338 



ENTOZOA. 



I may remark, also, that the presence of these organized cap- 

 sules is by no means so essential as some have supposed, if, indeed, 

 they be at all requisite. As Leuckart has shown, they are rather 

 to be regarded as abnormal formations ; for, in many cases where 



Pig. 72. — Highly magnified reprcBentation of Trichina, spirally coiled within its cyst. — Bristowe 



and Bainey. 



hundreds of Trichinae co-exist in the muscles, these cysts may be 

 altogether wanting. The larval Trichinae themselves measure the 

 ^" in length, with a transversal diameter of about ^" (^" by 7^" ac- 



