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REPORT ON ZOOLOGY, MDCCCXLIV.

of the heart. With respect to the latter situation, hehas met with only two instances. In one of which, aservant girl twenty-three years old who died suddenly,there was seated in the “ septum ventriculorum” a fibro-serous, delicate-walled cyst, larger than a hen’s egg,which had burst, and whose equally large Acephalocyst hadbeen forced into the conus arterialis and pulmonary artery.The liver also had been the seat of Acephalocysts, one asbig as a child’s head, and two smaller ones. In the secondcase, which was that of a soldier, thirty-five years of age,who died suddenly, a rounded cyst, of the size of a duck’segg, was seated in the most posterior and superior part ofthe septum ventriculorum, which inclosed, besides a pul-taceous, brownish fluid mixed with broken down, flocculent,fibrinous coagula, the remains of Acephalocysts reduced to agelatinous consistence. Alessandrini also (Isis, 1843, p.628) found, in the walls of the right ventricle of an Ox, anEchinococcus veterinorum with young animals. Two casesof hydatids of the liver and cavity of the pelvis, which werecertainly nothing else than Echinococcus hominis, have beendescribed by Nicolai. (Medizinische Zeitung, Herausg. v. d.Verein f. Heilk. in Preussen, 1843, p. 107.) Another caseof hydatid formations in the lungs, communicated by Bou-vier (Bulletin de l’Academie Royale de Medecine, 1843,t. viii, p. 1244), must also he here referred to. In the caserelated by Dickson (Schmidt’s Jahrbiicher, Bd. 39, 1843,p. 294), in which a semi-cartilaginous sac filled with amelicerous substance, in the liver of a man, twenty-five yearsold, contained hydatids from the size of a pin’s head tothat of an egg, and several others of the pill-box kind, acolony of Echinococcus hominis cannot be mistaken. Eras­ mus Wilson (Dublin Medical Press, No. 399, Dec. 1844,p. 361), having observed a case of Echinocccus hominis inthe liver, in which it is extremely probable that the pediclesat the posterior extremity of the body of the young Echi-nococci, by which they are connected with Echinococcus-capsules, struck his notice, proposes to name these animals