BIBLIOGRAPHY (No. 8).--_Bilharz_, “Beitrag zur Helminth. humana,” ‘Zeitsch. für wissenschaftl. Zool.,’ s. 62, 1851.--_Cobbold_, ‘Entozoa,’ p. 195, 1864.--_Küchenmeister, F._, ‘Parasiten,’ 1855, s. 210, Eng. edit., p. 276, 1857.--_Leared_, “Description of _Distoma constrictum_,” ‘Quarterly Journal of Micros. Science,’ new series, vol. ii, 1862.--_Leuckart, R._, l. c., s. 613, 1863.--_Moquin-Tandon_, on the Genus _Fasciola_, l. c., 1861.--_Weinland_, on _Dicrocœlium_, l. c., p. 86, 1858. _Distoma ophthalmobium_, Diesing.--There is every reason to believe that the small flukes found by Gescheid and Von Ammon in the human eye were sexually immature worms, but since it cannot be decided as to what adult species they are referable I prefer to notice them under the usual title. Possibly these eye-worms may be referred to _D. lanceolatum_, as suggested by Leuckart. However that may be, I deem it unnecessary to repeat the details recorded in the treatises quoted below. The largest examples measured only half a line or about one millimètre in length. [Illustration: FIG. 5.--The eye fluke (_Distoma ophthalmobium_). Showing the suckers and intestinal tubes. After Von Ammon.] BIBLIOGRAPHY (No. 9).--_Cobbold_, ‘Entozoa,’ p. 191.--_Gescheid (D. oculi humani)_, in Von Ammon’s ‘Zeitsch. f. Ophth.,’ iii, and also in Ammon’s ‘Klin. Darstell. d. Krankheit d. Menschl. Auges.,’ vols. i and iii.--_Küchenmeister_, Eng. edit., p. 287.--_Leuckart_, l. c., s. 610.--_Nordmann (Monostoma lentis)_, “Mikr. Beitr.,” Heft. ii, ‘Vorwort,’ s. ix, 1832. _Tetrastoma renale_, Chiaje; _Hexathyridium pinguicola_, Treutler; and _H. venarum_, Treutler.--Whether these forms are good species or not, the fact that they were genuine parasites cannot, I think, be disputed. The first-mentioned measured five lines in length, and was found by Lucarelli in the urine. The second, eight lines long, was found by Treutler in a small tumour connected with the ovary. The third, measuring three lines in length, was twice found in venous blood, and twice in the sputum of patients suffering from hæmoptysis. BIBLIOGRAPHY (No. 10).--_Delle-Chiaje_, ‘Elmintografia Umana,’ 1833.--_Bremser_ (l. c., Bibl. No. 2), s. 265, 1819.--_Cobbold_, ‘Entozoa’ (p. 204, et seq.).--_Dujardin_ (l. c., Bibl. No. 2), s. 265, 1819.--_Treutler_, ‘Obs. Path. Anat. ad Helm. Corp. Humani,’ p. 19, 1793.--_Zeder_, ‘Anleitung zur Naturg. der Eingeweidewürmer,’ s. 230, 1803.