. Bulletin - United States National Museum. Science. Fig. 111.—PiNNAXODES CHiLENSis, MALE (22112). a, Endognath of outer maxillipbd, MUCH ENLARGED ; h, ABDOMEN, X 4|. United States National Museum show evidence of parasitization. Verrill says ^ of a collection of 90 specimens of this urchin: An examination of the interior sliowed that in each specimen a crab {Fabia cMlensis) * * * had effected a lodgment in the upper part of the intes- tine, which had thereby been greatly distended in the form of a membranous cyst, attached to one side of the shell and extending around to the lower sur- face n
. Bulletin - United States National Museum. Science. Fig. 111.—PiNNAXODES CHiLENSis, MALE (22112). a, Endognath of outer maxillipbd, MUCH ENLARGED ; h, ABDOMEN, X 4|. United States National Museum show evidence of parasitization. Verrill says ^ of a collection of 90 specimens of this urchin: An examination of the interior sliowed that in each specimen a crab {Fabia cMlensis) * * * had effected a lodgment in the upper part of the intes- tine, which had thereby been greatly distended in the form of a membranous cyst, attached to one side of the shell and extending around to the lower sur- face near the mouth. The shell is usually swollen on the side over the cyst, and the anal area is depressed and distorted, with a large open orifice passing obliquely into the cyst, out of which the crab may thrust its legs at pleasure, but is apparently unable, when full grown, to come entirely out. All the speci- mens examined in the cyst were females, carrying eggs, but a very small crab found clinging among the spines appears to be the male. The crab probably effects an entrance into the intestine through the anus while quite young, and, by its presence and growth in that position, causes the gradual distortion of the shell and formation of the cyst.* Range.—Ecuador to Port Otway, Patagonia. lAmer. Jour. Sci., ser. 2, vol. 44, 1867, p. 126. 2 For further notes on the habits of this species, see Verrill, In Trans. Connecticut Acad. Arts and Sci., vol. 1, 1866, p. 306, and Amer. Nat., vol. 3, 1869, 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 United States National Museum; Smithsonian Institution; United States. Dept. of the Interior. Washington : Smithsonian Institution Press, [etc. ]; for sale by the Supt. of Docs. , U. S. Govt Print. Off.
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