TMNIASIS , 197 



the Multiceps serialis and its intermediate hosts are some 

 of the rodents and warren rabbits. This taenia develops 

 more rapidly than the others requiring but a few weeks. 



(/) Echinococciis granulosus (Tcenia echinococcus) . — This 

 species is distinguished from all others by its size. It is only 

 4 to 5 mm. long, and composed of 3 to 4 segments, the last 

 of which contains the mature ova. The head is armed with 

 a double row of 28 to 50 hooks. Eggs ovoid, 34 by 25 

 microns. The cyst form is the Echinococcus granulosus 

 (E. polymorphus) and is found in most of the organs of the 

 herbivora and even man, but is more common in the liver 

 and lungs of ruminants and pigs. It requires one month to 

 fully develop. This cyst is polycephalic and polysomatic. 



Taeniae in the Intestine of the Cat.— Three species of 

 taeniae have been found in the cat. 



(a) Tcenia tceniceforrnis {Tcenia crassicollis) . — This is the 

 most common taenia found in the cat. It attains a length 

 of 15 to 50 cm. and in appearance is similar to those found 

 in the dog. The head is armed with a double crown of 26 

 to 52 hooks and is about as wide as the neck. The posterior 

 segments are 8 to 10 mm. long and 5 to 6 mm. wide. Ova are 

 globular and 31 to 37 mm. in diameter. This taenia is repre- 

 sented in the vesicular or bladder form by the Cysticercus 

 fasciolaris which inhabits the liver of rats, mice and other 

 rodents. This cysticercus, which is always coiled up in a 

 cyst it has itself produced, is elongated in form, the body 

 composed of segments, and from 3 to 20 cm. long, while the 

 vesicle is ovoid and frequently no larger than a pea. 



(b) Tcenia elliptica and (c) Tcenia pseudo-elliptica have 

 been described as a variety of the Dipylidium caninum of 

 dogs; they are unimportant. 



(d) The Bothriocephalus felis has also been mentioned. 

 Little is known about it and no disturbance in the cat has 

 been ascribed to its presence. 



Taeniae in the Intestine of Rabbits.— Cestodes are rare in 

 these animals and all belong to one species, the Cittotsenia 

 denticulata (Moniezia denticulata) . These may attain the 

 length of 8 cm., head small and supplied with suckers. Seg- 

 ments 1 cm. broad and not so long. Two genital pores are 



