22 ON PARASITES. 



worm, and take up the requisite migration to the wished for tissue or 

 locality. These remarks apply to the cystic form of resting scolex. 

 The other two forms probably pass through the stage of resting into 

 active scolex in the intestines of the same animal. 



The perfect tape worms found in the alimentary canal of man are 

 the Taenia solium (passim) Taenia mediocanullata, in various parts of 

 Europe ; a variety found at Cape of G-ood Hope, which possibly may 

 be identical with the Taenia mediocanullata and the Taenia nance. 

 This latter is probably the mature animal from the Echinoccus 

 hominis. 



The Cysticercus cellulosae found so abundantly in the pig, sheep and 

 rabbit, and also in man, is the cystic worm corresponding to the 

 Taenia solium. The scolex of Taenia mediocanullata is unknown to 

 Kuchenmeister. 



The Cysticercus termicellis is occasionally found in the abdominal 

 cavity of man, more frequently in the sheep, ox, hog, ape, goat. 

 The tape worm or taenia ex cysticercus termicelle is the taenia margin- 

 alis of Batsch, found in the intestine of the dog and wolf. 



The T^kia Solium 



is misnamed, as undoubted examples are known of several indivi- 

 duals growing simultaneously in the same intestine. 



The head varies in size, but is never seen larger than a millet seed. 

 When magnified it is square shaped. The hooks are arranged in two 

 rows and are 24-28 in number. They are planted in little sacs whose 

 depth corresponds with the stem of the hooks in length. 



The points of all the hooks fall in the same circle. The most 

 characteristic mark of this species, says Kuchenmeister, is the 

 lunate notch in the stems of the hooks, on their posterior surface. 



The length of the first series of hooks varies from 0,175 — 215 mil. 

 Of the second series from 0,117 — 126 mil. 



The sucking discs, four in number, are nearly circular. From each 

 of the discs a canal descends, which all unite with the two longitudinal 

 ones. The neck is quite short and smooth. Behind the neck is the 

 body or strobila, which consists of joints which are larger and more 

 strongly marked as they approach maturity. From about the 280th 

 segment the genital apparatus begins to appear. These organs will 

 be described with the embryology. The individual joints present at 

 their anterior extremity a transverse canal connecting the longitudinal 



