VOL. XXXVI.] PHILOSOPHICAL TRANSACTIONS. 3gi 



windings, stretches away straight towards the anus, into which it is inserted in 

 the shape of a pretty stiff' vessel ; but the other, at the side of the wrinkled 

 canal, being pressed, collected, and equally inflected, almost through its whole 

 extent, by the transversal fibres, ends in the opposite side, hy an extremity 

 pendulous in the belly, not far from the anus. 



The inner coat of the skin, just as in the females, is all covered with small 

 whitish bladders, turgid with lymph, but less, in proportion to the less bulk 

 of the worm. 



Under the wrinkled canal was found a certain whitish duct, marked with the 

 letters bbb, fig. 8, firmly connected to the aforesaid intestine by its finest part; 

 but whose outlet or origin, the tenderness of the intestine, and fineness of the 

 duct, hindered us from tracing with exactness. 



The fo/loivhig Figures represent the Worms, drawn according to their natural 

 Size. — Fig. 3 represents a female worm: a, the worm's mouth; b, the anus; 

 c, the vulva; d, the chestnut-coloured lines, running along its length. 



Fig. 4; a, the worm's mouth; b, the alimentary canal, which is white, 

 carnous, &c.; c, the alimentary canal, which is brown and flatted, and whose 

 extremity is in tlieanus; d, the place where the canals join; eee, the trans- 

 versal fibres; f, the anus. 



Fig. 5 and 6; a, the worm's mouth; bb, the first alimentary canal; cc, the 

 latter alimentary canal; d, the place where these two canals cohere; eee, the 

 transversal fibres; fff, the white vesicles turgid with lymph, with which all the 

 inner skin is thick beset; g, the anus; h, the vagina; s, the oviduct; i, the 

 outlet of the vagina, or the vulva; kk, the ovary filled with innumerable eggs; 

 11, the vasa prasparantia. 



Fig. 7; the eggs viewed through a microscope; a, through the microscope, 

 N° 3 ; b, through the microscope, N° 1. 



Fig. 8; a male worm; a, the mouth; bb, the whitish alimentary canal; cc, 

 the wrinkled canal of the aliments; d, the vermicular process of the spermatic 

 vessels; ee, a branch of the spermatic vessels along the side of the intestine, 

 compressed by the transversal fibres, and inflected through its whole extent in 

 a uniform manner; fff, the windings and turnings of the spermatic vessels; 

 gg, the transversal fibres; h, the cartilaginous membrane surrounding the 

 anus; i, the small slit in its middle; k, the very fine capillary process; mm, 

 the small bladders covering the skin. 



Fig. Q; a male worm inverted, and dissected about the anus, in order to see 

 with ease the duct lying under the alimentary canal; a, the wrinkled alimentary 

 canal; b, the whitish duct under the wrinkled ciuial; c, the spermatic vessels. 



Fig. 10; a, the vermicular process of the spermatic vessels; bb, the branches 



