The Opisthobranchiate M̲o̲l̲l̲u̲s̲c̲a̲ of the Branner-Agassiz Expedition to Brazil No. 2
The Opisthobranchiate M̲o̲l̲l̲u̲s̲c̲a̲ of the Branner-Agassiz Expedition to Brazil No. 2
Frank Mace Macfarland
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in width as it passes through the nerve collar, and extends back- ward, below the viscera ventrally, for about one-half the total length of the animal. Esophagus, stomach and intestine. The esophagus is short and wide, ca. 3.0 mm. long by 1.5 mm. in diameter, passing directly downward and backward to the stomach, into which it dilates. The latter organ lies in a deep notch in the anterior face of the DISCODORIS BRANNERI MAC FARLAND 69 posterior visceral mass. It describes a C shaped loop upon i...tself, the pyloric end lying almost directly above the anterior portion. The anterior half of the intestine is large and dilated, being about ii.o mm. long by 2.0 mm. in diameter. It courses obliquely upward and backward in a deep groove in the upper right side of the visceral mass, constricts suddenly to 0.5 mm. in diameter, and continues for about ii.o mm. to the anal opening, situated at the summit of the anal papilla, in the center of the branchial circle. Liver. The liver is of the usual Dorid form, bluntly conical, the apex lying posteriorly beneath the branchiae, the anterior end divided by a deep median groove into right and left lobes, between which the stomach is inclosed.
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