BIBLIOGRAPHY (No. 32).--_Bavay_, “Sur _l’Anguillule stercorale_,” ‘Comptes Rendus,’ Oct., 1876, p. 694, also in ‘Ann. Nat. Hist.,’ vol. xviii, 4th series, p. 507, 1876, also noticed in the ‘Veterinarian,’ Jan., 1877, p. 19.--_Idem_, “Note sur _l’Anguille intestinale_,” ‘Archiv. de Méd. Nav.,’ July, 1877, p. 64, and in ‘Ann. Nat. Hist.,’ 1877, vol. xix, 4th series, p. 350.--_Cobbold, T. S._, “Parasites of Man,” in the ‘Midland Naturalist’ for January 1st, 1879.--_Davaine_, ‘Traité,’ l. c., 2nd edit., Supp., pp. 966-976, 1877.--_Laveran_, in ‘Gaz. Hebd. de Med.,’ Jan., 1877, p. 42.--_Layet_ and _Le Roy de Méricourt_, in ‘Dict. Encycl. des Sci. Med.,’ 1875.--_Libermann_, in ‘Gaz. des Hôp.,’ March, 1877, p. 237, and in ‘La France Méd.,’ 1877, p. 165 (quoted by Davaine).--_Méricourt_ (see Layet).--_Normand, A._, in ‘Comptes Rendus’ for July, 1876, p. 316, and Aug., 1876, p. 386.--_Idem_, in ‘Arch. de Méd. Navale,’ 1877, p. 35, and separately as ‘Mémoire sur la diarrhée dite de Cochinchine,’ Paris, 1877.--_Idem_, “Du rôle étiologique de l’Anguillule dans la diarrhée de Cochinchine,” in ‘Archives de Médecine Navale’ for September, 1878, pp. 214-224. _Ascaris mystax_, Rudolphi.--This well-known helminth possesses aliform appendages, one on either side of the head. It is of a medium size, the male measuring 2-1/2″ and the female usually 3-1/2″ to 4″ in length. Both as regards the size of the alæ and the length of the body it varies in different hosts. Thus the variety infesting the dog has long been regarded as a distinct species (_A. marginata_), partly from the circumstance that the alæ are less conspicuous, and partly because the individuals are often longer and thicker. I possess one specimen from the dog measuring more than six inches in length. From like causes the _Ascaris leptoptera_ and other varieties infesting the carnivora have been regarded as distinct species, but the worm also varies in one and the same host.