ASCARIS LUMBRICOIDES. 411 



77iuscu!oso, 6 — 8 mill, longo, filiformi, triquetro, venlriculo clava- 

 formi (07 mill, lato, 2 — 3 mill. Ion go) parvulo, intestino simplici 

 valvulis aut villis tt epithelio polyedrico sparsim instructo. 



Mas ■■ 150 ad 170 ?nill.= k ad 6"' long., 3-2 mill, lat., cauda 

 aliquid depressa, conica, inflexa et curvata, spictdis 2 planis, sub- 

 ensiformibus, fore reclis, 1*8 mill, ad 2*12 mill, longis, - 18 ad 

 23 mill, latis. Organo spermatico simplici, 1200 mill, longo, 

 testiculo caco perparvo, retortiformi, funiculo spermatico albo-intu- 

 mido, ductu ejaculatorio angustiore ad ani latus sese aperienli. Sper- 

 matozoidia globuliformia, granulosa, in femina vagina maturescentia. 



Femina : 200 ad 275 mill, et supra longa = S ad 18''; media in 

 parte 4 ad 5*5 mill, lata ; caudd conica obtusd ; aut aliquid ante 

 caadce apicem sito (1 mill, circiter) ; vagina simplici ante corporis 

 dimidium sitd, ex magnitudine feminarum variabili {ex. c. 85 mill, 

 pone caput in femina 245 mill, et 103 mill, in femina 214 mill, 

 longa) ; utero ab initio simplici, bipartita aut biloculari. Ovaria 

 jiUformia, sensim attenuata, retrorsum usque ad anum, et an- 

 trorsum supra vaginam aliquantulum pergeutia. Totalis utriusque 

 ovarii longitude ad 44/' Lips. 



Ovula immatura subfriquetra, numero 4 ad 8 conglomerata, 

 matura isolata, rotunda, ad - 087 mill, lata, cum testa tenui, Icevi ; 

 in natura libera sensim embryones evolventia. 



As regards the bead of this worm, we find it to be distinctly 

 composed of three papillae which can undoubtedly be spread out 

 upon the intestine, in a broad, circular, sucker-like surface in 

 the sucking-act of the worm. Their moveability is shown not 

 only by the lighter notches at their base, which indicate that 

 the papillae or lips move as it were in a sort of hinge, but also 

 by the cock's-comb-like structures in their interior which are no- 

 thing but muscular fibres, connected by means of a thin stra- 

 tum running through the hinge just described, with the general 

 muscular system of the body. Bremser has seen the 

 opening and closing of these papilhe, and described the me- 

 chanism. He even reports that at the moment of opening, he 

 saw a little tube protrude from the centre, which is the true oral 

 orifice. Wedl thinks this the cleft proboscis, which is everted 

 from the oral aperture for the reception of nourishment. I can- 

 not give the name of oral aperture to this everted cylinder; the 

 true oral aperture is formed by the opened lips or papilhe ; the 

 small tubule in the centre represents the Introitus faucium. Its 

 pt-otrusion is perhaps as much an active one by its own 



