BIBLIOGRAPHY (No. 44).--_Leidy_, “_S. scalopsis canadensis_,” ‘Proc. Phil. Acad.,’ 1851, p. 156.--_Linstow_, “_D. cordatum_, Einige neue Distomen (u. s. w.),” ‘Arch. für Anat.,’ 1873, s. 95.--_Molin_, ‘Una Monografia del genere Physaloptera,’ Wien, 1860 (p. 7, “_P. clausa_,” and p. 31, “_P. limbata_”).--_Idem_, ‘Nuovi myzelmintha,’ Wien, 1859, p. 10, Spec. No. 8.--_Idem_, ‘Una Monogr. del genere Spiroptera,’ Wien, 1860, p. 25, Spec. No. 22.--_Schneider_, ‘Monogr. der Nematoden,’ Berlin, 1866, s. 103, Spec. No. 39.--_Stieda_, in ‘Troschel’s Archiv,’ 1862, “Description and figs. of _Tænia uncinata_ and _T. furcata_ of the Shrew.”--_Thomson_, art. “Ovum,” in ‘Todd’s Cyclop. of Anat. and Phys.,’ contains figs. and description of _T. pistillum_ (from Dujardin), vol. v, p. 28.--_Villot, A._, “On the Migrations and Metamorphoses of the Tapeworms of the Shrews,” in ‘Ann. of Nat. Hist.,’ March, 1878, from ‘Comptes Rendus,’ Nov. 19, 1877, p. 971.--_Wedl, K._, “Zur Helminthenfauna Ægyptens,” ‘Sitzungsb. d. math.-naturw. Classe’ (u. s. w.), Bd. xliv, Abth. i, s. 464. PART IV (CARNIVORA). Notwithstanding the importance of the entozoa of this large section of mammals, I must deal with them very summarily, emphasising my remarks on the parasites of the dog and cat. Only a few of the ectozoa can be noticed. The bears are much infested by nematodes, the species being _Ascaris transfuga_ and _Spiroptera_ (_Gongylonema_) _contorta_ of Molin. The latter is found in the œsophagus. Immature round worms have also been found in cysts. These were erroneously described as cestodes by Zeder and Gmelin. The bear, however, is very liable to be infested by genuine Cysticerci. Retzius found them in the muscles, and they are described as examples of the ordinary hog-measle. The museum attached to Guy’s Hospital contains the heart of a bear which is largely infested by Cysticerci. A species of tapeworm has been found in the polar bear. The coati (_Nasua narica_) is infested by _Ascaris brachyoptera_ in the intestine, by Molin’s _Physaloptera semilanceolata_ from the stomach, by _Echinorhynchus spirula_, _Tænia crassipora_, and _Ligula reptans_, the latter occupying the muscles. A second species of Ascaris (_A. alienata_) is described from _Nasua rufa_.