186 Lewis and McConnell — On a New Parasite affecting Man. [AuGTJSr, 



below. As indicated in the figm-e (i), the two canals thus formed termi- 

 nate csecally about opposite the middle-half of the caudal sucker. 



Closely attached to the canal on either side, and easiest seen when the 

 dissection is conducted from the dorsal surface of the AmpJiistoma, are the 

 main branches of the water-vascular system (Jc), with which numerous fine 

 Ganaliculce may, in suitable specimens, be seen connected along the entire 

 course of the main trunks. 



The Genital pore (e), as before stated, is situated about ^2" below 

 the oral sucker. The orifice is surrounded by muscular fibres arranged in 

 a circular and radiating direction. Into it open the two channels of the 

 sexual apparatus of this hermaphrodite entozoon. The vagina (f) is, in mature 

 specimens, filled with ova, and it measures near its exit-termination about 

 jij" transversely. The convolution of the vagina and uterus occupy a great 

 portion of the interior of the worm, to such an extent indeed is this the case 

 that it is difiicult to prick the skin of the dorsal sui-face without witnessing 

 the escape of ova by the rupture of some of the uterine convolutions. In 

 front of these convolutions, as seen from the ventral aspect, is the ovarian 

 portion of the reproductive apparatus (J) and closely adjoining are the 

 lobulated testes (J) from which the vas deferens with its continuation the 

 ductus ejaculatorius (g) may be traced. A double twist may generally be 

 perceived to have formed along the course of this duct ; its width be- 

 tween this spot and the genital pore is about -^jo" or about half that of the 

 vagina at the same part. 



The ava Fig. 3, Plate III, have firm capsules, and are provided with 

 the operculum common to the ova of flukes. The average measurements 

 proved to be tto" in length by -g^-^" in diameter. 



The ramifications of the vitellogene ducts with the glandules may 

 be perceived through the cutaneous covering of the parasite, presenting 

 a dendriform arrangement (ji), especially distinct all over the surface of 

 the lursa ; and their nxain ducts (on^ may be seen in some specimens 

 directed towards the ovarian body. In addition to these glands the 

 cutaneous envelope of the entire entozoon is seen to be plentifully supplied 

 with glandulse, of varying size, but averaging about ^^~' ; interspersed 

 amongst which are numerous minute cells averaging •o^o'o" ^^ "soVo" ^^ 

 diameter, generally of hyaline ajopearance and not unlike the calcareous 

 particles common to entozoa. They withstand the action of dilute hydro- 

 chloric acid. 



With these remarks we conclude our description of the leading fea- 

 tures in the anatomy of this new parasite and we trust it is sufficiently 

 explicit to enable fviture observers to experience but little difficulty in 

 identifying it. 



