518 



THE ANIMAL PARASITES OF MAN 



and a well-developed receptaculum seminis^ and of a vaginal sphincter. The 

 ovarian tube opens into the lateral wall of the uterus. Fourteen to eighteen 

 lateral branches issue from each side of the uterus but are not perpendicular 

 to the main trunk. The yellowish ova are of ovoid form. 



Tenia africana, v. Linstow, 1900. 



The German colonial possessions have given us the knowledge of a new 

 tenia, v. Linstow described a large tenia of man which Dr. Fiilleborn found 

 in a negro soldier at Lake Nyassa. The scolex is unprotected, and is smaller 

 than the following chain of segments. The proglottides, even the terminal 

 ones, which, besides the uterus filled with ova, contain no other sexual organs, 

 are broader than they are long. The uterus consists of a longitudinal trunk 

 extending in an antero-posterior direction with 15-24 transverse branches on 

 either side which radiate toward the center. The interior organization is 

 different from that of tenia saginata in all essen- 

 tial points. The suctorial discs are enclosed by 

 rounded projections from which rays extend to the 

 periphery. 



a 

 Fig. 43.- 



a-d, Segment chains of the tenia africana; e, scolex from the vertical plane; /, lumen 

 of a suctorial disc. (After v. Linstow.) 



The length of the three fragments of a tenia was 1,375 mm.; whereas the 

 segments of the tenia africana which are two mm. long show full maturity; 

 there is no trace of sexual organs in the segments of the tenia saginata which 

 are 3.16 mm. long and 5.84 mm. broad. The ova are ovoid, 0.043 mm long 

 and 0.034 mm. broad. 



Tenia asiatica, v. Linstow, 1901. 



von Linstow recently described a tenia of man which was found by Anger 

 in Aschabad. The specimen is 298 mm. long; the segments are broader than 

 they are long and their chain is narrow. The foremost proglottides have a 

 breadth of only Q.lfi mm. with a length that cannot be estimated. Later they 

 mcrease m breadth from 0.67-1.78, and in length gradually to 0.99 mm The 

 posterior border of the segments slightly overlaps the beginning of the follow- 

 ing one. Seven hundred and fifty proglottides were present; the scolex was 

 absent. The formation of the uterus, as well as that of the other sexual 

 organs, suggests that this variety belongs to the tenia madagascariensis. 



