arcuatus_, Koch, _Otonissus aurantiacus_ and _Cerathophyllus octactenus_, both of Kolenati, and _Caris elliptica_. BIBLIOGRAPHY (No. 43).--_Audouin_, ‘Ann. des Sci. Nat.,’ xxv.--_Beneden, P. J. van_, “Les Parasites des Chauves-souris de Belgique,” fr. vol. xl of the ‘Mém. de l’Acad.,’ 1873.--_Diesing_, ‘Syst. Helm.,’ ii, p. 530.--_Dufour_, ‘Ann. des Sci. Nat.,’ 1831.--_Dujardin_, l. c., p. 437.--_Kolenati_, ‘Die Parasiten der Chiropteren,’ 1857.--_Latreille_, art. “Nycteribie,” in ‘Nouv. Dict. d’Inst. nat.’--_Müller_, ‘Zool. Danica,’ ii, p. 43, “_Fasciola vesp._ (syn. _Dist. lima_).”--_Perty_, “Lipoptena,” ‘Del. an. art. Brasil’ (quoted by Westwood).--_Rudolphi_, ‘Synops.,’ p. 117.--_Westwood_, “Mém.,” in ‘Zool. Soc. Trans.,’ 1835.--_Idem_, ‘Modern Classif. of Insects,’ vol. ii, p. 585, 1840.--_Willemoes-Suhm, R. V._, “Helminthologische Notizen,” iii, ‘Zeitsch. f. wiss. Zool.,’ 1873. PART III (INSECTIVORA). The entozoa of insectivorous mammals, though sufficiently numerous, are not important practically. The common hedgehog (_Erinaceus europæus_) is infested by four flukes (_Distoma pusillum_, _D. trigonocephalum_, _D. caudatum_, _D. linguæforme_), and also by three thorn-headed worms (_Echinorhynchus napæformis_, _E. amphipachus_, and _E. major_). Two tapeworms are also known (_Tænia compacta_ and _T. tripunctata_). More attention has been paid to the round worms. A species of strongyle (_S. striatus_) infests the lungs, the male being readily distinguished by its nearly round hood. A second species of strongyle has been mentioned by Diesing, but it is more than doubtful. The lungs are also infested by a small trichosome (_Eucoleus tenuis_ of Dujardin); another species of the genus (_Trich. exiguum_) infesting the stomach and small intestine. As the _Trichina spiralis_ has been repeatedly reared by myself and others in the hedgehog, the little flesh-worm must also be noticed in this place. _Physaloptera clausa_ occupies the stomach, and a minute Ascaris (_A. pusilla_) is found in cysts of the peritoneum. According to Wedl, the intestine of the Egyptian hedgehog (_Erinaceus auritus_) is infested by another worm, which he calls _Pterygodermatitis plagiostoma_. This is allied to Froelich’s genus _Rictularia_. As regards the mole (_Talpa europæa_), two flukes have been described (_Distomum flexuosum_ and _Monostomum ocreatum_), also two round worms, namely, _Ascaris incisa_, occupying the peritoneum, and _Spiroptera strumosa_ in the cavity of the stomach. Dr Schneider places the latter with the Filariæ. A little tapeworm (_Tænia bacillaris_) infests the small intestines, and a larval cestode occupies the liver and subcutaneous connective tissues. This is the well-known _Cysticercus talpæ_, which Leuckart and others have referred to as being the scolex or juvenile state of _Tænia tenuicollis_ infesting weasles (_Mustelidæ_). The Cysticercus is also found in _Arvicola arvalis_.