ASCARIS LUMBRICOIDES. 411 



musculoso, 6 8 mill, longo, filiformi, triquetro, ventriculo clava- 

 formi (0'7 mill, lato, 2 3 mill, longo") parvulo, intestino simplici 

 valvulis aut villis et epithdio polyedrico sparsim instructo. 



Mas : 150 ad 170 mill.= L ad 6"' long., 3'2 mill, lat., cauda 

 aliquid depressa, conica, infleoca ct curvata, spiculis 2 planis, sub- 

 ensiformibus, fere rectis, 1'8 mill, ad 2-12 mill, longis, 0-18 ad 

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

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

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

 matozoidiaglobuliformia,granulosa, infemince vagina maturescentia. 



Femina : 200 ad 275 mill, et supra longa = 8 ad 18"; media in 

 parie 4 ad 5'5 mill, lata ; caudd conica obtusd ; aut aliquid ante 

 caudce 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 

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

 trorsum supra vaginam aliquantulum pergentia. Totalis utriusque 

 ovarii longitudo ad 44" Lips. 



Ovula immatura subtriquetra, numero 4 ad 8 conglomerata, 

 matura isolata, rotunda, ad 0'087 mill, lata, cum testa tenui, laevi ; 

 in natura libera sensim embryones evolventia. 



As regards the head 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 papillae, 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 papillae ; the 

 small tubule in the centre represents the Introitus faucium. Its 

 protrusion is perhaps as much an active one by its own 



