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- W2279286369 abstract "ABSTRACT In the summer of 1894 I received from Mr. Perkins, of Jesus College, Oxford, seven small parasites which he had noticed adhering lightly to the skin around the anus of a species of bird, Hemignathus procerus, which he collected in the island of Kauai, one of the Sandwich Island group. Each of these parasites was divided into three regions,—a head, a collar, and a trunk; and, in fact, they have an almost ludicrous resemblance to a young Balanoglossus with one or two gill-slits (figs, i, n, and m). On investigating their anatomy it at once became evident that the animals belonged to the group Acauthocephala, and, further, that they differed from the other members of the group in the absence of what is perhaps their most characteristic organ,—from which, indeed, they take their name—the hooked proboscis or introvert. The absence of so characteristic a structure, and the fact that the parasites were found outside the body, i.e. not as an endoparasite, but as an ectoparasite, lightly attached to the skin, made me think that perhaps the hooked introvert had been left behind in the intestine of the host, and that the body of the parasite had passed out of the alimentary canal of the bird. However, careful inspection failed to reveal any trace of a scar or mark where the introvert might have been broken off; and although in the absence of hooks and introvert sheath, &c., the anterior part of the body which I have called the head is as unlike the typical introvert as possible, still in its relation to the lemnisci and to the ligament it occupies the position of that organ, and until we can get further information I think the best plan is to regard this part of the body as equivalent to the eversible part of more normal forms." @default.
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- W2279286369 date "1896-08-01" @default.
- W2279286369 modified "2023-10-17" @default.
- W2279286369 title "On Arhynchus hemignathi, a new Genus of Acanthocephala" @default.
- W2279286369 doi "https://doi.org/10.1242/jcs.s2-39.154.207" @default.
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