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Show 1868.] DR. J. MURIE ON THE WALRUS. 69 On opening the stomach, which was of moderate size, I was much surprised to find that it contained small round Worms, a species of Ascaris, in such quantities that, when these were turned out, there was altogether about half a pailful. They occupied the entire interior of the viscus, but were in greatest abundance at the bend of the peculiar siphon-like stomach. The Entozoa swarmed between the rugee, and in many cases were firmly attached to the membrane. The mucous membrane lining the interior was of an intense red hue ; but here and there were somewhat paler patches. More rigid examination showed that these last were extensive ulcerations, the mucous membrane being entirely eroded, and only the muscular and a very thin lining of submucous tissue remained, preventing perforation of the walls of the stomach. The chief ulcerations were some four in number, and varied in size and situation. One, nearly circular, f of an inch in diameter, occupied the anterior wall at a distance of between 5 and 6 inches from the cardiac end. Another, somewhat diamond-shaped, 2\ inches by 1| at widest, also existed on the anterior wall of the viscus and about its middle. In this ulcerated erosion, the mucous coat was in some parts so excavated underneath as to leave | inch of an overhanging lappet of membrane. On a section being made vertically, the submucous tissue was seen to be absent, the muscular and serous coats alone preventing perforation of the wall. At this part the wall of the stomach had a thickness of only 0*1 of an inch, although it seemed as if the muscular fibres were slightly increased in numbers here, possibly from the effects of the irritation going on in the neighbourhood and within. A third ulcer, of an elliptical form, 2\ inches long, and with more regular edges than the preceding, had been eaten away on the anterior wall, close to the lesser curvature of the stomach and between 5 and 6 inches from the pylorus. Between the second and third erosions here described, but upon the posterior wall of the stomach, another very extensive patch of ulceration had taken place. This ulcer stretched between the greater and lesser curvatures. It had a semilunar figure, was rather more than 4 inches long, possessed irregular borders, and varied from half to one inch in width. The mucous coat around had been undermined in a manner similar to that described above as occurring in the second ulcer. To the right and lying parallel with this large excavation were a series of small circular and ovoid spots, which had been eroded in like manner with those already described. The spots just spoken of varied in size from about a threepenny piece to a shilling, and they evidently were fast running into one single long ulcer, resembling that upon their left side. Only a very few Worms were found here and there in the intestinal tract; some were observed to have passed previously to the horse-fat having been given. Dr. Baird, of the British Museum, having examined some of the Entozoa, considers them new to science, and sufficiently different to require a new specific name. He has proposed, therefore, that of Ascaris bicolor, on account of a peculiarity common to most of |