DISTOMA LANCEOLATUM. 273 



2. Distoma lanceolatum (Mehlis). 

 PI. V, figs. 11, 12. 



Corpus laevi, lanceolatum, pldnum aliquid pellucidum, aut ovulis 

 flavofuscum, 4*5 12 millim. seu 2 6 /x/ longum, 2 ad 2'2 millim. 

 aut 1 2'" latum in anteriore parte tenuius, acetabulo finitum, 

 in posterior -e aliquid obtusum. Collum continuum, conicum, planum, 

 longius, quam in D. hepatico. Os fere terminate, globosum, 0'48 

 mill, latum, acetabulum orbicular e, 0*48 mill, latum, 1*1 mill, pone 

 os situm, ore majus. (Esophagus 0'48 mill, longus, bulbus oeso- 

 phagi (HO mill, latus ; intestinum bifurcatum, rectum, simplex, 

 non amplius ramificatum, 0*04 mill, latum. 



Genitalia inter os et acetabulum ventrale sese aperientia, inter in- 

 testini bifurcationem sita, 



Vesica seminalis exterior = cirrhus claviformis ; funiculus sper- 

 maticus flexuosus ; penis longus, cylindricus, plerumque rectus ; 

 testiculi 2 majores et tertius minor vesicam seminalem inter nam 

 exhibens ; unus pone alterum et pone acetabulum ventrale siti, vix 

 lobati. Organa vitellina multo minor a, quam in D. hepatico, 

 albida, lateralia, ramificata, 1 1^ mill, longa, in ovarium et uterum 

 intrantia, longiora quam in Dist. hepatico et tenuiora, sed colore 

 obscuriore prtedita, multifarie voluta. Ovulo multo minora, quam 

 in Dist. hepatico, 0-041 mill. = 0'018'" Par. = 0-0185'" Vienna 

 longa et 0*0246 mill. = Q'OIQ&" Par. = 0'QlI'" Vienna lata, sed in 

 statu maturo multo obscuriora quam in D. hepatico et nigro-rubra. 



Systema excretorium : Vasa lateralia, ad collum usque promi- 

 nentia, ibique recurrentia et intumescentid minore, ad animalis 

 apicem sit a, finita. 



This parasite was seen in the human subject by Bucholz (vide 

 supra], and apparently by Chabert and Mehlis (vide supra, under 

 D. hepaticum), unless, as already remarked, Mehlis's case was a 

 mystification of the surgeon. 



After the above we have but little of a general nature to add. 

 The animals are narrow and elongated, and are particularly dis- 

 tinguished by the long neck, by the want of any spiuous coat, 

 and by the female sexual organs especially occupying the abdo- 

 men, and the testicles the anterior part of the body. This last 

 circumstance alone should have been sufficient to separate 

 this species from D. hepaticum, and to prevent their being 



