T^NIA SAGINATA 



339 



The length of the entire tapeworm averages 4 to 8 to 10 m. and 

 more, even up to 36 m. According to Berenger-Feraud it attains 

 a length of 74 m. (?) The head is cubical in shape, 1*5 to 2 mm. 

 in diameter ; the suckers are hemispherical (0*8 mm.) and are 

 frequently pigmented ; there is a sucker-like organ in place of the 

 rostellum, and this also is frequently pigmented. The neck is 

 moderately long and about half the breadth of the head ; the 

 proglottids, the number of which averages more than 1,000, 

 gradually increase in size ; the mature detached segments are shaped 

 exactly like pumpkin-seeds, and are about 16 to 20 mm. in length 

 and 4 to 7 mm. in breadth. The genital pores alternate irregularly 

 and are situated somewhat behind the middle of the lateral margin. 



There are twenty to thirty-five 

 lateral branches at each side of the 

 median trunk of the uterus, and 

 these again ramify. The eggs are 

 more or less globular, the egg- 

 shell frequently remains intact and 

 carries one or two filaments ; the 



FlG. 241. Mature 

 segment of Jcenia 

 saginata, G., with 

 distended uterus. 



2/1. 



FIG. 242. Ce- 

 phalic end of Tania 

 saginata in the con- 

 tracted condition. 

 8/1. 



20 



19 



FIG. 243. Tcenia saginata. 19, egg with 

 external shell. 20, without (embryophore), 

 (After Leuckart.) 



embryonal shell (embryophore) is thick, radially striated, is transparent 

 and oval ; it is 30 //, to 40 //, in length, and 20 //, to 30 p in breadth. 

 Several segments simultaneously are usually passed spontaneously 

 with defaecation. 



Malformations are not uncommon, and resemble those of Tcenia solium ; 

 a triangular form has been termed T. capensis by Kiichenmeister, and T. lopho- 

 soma by Cobbold, names that naturally possess as little value as does the term 

 T. fenestratatov fenestrated specimens. Moreover, T. solium, var. abietina, Weinld., 

 1858, which was evacuated by an Indian, was probably a T. saginata with somewhat 

 close uterine branches. It is regarded by Stiles and Goldberger as a doubtful sub- 

 species. 



T. saginata in its adult condition lives exclusively in the intestinal 



