VO i.) Cenurus of the Hare. 267 
vesicle, are about two lines in length and one in breadth at the 
_ widest part, which contains the head turned inward like the partly 
inverted finger of a glove. The body displays a number of trans- 
verse lines, indications of the future joints of the worm. 
If one of these papillz be carefully detached and placed under a 
microscope, moderate pressure upon the covering-glass will cause 
the enclosed head to protrude and bring to view its four sucking 
disks and double crown of pointed hooks, 14 or 15 in each row. 
The hooks of the inner row are double the size of the outer; but 
being attached half their length nearer the center, the points of all 
fall in the same circle. Just beneath the dermis are seen an immense 
number of round or oval bodies of a concentric structure, which 
effervesce strongly on the addition of sulphuric acid. These are 
the so-called calcareous corpuscles, and are supposed to act as a 
kind of external skeleton. 
The head and neck of this ceenurus are much asic in propor- 
tion to the body than are those of the czenurus of the sheep, as it is 
shown in the drawings to which I have had access. 
The natural hosts of the cenurus of the hare are probably she 
dog and the wolf. Our wild dog, the coyote, will serve to illustrate 
the journey of its life. A hare badly infested with czenurus, be- 
comes swollen and deformed, and as the loins and thighs are at- 
tacked by preference, his powers of locomotion are seriously im- 
paired. In this condition he falls an easy prey to his hereditary 
foe. : 
The coyote swallows not only the hare, but its 10,000 contained 
larvee, a circumstance which would undoubtedly give his victim a 
feeling of malicious joy, if he were in a condition to know anything 
at all about it. The larve are set free in the stomach of the coyote 
by the digestion of the vesicle, and a certain proportion succeed in 
attaching themselves, by their hooks and suckers, to the walls of 
the small intestine, fortunately only a very small proportion, for _ 
their way is beset with dangers, and their extraordinary fecundity 
is calculated in proportion to their chances of safety. 
The tape-worm is a colony of hermaphrodites, each joint of which 
is a sexually complete animal, male and female containing thousands 
of eggs. It reaches maturity in about six weeks, after which period _ 
the lower joints, and numerous free eggs are discharged at each 
evacuation, and Cob packets Sate the sipaneera weeds or ie 
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