DESCRIPTION OF T^NIA ACANTHOTRIAS. 561 



other parts of the brain. The intensity and exact nature of the 

 symptoms vary of course enormously. We must not for a moment 

 forget that we have not yet anything like sufficient data to determine 

 with any certainty the connection between anatomical and patho- 

 logical conditions in this matter. Still less can we understand the 

 physiology of such a connection. Since without further evidence, such 

 as the presence of bladder-worms in the skin or the eye, it is difficult 

 to be sure of their presence in the brain at all, it must be even more 

 difficult to determine the position and distribution of these worms. 



As in so many other matters, we must look to the future, in 

 expectation of a deeper insight into the anatomical and physiological 

 facts of the case. 



Taenia acanthotrias, Weinland. 



Weinland, "An essay on the tape- worms of man," p. 64 : Cambridge, U.S.A., 1858. 

 ,, Med. Correspondenzbl. d. Wurtemb. drztlichen Vereins, No. 31, 1859. 

 ,, " Beschreibung zweier neuer Tanioiden des Menschen," Nova Acta Acad. 

 Cces. Leop.-CaroL, Bd. xxviii., Taf. i.-iii 



Only the bladder-worm of this Cestode is as yet known. It is very 

 like Cysticercus celluloses, and lives like it in the muscles and brain of 

 man. It is distinguished ~by the structure of the hook apparatus, which 

 is composed of a triple circle of from fourteen to twenty-six somewhat 

 slender hooks. 



The first observer, Jeffries Wyman, found it in a Virginian woman, 

 who was infested with Trichina, and who died of consumption. He 

 regarded it as Cysticercus celluloses, as did Weinland also, until he 

 discovered the remarkable structure of the hook-apparatus. 



The reports made by Weinland on this interesting parasite I am 

 able to confirm, after examination of the only specimen which has 

 been seen in Europe, which was most liberally lent me by the owner, 

 my friend Weinland. I may also add that the head of this, as of 

 the ordinary bladder-worm from the muscles, is rolled up in the 

 receptacle like a snail, and has its apex impregnated with black 

 pigment granules. 



The total number of hooks in the specimen I investigated was 

 forty-eight, while Weinland reports the number as forty-two. All 

 three forms of hooks are present in equal number, and the smallest 

 thus occur between every hook of the first row and the adjacent hook 

 of the second row on one side. In spite of the different sizes of the 

 hooks, their points all fall very much on the same line, which is due 

 of course to their being inserted at different levels on the rostellum. 

 The diameter of the latter and of each sucker is about 0'35 mm. The 



2 N 



