PARASITES OF THE ALIMENTARY TRACT ot 
The cystic form is Cenurus cerebralis, which develops 
under the dura mater of the sheep’s brain, and occa- 
sionally of cattle, and in rare instances that of the horse, 
producing the so-called sturdy, or gid. 
The Cenurus cerebralis sometimes attains a com- 
paratively large size : cysts of the volume of a hen’s egg 
are not uncommonly met with. The contents are 
limpid and colourless. The surface shows scattered 
clusters of dense white spots, representing invaginated 
scolices. 
The ova or terminal segments of Tenia cenurus are 
ingested by a lamb, and the outer coverings become 
dissolved in the stomach. The embryos are set free, 
and bore into a small vessel, whence they are carried to 
various organs of the body. Those which reach the 
brain gradually develop into Ccenurus cysts. 
They have also been described as occurring in other 
organs and tissues. 
Tenia Krabbei—Not found in this country. Seg- 
ments wider than long. Genital pore occupies the whole 
of the lateral edge of each segment. 
The cystic form is a Cysticercus, and has been seen in 
the muscular tissues of reindeer. 
Tenia Cucumerina, or Dipylidium Caninum.—This 
worm, as its less common name indicates, is a Dipylidium, 
having its genital pores situated on each side of each 
segment. It is about 16 inches in length, and is a very 
common inhabitant of the dog’s intestine. The head is 
larger than the neck, rounder in shape, and bears a 
protractile rostellum, armed with several rows of hooks. 
The segments are elliptical in shape, and resemble 
cucumber-seeds joined end to end. The cystic stage is 
passed in one of the external parasites of the dog, such 
as the flea or louse. 
Bothriocephalus Latus is unarmed, having no hooks. 
The genital pores are central in each segment. 
