a long letter appeared in the ‘London Medical Record,’ in which Dr Maddox showed that he was much vexed that I should have “impugned” the “accuracy of his conclusions.” He defended his position with the support of no less an authority than Dr Macdonald, F.R.S., the distinguished Assistant Professor of Naval Hygiène at the Victoria Hospital, Netley. Dr Maddox says:--“We were quite alive to the anomalous position. Hence the exceptionability of the case rests on more than my own evidence.” In regard to this unfortunate dispute I will only add the expression of my conviction that Drs Maddox and Macdonald will eventually become satisfied that no cestode scolex is capable of displaying either mature or immature ova in its interior. BIBLIOGRAPHY (No. 15). _Cobbold_ (l. c., _supra_), 1865-75.--_Idem_, “On Measly Meat, &c.,” the ‘Veterinarian,’ Dec., 1876.--_Idem_, “The Mutton Tapeworm (_T. tenella_),” No. 16 in my revised list of Entozoa, the ‘Veterinarian,’ Dec., 1874.--_Diesing, C. M._ (_Tænia tenella_, Pruner nec Pallas), in “Revis der Cephalocotyleen,” ‘Sitzungsb. der Math.-Mat. Class d. k. Akad. der Wissenschaften,’ Bd. xlix, s. 369, 1864.--_Maddox_ (l. c., _supra_), 1873.--_Mayrhofer, J. C._, ‘Die helminth. des Menschen,’ Erlangen, 1854.--_Pruner_, ‘Krankheiten des Orients,’ s. 245, 1847. _Tænia lophosoma_, Cobbold.--This is a good species notwithstanding the doubts that have been expressed by Heller and others regarding it. I have called it the ridged tapeworm in consequence of the presence of an elevated line coursing the whole length of the body, which measures about eight feet. The reproductive papillæ are remarkably prominent and uniserially disposed throughout the entire chain of proglottides. It is quite an error to suppose that this species is a malformed cestode, or that it has any resemblance to Küchenmeister’s variety of tapeworm from the Cape of Good Hope. Neither does it in the slightest degree resemble the remarkably malformed _T. mediocanellata_ described by Mr Cullingworth. Of the distinctiveness of this parasite as a species, any one may satisfy himself by an inspection of the nearly complete strobile preserved in the Pathological Museum attached to the Middlesex Hospital Medical College. From the examination of several mature proglottides detached from this specimen, I find their average breadth to be one fifth of an inch, by three quarters of an inch in length. Their greatest thickness does not exceed the 1/13th of an inch. The eggs resemble those of other tapeworms, and offer a diameter of about 1/850″ from pole to pole. BIBLIOGRAPHY (No. 16).--_Cobbold_, “Parasites of Man,” in the ‘Midland Naturalist,’ April, 1878, p. 98.--_Idem_, ‘Tapeworms,’ 1st edit., p. 52, 1866; 3rd edit., p. 27, 1875.--_Cullingworth_ (see Bibl. No. 18).--_Davaine_, ‘Les Cestoïdes,’ l. c., p. 573.--_Heller_, l. c., s. 594.