery of an almost precisely similar gizzard in a Clupeoid fish, Chatoessus nastis, which frequents the same ^-r. Gastric [cardiac] , , ccecum. back-waters as the grey mullet, /.f. Pyloric cceca. In this species (C nasus) the ^-Intestine, stomach is frankly destitute of a cardiac coecum, and terminates in a round, muscular, red, bulbous gizzard. In one of the specimens dissected, the gizzard and intestine were full of fine sand as in. Fig. 9. Intestinal tract of Dussumieria. p. 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 Willey, Arthur, 1867-1942. London, J. Murray
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