BIBLIOGRAPHY (No. 22).--_Bastian, H. C._, “On the Anatomy of the Nematoids,” ‘Phil. Trans.,’ 1866, p. 545.--_Bellingham, O. B._, “On the frequency of _Trichocephalus dispar_ in the Human Intestines,” ‘Rep. of Brit. Assoc., in Dubl. Journ.,’ 1838, and in ‘Med. Chir. Rev.,’ 1838; see also Bibliog. No. 33 (and the biography of Bellingham by Dr Mapother, in ‘Dubl. Jrn. Med. Sci.,’ 1877, p. 471).--_Busk, G._, “Anat. of _T. dispar_,” ‘Ann. Nat. Hist.,’ vol. vii, 1841.--_Chiaje_, sul _Tricocephalo disparo_, &c., 1836.--_Cobbold_, ‘Entozoa,’ pp. 69 and 329.--_Idem_, ‘Worms,’ pp. 31 and 67.--_Davaine_, l. c., p. 205.--_Idem_, ‘Compt. Rend.,’ 1858, p. 1217, and ‘Journ. de Physiol.,’ 1859, p. 296.--_Dubini_, ‘Entozoografia umana,’ p. 83.--_Dujardin_, l. c., p. 32.--_Eberth_, “Die Generationsorgane von _T. dispar_,” ‘Sieb. und Köll. Zeitschr.,’ 1860, s. 384.--_Gibson, D._, “On a Case of Paralysis, with loss of speech, from intestinal irritation (produced by _T. dispar_),” ‘Lancet,’ Aug. 9th, 1862, p. 139.--_Goeze_, ‘Naturg.,’ s. 112.--_Gurlt_, ‘Path. Anat.,’ p. 350.--_Küchenmeister_, l. c., s. 235; Eng. edit., p. 321.--_Leidy_, ‘Proc. Acad. Phil.,’ viii, p. 53.--_Leuckart_, l. c., s. 465.--_Mayer_, Sieb. und Köll. ‘Zeitsch. f. wiss. Zool.,’ Bd. ix, s. 367; Bd. x, s. 233, and s. 383, 1858-60.--_Mérat_, ‘Dict. Sc. Méd.,’ p. 560.--_Von Siebold_, ‘Wiegm. Arch.,’ 1845.--_Wilson, E._, ‘The Veterinary Record and Trans.,’ vol. ii, p. 47, 1846. _Filaria Bancrofti_, Cobbold.--The history of the discovery of this entozoon is second only in interest to that of _Trichina spiralis_. Step by step the facts have been evolved by a slow process of observation, and from the data thus afforded a tolerably connected narrative of the probable life-cycle of this entozoon may now be offered. To place matters beyond all doubt much remains to be done; yet that which has been accomplished is, or ought to be, of surpassing interest alike to the physician, the scientific pathologist, the epidemiologist, and the philosophic naturalist. In the case of Trichina, Owen’s nomenclature was most properly allowed to stand; but for reasons stated below I have not hesitated to employ for this worm, in its adult state, a name differing from that originally given to the hæmatozoon which turns out to be its representative larval state. Although the male parasite is at present unknown, the following characters will in the meantime suffice for a diagnosis of the species:--Body capillary, smooth, uniform in thickness. Head with a simple circular mouth, destitute of papillæ. Neck narrow, about one third of the width of the body. Tail of female simple, bluntly pointed; reproductive outlet close to the head; anus immediately above the tip of the tail. Length of largest females, 3-1/2 in.; breadth, 1/90″; embryos, 1/200″ to 1/125″ in length, by 1/3000″ to 1/2250″ in breadth; eggs, averaging 1/1000″ by 1/1650″ from pole to pole.