DISTOMA LANCEOLATUM. 273 



2. Distoma lanceolatum (Melilis). 

 PI. V, figs. 11, 12. 



Corpus Icevi, lanceolatum, planum aliquid pellucidum, aut ovulis 

 flavofuscum, 4-5 — 12 millim. seu 2 — 6"' longum, 2 ad 2*2 millim. 

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

 in posteriore aliquid obtusum. Collum continuum, conicum, planum, 

 longius, quam in D. hepatico. Os fere terminate, globosum, 048 

 mill, latum, acetabulum orbicular e, 048 mill, latum, 1*1 mill, pone 

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

 phagi 040 mill, latus ; intesiinum bifurcatum, rectum, simplex, 

 non amplius ramificatum, 004 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 internum 

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

 lobati. Organa vitellina multo minora, quam in D. hepatico, 

 albida, lateralia, ramificata, 1 — U mill, longa, in ovarium et uterum 

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

 obscuriore pr&dita, midtifarie voluta. Ovulo multo minora, quam 

 in Dist. hepatico, 0-04i mill. = 0-018'" Par. = 0-01 85"' Vienna 

 longa et 0-0246 mill. - 00108'" Par. = 0011'" 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 Melilis (vide supra, under 

 D. hepaticuni), 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 spinous 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. hepaticuni, and to prevent their being 



