184) Lewis and MeConnell — On a New Parasite affecting Man. [Atjgust, 



The lithograpli (Plate III) which accomjjanies this preparation gives a 

 very correct representation o£ the csecum with portion of the adjacent ileum, 

 from the above case. It has been drawn to the exact size of the specimen as it 

 now exists in the Medical College Museum. Several of the parasites have 

 also been delineated. The majority were f oimd free, i. e. detached from 

 the surface of the bowel, but others are seen to be still slightly adherent 

 or entangled in the folds of the mucous membrane. The sohtary glands 

 are seen to be throughout prominent and hypertrophied, a condition which 

 although very common in cholera, aj)pears in this instance to have existed 

 (and still persists) in a very remarkable degree, — probably on account of 

 the great follicular irritation which these parasites by their presence, are 

 likely to have excited. 



Jumphistoma Jiominis, sp. nov. 



The parasite belongs to the Trematode or Fluke order of Helminths and 

 to the genus AmpTiistoina. We have endeavoured to refer it to one or 

 other of the tolerably numerous species belonging to this genus but have 

 not been able to find that it belongs to any hitherto described species, so 

 have decided on naming it Amphistoma hominis. 



The sjDCcimens in our possession vary slightly in size, possibly owing to 

 to the different mode of preservation — those which were obtained from the 

 Assamese having first been treated with chloride of zinc and subsequently 

 preserved in glycerine, whereas the other samples appear to have been pre- 

 served in spirit throughout. Those of the former kind are of a grayish 

 dark colour owing, as already stated, to the action of the zmc solution, whereas 

 those of the latter are of a grayish yellow tint. Their greatest length 

 varies frona the -|^ to -| of an inch (5 to 8 millimeters) and the greatest 

 width, across the caudal sucker, from \" to -g-" (3 to 4 millimeters). Its 

 form is somewhat difiicult to describe : Fig. 2 a in the Plate represents a 

 ventral view of it ; fig. 2 6a dorsal, and figs, c and d lateral and semidorsal 

 views — all sketched double their natural size. It may be roughly divided 

 into an anterior and a posterior half, the length of the former being about 

 half the transverse measurement of the latter. At the anterior extremity 

 (slightly on its ventral aspect) the oral sucker is readily detected, and 

 about y*2- of an inch below this sucker is the genital pore. The posterior 

 half of the AmpMstovia is composed of a somewhat flattened, circular 

 bursa, within which is placed the caudal sucker proper. The biorsa may 

 be observed in different states of contraction in different specimens ; when 

 flattened out, (as in figs, a and h, Fig. 2, Plate III) it measures about ^ 

 of an inch transversely. In some specimens this pouch is seen to have 

 become folded laterally, leaving merely a slit in the long direction of the 

 parasite and almost hiding the sucker itself from view. 



The Caudal sucker is a fii*m cup-shaped organ composed of circular and 



