194 ENTOZOA. 



specimens were discovered by Mr. Busk in the duodenum of a Lascar. 

 From a careful examination of three examples, severally presented 

 by the discoverer to the Museum of the Eoyal College of Surgeons, 

 the 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 genera 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 fi?om 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. 



6. DiSTOMA HETEEOPHYES. 



D. heterophyes, Von Siebold and Bilharz ; Kuchenmeister. 

 Fasciola heterophyes, Moquin-Tandon. 

 Dicrocoelium heterophyes, Weinland. 



General and Specific Characters. — A minute trematode helmmth, measuring only 

 three-fourths of a line iu length, and one-fourth 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 margius ; reproductive orifices inconspicuous but evidently placed below and 

 a httle 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 viteUigene 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 contractile vesicle, 

 the latter opening externally by a central /oj-amera caudale. 



* This specimen is figured in Leuckart's recent work. Erst. Bd., s. 686. 



