A NEW SPECIES OF CESTODE PARASITE (T^NIA BALANI- 

 CEPS) OF THE DOG AND OF THE LYNX, WITH A NOTE 

 ON PROTEOCEPHALUS PUNICUS. 



By Maurice C. Hall, 



Junior Zoologist, Bureau of Animal Industry. 



The tapeworms of the dog have received considerable attention 

 from scientists, and the great amount of work on the commoner forms 

 led at an early date to a number of valuable discoveries which have 

 given these forms permanent scientific importance. From an eco- 

 nomic standpoint the tapeworms of the dog are likewise of great 

 importance, as several species have an intermediate stage which 

 develops in man and the domestic animals, often with serious or fatal 

 consequences. 



The tapeworm described in this paper was first found in a dog 

 which had been fed larval Multiceps serialis in Fallon, Nevada, in the 

 spring of 1908 and shipped to this laboratory. Apparently the dog 

 received an overdose of Multiceps — it had been fed six clusters — and 

 the infection with the strobilate Multiceps serialis did not develop. 

 When the dog arrived in Washington, thirteen days after being fed 

 the first four clusters of Multiceps, the feces already showed numerous 

 cestode eggs. These could hardly be attributed to strobilate forms 

 resulting from the ingestion of the Multiceps larva, as the brief 

 period of thirteen days would be too short a time for the adult worm 

 to have developed, judging from the experiments of Baillet (1863) 

 and from the time required for the development of other dog tape- 

 worms of nearly the same size. In subsequent investigations on the 

 life history of the parasite, the larval form failed to develop on feed- 

 ing the eggs to the rabbit, a point which also indicates that the tape- 

 worms present did not include M. serialis. 



Two weeks after the dog's arrival a proglottid was found in the 

 feces. A little more than a month later a chain of thirty-six 

 attached proglottids was found in the feces and an examination of 

 these showed that the tapeworm belonged to an undescribed species. 

 For over six months proglottids, either singly or in chains, were 

 collected from time to time from the feces. One specimen having a 



Proceedings U. S. National Museum, Vol. 39— No. 1780. 



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