246 



THE ANIMAL PARASITES OF MAN 



consumers after having been rendered innocuous by cooking, or by pickling for 

 twenty-one days in 25 per cent, salt brine, or hanging for twenty-one days in 

 suitable refrigerators ; oxen in which only one cysticercus is found are 

 allowed free commerce, and those strongly infected (i.e., containing more 

 than ten living cysticerci) may only be used for industrial purposes. 



The cysticercus of the ox has hitherto been found in man on 

 very rare occasions. Arndt (Zeitschr. f. Psych., xxiv.) mentions a 

 case in the brain, Heller in the eye, and Nabiers and Dubreith 

 also in the brain. (Journ. mcd. Bordeaux, 1889-90, p. 209) ; but 

 the diagnoses are not quite certain, as absence of hooks also 

 occasionally occurs in Cysticercus celluloses. 



Tcznia saginata is the most frequent tapeworm of man (with 

 the exception of Dibothriocephalus latus in a few districts), and the 

 parasite is widely distributed over the surface of the globe ; it has 

 been known in the east for ages ; according to accounts received, 

 it is frequent in Africa, America and Europe. Its frequency has 

 perceptibly increased during the last few years, but a decrease 

 should soon take place in consequence of the extent and improve- 

 ment of the official inspection of meat. 



The following table shows the relative frequency of the ces- 

 todes of man : 



6. Tcenia africana, v. Lstw., 1900. 



This worm measures over 1-3 m. in length. The segments 

 are all broader than they are long. The- scolex is unarmed and 

 is provided with an apical sucker (0*16 mm.). The parasite measures 

 1-38 mm. in breadth, 1-03 mm. in width ; the suckers measure 

 0*63 mm. in diameter. The neck is verv short and somewhat 



