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Show 124 DR. T. S. COBBOLD ON NEW OR RARE ENTOZOA. [Feb. 3, 2. Notes on Entozoa. Part II. By T. SPENCER COBBOLD, M.D., F.R.S., F.L.S., Lecturer on Parasites at the Middlesex Hospital Medical College. [Eeceived January 2, 1874.] (Plate XVIII.) Whilst engaged in writing the concluding portion of my first set of " notes " I received for examination a nematode parasite, some brief account of which will appropriately commence the present series. 4. FILARIA GRACILIS, Rud. (Plate XVIII. figs. 1-4.) On the 20th of August, 1873, Mr. Samuel Smith, M.R.C.S., of Clifton, transmitted an example of this entozoon, with a request that 1 would identify it. Finding that the specimen was a male and unaware that the males of this species ever attained a length ot 10 inches, I at first supposed that we had to deal with a new torm. However, on subsequently analyzing its characters, I became satisfied that the worm was really only an unusually fine male F. gracilis. The frequency of the occurrence of this nematode in the abdominal cavity and other parts of the trunk of Monkeys is a matter of common observation. I remounted no less than four preparations, representing numerous examples of this Worm, for the Museum ot the Royal College of Surgeons. Some of the Huntenan specimens were originally obtained by Professor Owen from the cavity of the pleura of a Capuchin Monkey, others having been removed by him from the thorax of an Orang-outang. From Mr. Smith I have learnt that the present example formed one of a group of five Worms, all of which were found lying between the folds of the omentum of a Spider Monkey (Ateles). My informant also remarks that one of the Worms was enclosed in a " false sac, formed by a twisting of that portion of the serous membrane which is immediately connected with the inferior curvature of the stomach." It further appears that the example in question was the smallest of the five, although I found it to measure upwards of twenty inches without any stretching. Whilst the Vienna helminthologist, Diesing, only allowed an extreme length of four inches for the male worm, the French authority, Dujardin, stated that specimens had been reported up to a length of 12| inches. Females have been recorded as reaching a a length of 5 feet. Not being acquainted with any satisfactory representation of this Entozoon, I have thrown the parasite into a series of folds so as to enable me to display its full length and general appearance (Plate XVIII. fig. 1). I have also added an enlarged and accurate outline representation of the head and neck (fig. 2). The description of the Worm by Dujardin leaves little or nothing to be desired. Speaking of the tail, he observes that the extremity is furnished with two or three papillae, serially disposed in front of or above the point. I examined |