ago PHILOSOPHICAL TRANSACTIONS. [aNNO IJSO. 



contorted and implicated in many and various windings and curves, widens and 

 straightens here and there, till at length becoming more and more capacious, 

 it forms a little bag, for which a whitish, fine, smooth canal, about an inch 

 long, covered with pretty thick, coats, piercing through the skin li inch from 

 the mouth, prepares an outlet, marked under the belly with a caruncle, as in 

 fig. 3, and h fig. 5, 6. This little canal may, not improperly, be called the 

 oviduct or vagina. 



The colour of these parts is not every where the same; for of whitish at the 

 beginning, in the progress it insensibly becomes darker: and at length, where 

 the vessel acquires a greater volume, and especially where it stretches forth into 

 the bag, it is of a chestnut colour. And as far as this chestnut colour continues, 

 the vessel is thick stuffed with myriads of eggs, and therefore is to be called 

 the ovary. 



The eggs, whose number is certainly incredible, seen with the naked eye, 

 resemble a magma of a brown colour; but viewed through those microscopes, 

 which in the English apparatus bear the second and third number, they are of 

 the figure marked a and b in fig. /• 



The surface of the inner skin, which inclosed the abdominal contents, was 

 all beset with small whitish bladders, of different figures and sizes, pouring out 

 a lymph when torn. These were in the females. 



Though the integument of the male be marked with annular fibres, and as 

 many chestnut-coloured lines, as that of the female, throughout its whole length, 

 yet his external shape differs from that of the female: 1st. Because he is much 

 less, 2dly, Because, the third hole, viz. that under the belly, is wanting in 

 the male. 3dly, Because the anus of the male is surrounded with a thick car- 

 tilaginous membrane, of nearly an orbicular figure, about a line broad, externally 

 convex, internally concave; on the middle of which appears a tubercle, divided 

 by a fine slit, which lets out the excrements, and a very small capillary process, 

 k, fig. 8. The cavity of the belly contained a limpid humour, the transversal 

 fibres, the alimentary canals, and the spermatic vessels. The alimentary pas- 

 sages had the same situation and structure as in the female; the anterior canal 

 was of a whitish colour, the posterior, or wrinkled one, of a pale brown. 



The spermatic vessels were very white and slender, yielding, when wounded, 

 a milky humour. They are divided into two small branches, hanging out of 

 a vermicular process, scarcely an inch long, which lies in the belly, in that 

 place where the alimentary canals are joined together, and leans on the side of 

 the wrinkled canal, by the help of the transversal fibres. These branches, in 

 their progress hence, creeping above and below the canal of the aliments, 

 are very often reflected, intorted and folded; one at length freed from its 



