1873.] DR. T. S. COBBOLD ON NEW 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 com- 

 munication 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 au- 

 ricles 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 my possession. 



As, in my 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. Swin- 

 hoe'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 refer- 

 ence 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 examina- 

 tion of the specimens supplied by Mr. Swinhoe, to whom I owe an 

 apology for not having made an earlier record of the results. How- 

 ever, 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 me not to delay the publication of these 

 lew microscopic details, since Mr. Swinhoe, in a recent letter, informs 



