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Show 848 MR. GULLIVER ON THE ANATOMY [Dec. 6, saw that those females which were distended with eggs had a similar genital papilla, only shorter and with a wider canal than in the male. Through this vulva the eggs, each about a fortieth of an inch in diameter, readily escaped in single file. The intimate structure of the organ is the same, and the tube a genito-urinal outlet, in both sexes. From the above descriptions, it appears that during the spawning-season, the peritoneum of the Lamprey is not in either sex a shut sac, for it opens outward by the tubular canal, through and along the centre of the genital papillse of the male and female-and that in each sex the genital outlet is single, with its external opening independent of and separate from the so-called cloaca. Spermatic Filaments, fig. 6.-These were extremely abundant. Their mean length is ~0 and their thickness 30 1 000 of an inch. Though but little acted on by acetic acid, they do not preserve their shape well in drying. Indeed the effect of this acid seems to indicate different chemical characters of the spermatozoa of different animals. While it has no effect on those filaments of most mammalia, it dissolves or destroys very quickly the spiral spermatozoa of birds; and yet the club-shaped spermatozoa of this class resist its action like those of mammalia, as more particularly noticed in the ' Proceedings' of this Society, July 26, 1842. In the above woodcut, figs. 4 and 5 show the genital papillse of the natural size-fig. 4 of the male, and fig. 5 of the female ; in each |