176 DE. T. S. COBBOIiD ON CESTOIB ENTOZOA. 



there were found in tliis " Lurclier " several examples of the large 

 Tcenia marginata, six or eight specimens of Tcenia serrata, and a few 

 examples also of T. cucumerina. There were likewise some half- 

 dozen nematodes {Strongyli). In addition to all these, however, 

 there were a multitude of small tapeworms (of the species T. 

 coenurus), the longest of which did not exceed one inch and a half 

 in length, sexually immature, and manifestly corresponding with 

 the numerous scoleces artificially introduced. Again, therefore, 

 despite the inconveniences always liable to attend administrations 

 of this kind on old dogs, we had abundant proof of the success of 

 our experiment. 



Exp. 4. On the 25th of April, 1865, another of the two re- 

 maining T. ccenuri just mentioned was given by Mr. Simonds to a 

 smaller dog. This hydatid was also well furnished with cephalic 

 processes (or larval tapeworm-heads). In this case the experi- 

 mental animal was not killed until more than two mouths had 

 elapsed from the time of the worm-administration. On the 29th of 

 the following June we made the necessary examination. Again 

 we were successful. The intestinal canal contained large numbers 

 of the Tcenia coenurus, there bqing no other kinds of entozoa pre- 

 sent. The experiment was therefore even more satisfactory than 

 the previous one. The largest specimens measured about 18 

 inches in length ; but when I examined their proglottides, the 

 contained eggs were still not quite perfectly develoj)ed. The 

 primitive yelk-sacs and superfluous granular yelk masses were 

 very conspicuous, but the true chorioual envelope was only in tlie 

 act of forming. The swallowing of the ova in this imperfect 

 stage would lead to no result. Probably another week or ten 

 days would have sufficed to render all these Tcenice sexually 

 mature. 



Exp. 5. On the 8th of July, 1865, a large T. coenurus was given 

 to a terrier, which was also subsequently fed with trichinous flesh. 

 This animal died on the 2nd of August of the present year, but 

 unfortunately neither Mr. Simonds nor myself had any oppor- 

 tunity of examining the contents of its viscera. A portion of its 

 muscle-flesh was sent to me for microscopic examination, and this 

 I found to contain encysted Tricliince. 



Tcenia ecJiinococcus. — On the 23rd of June, 1865, I sent several 

 fresh echinococcus-hy daiids to the College, which were on the 

 same day administered to a dog by Professor Simonds. By an 

 oversight this animal was not destroyed until the 18th of August, 

 1S66, when, as regards the T<enia ecJiinococcus, we obtained only a 



