268 



ENTOZOA. 



whilst the observer is invariably struck with the appearances 

 presented by the highly refracting calcareous corpuscles, which 

 more particularly abound at the parietes and inferior part of the 

 scolex. On these bodies I need scarcely dwell, as I have already de- ~ 

 scribed their essential features when commenting on the structure of 

 the Gysticercus tenuicollis. Their size varies, and in Huxley's hydatid, 

 from the zebra, they presented an average of the ^ko' only. Huxley 

 even goes so far as to express his belief " that in the young and 



h'lG. 60. — Portion of a daughter vesicle, or secondary cyst, sliowiug " tlio relation of the endocyst 

 to the laminated ectocyst" and the so-called Echinococci contained in a brood-capsule (X about 

 80 diam.) From a zebra. — Huxley. 



normal adult state, these pecuhar corpuscles are never calcareous, 

 but are composed of an albuminous substance." This notion, as 

 to their earthy character being the results of a degenerative 

 process, cannot, as I have said before, be maintained ; notwithstand- 

 ing, it is quite true that all the cestode larv^ exhibit a tendency to 

 calcify, after they have passed the natural limit of their vitahty. 



