. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Entozoa from the Murman Coast. 509 while it is readily distinguished from M. macracanthum, Fuhrm., by the much smaller size of its hooks. Both these species occur in closely related hosts. MonopyUdium stercorarium, sp. n. (Figs. 5-7.) Host: Stercorarius pomarinus (pomatorhine skua). Yu- kanski, 22. vi. 1917. This is a comparatively short worm, measuring 2*5-3 cm. in length. The maximum width is about 0*8 mm. (near the posterior end). The number of segments is rather small (abo
. The Annals and magazine of natural history; zoology, botany, and geology. Natural history; Zoology; Botany; Geology. Entozoa from the Murman Coast. 509 while it is readily distinguished from M. macracanthum, Fuhrm., by the much smaller size of its hooks. Both these species occur in closely related hosts. MonopyUdium stercorarium, sp. n. (Figs. 5-7.) Host: Stercorarius pomarinus (pomatorhine skua). Yu- kanski, 22. vi. 1917. This is a comparatively short worm, measuring 2*5-3 cm. in length. The maximum width is about 0*8 mm. (near the posterior end). The number of segments is rather small (about ninety). Fig. 5. Fig-. 50/J Fig. 5.—MonopyUdium stercorarium ; the scolex. Fig. 6.—Ditto ; hook from the rostellum. The scolex (fig. 5) measures about 04 mm. across, and the suckers are 0'18 mm. in diameter. The rostellum is rather long and stout, and is armed with a single crown of fourteen (?) very large hooks, 110 /j, in length (fig. 6). The long roots of the hooks meet at the apex of the rostellum. [Segmentation begins immediately behind the scolex. The anterior segments are broader than long ; soon, however, they become squarish, and posteriorly they are much longer than broad. Rudiments of genital organs begin to appear at. 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 London, Taylor and Francis, Ltd
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