[Hamidaria lymp)hatica, Treutler - H. sub-compressa B., once seen by Treutler in a degenerated bronchial gland in the human subject.] Filaria oculi humani [in the liquor Morgagni and in the cataractous lens, Gescheidt, Nordmann]. The filaria in the blood [Klenke]; the anchylostoma duodenale [Dubini, in the duodenum]; the spiroptera hominis [Barnett, in the urine]; the dactylitis aculeatus [Curling, in the urine]. Finally the encysted nematoda.

Trichina spiralis, an incarcerated worm, which one might be tempted to class intermediately between the nematoda and the cystica, were it not extremely probable that it is only a strayed nematodon which, without coming to maturity, encysts itself, perishes, and cretifies within a second cyst thrown out from the textures.

The worm is enclosed within a double cyst, an external one, mostly lemon-shaped, and an inner, oval one; the space of the first, at its two ends, being filled up with very fine dark granules. Both consist of a homogeneous, faintly granular structure; the former being about one fiftieth of an inch long, and one ninety-fifth broad, the latter one seventy-seventh long. In the inner cyst, amidst a more or less granular, viscid, transparent fluid, lies the worm, perfectly free, and generally rolled up in two and a half spiral convolutions. When extended it is from one twenty-fifth to one thirtieth of an inch long, and about one six-hundredth broad, lumbricoid, thread-like at both extremities, although more pointed at the one than at the other. It possesses internally a winding canal, interpreted as intestine, and a granular organ, the designation of which, as an ovary, is without doubt erroneous.

Occasionally the cyst contains two, or even three, worms.

The Trichina spiralis inhabits the voluntary [striated] muscles, and always in vast multitudes, the muscles appearing to the naked eye studded with little white specks. The cysts always lie with their long diameter parallel to the course of the muscles. [Hilton, Owen, Blizzard, Henle, and others].