194 ENTOZOA. 



specimens were discovered by Mr. Busk in tlie duodennm of a Lascar. 

 From a careful examination of three examples, severally presented 

 by tlie discoverer to tlie Museum of the Royal College of Surgeons, 

 tlie Museum of the Middlesex Hospital Medical College, and 

 to my private collection,* I am satisfied that it is generically dis- 

 tinct from the above ; but it is unnecessary to insist further on 

 this distinction, as I have already, in this work, exposed the fallacy 

 of combining- the srenera Fasciola and Distoma. In two of the 

 specimens which Mr. Busk injected with mercury, the injection 

 has passed from the digestive into the aquiferous system, which 

 latter, in its arrangements, does not differ materially from that of 

 Fasciola hepatica. The original account in Dr. Budd's work on 

 diseases of the liver speaks of a "branched uterine tube." This 

 description, however, is manifestly erroneous, and probably refers 

 to the division of the narrow end of the ovarian tube, where it is 

 joined by the two main ducts which come from the yelk-forming 

 glands on either side of the body. 



5. Distoma heteeophyes. 



D. heterophyes, Yon Siebold and Bilharz ; Kuchenmeister. 

 Fasciola heterophyes, Moquin-Tandon. 

 JDicrocoelium heterophyes, Weinland. 



General and Specific Characters. — A rainute trematode lielmintli, measuring only 

 tliree-fourths of a line in length, and one-fourtli of a line in breadth ; having an oblong 

 pyriform outline, attenuated in front, and obtusely rounded behind ; body compressed 

 throughout, the surface being armed with numerous minute spines, which are particu- 

 larly conspicuous (under the microscope) towards the head ; oral and ventral suckers 

 largely developed, the latter being near the centre of the body, and about twice as 

 large as the former ; pharyngeal bulb distinct and separate from the oral sucker, and 

 continued into a long oesophagus, which divides immediately above the ventral aceta- 

 bulum ; intestinal tubes simple, gradually widening below and terminating near the 

 posterior margins ; reproductive orifices inconspicuous but evidently placed below and 

 a little to the right of the ventral sucker, at which point they are surrounded by a 

 special accessory organ, resembling a supernumerary sucker ; uterine folds numerous 

 and central, communicating with small but conspicuously developed vitelligene glands ; 

 testes spherical and placed on the same level in the lower part of the body ; ovary 

 distinct ; aquiferous system terminating inferiorly in a large oval conti-actile vesicle, 

 the latter opening externally by a central ./brflmen caudule. 



* This specimen is figured in Lenckart's recent work. Erst. Bd., s. 586. 



