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Show 1873.] DR. T. S. COBBOLD ON N E W OR RARE ENTOZOA. 739 of a dog, the animal, according to the statements of the donor, having died at Shanghai in the spring of the year, " after three days of great suffering." During the month of February 1872 I also received, through Mr. Walsh, a second preparation of the heart of a dog which had died at Yokohama, Japan, under similar circumstances. This second specimen was transmitted by Mr. Dare, together with a communication which was published in the pages of the 'The Field' for February 24, 1872. In both cases the Filaria immitis appears to have been the sole cause of the death of the dogs in question, the ventricles and auricles being completely blocked by the presence of a large number of these worms. To Prof. Bennett of Edinburgh I am also indebted for a single specimen taken from another Chinese dog, the original preparation of the heart, as I saw it in 1850, resembling in all respects the specimens which I have now in m y possession. As, in m y recently published ' Manual of the internal Parasites of our domesticated Animals,' I have already enlarged upon the symptoms produced by this parasite, and upon other practical points gathered from the statements of Mr. Dare, Dr. Lamprey, and others, I am here only concerned to add such scientific details as could not be published at any length in that small treatise. In the interval which elapsed since the transmission of Mr. Swinhoe's contributions similar specimens of the worm were received at Netley and at the British Museum from Dr. Jones Lamprey. In the first instance they were briefly and very inadequately noticed by the late Dr. Baird in a paper communicated to the Linnean Society (May 2nd, 1867); but they have since supplied materials for the publication of an admirable paper by Assistant Prof. Welch of Netley ('Lancet,' March 8, 1873). Although Mr. Welch's paper leaves little to be desired in reference to the facts of embryonal development, as far as can be gathered by an examination of the uterine contents of the female worm, yet there are some points well worth verifying in this matter ; and there are others in connexion with the structure of the adult worm which appear to have escaped Mr. Welch's attention as well as Dr. Baird's. Unfortunately, I have had no opportunity of consulting the original paper by Dr. Joseph Leidy. As regards the specific name, for which, I believe, Dr. Leidy is responsible, nothing could be more to the point, as the term immitis expresses, metaphorically, the truly cruel character of the Entozoon. Most of the following data have been gathered from an examination of the specimens supplied by Mr. Swinhoe, to whom I owe an apology for not having made an earlier record of the results. However, the dog's heart was exhibited at the Liverpool Meeting of the British Association in 1870 ; and a brief notice of it subsequently appeared in the published Reports of the Meeting for that year. It is the more incumbent upon m e not to delay the publication of these few microscopic details, since Mr. Swinhoe, in a recent letter, informs 47* |