56 



their length is 0*063 mil., and the length of the foot 

 only 0-030 mil. 



" The calcareous corpuscles in the skin of the 

 worm (PI. III. fig. 6, A) measure 0-003 to 0-009 mil. 

 The length of the whole Cysticercus is about 10 

 mil., without the bladder, which latter is of about 

 the same size as in the C. cellulosae. The suckers 

 of the head are visible to the naked eye. The neck is 

 irregularly scalloped close to the head. At a distance 

 of 5 mil. from the head, the worm grows suddenly 

 broader; and there are distinct folds running trans- 

 versely over the worm, dividing this into distinct 

 joints. To this broader part is attached the bladder, 

 by a narrow bridge. The cysts, which contain Cysti- 

 cerci, have exactly the same appearance as those of 

 C. cellulosae ; looking somewhat like white beans, 

 they lie along the fibres in the muscles, splitting them 

 in such a manner as to make a gap before and be- 

 hind the cyst, which is filled with yellow fat." 



Thus far, I have given the list of the Taeniae and 

 Cysticerci now known to inhabit the human body. 

 Those in the list left for me to speak of are the 

 Echinococci and Acephalocysts. 



Of the former group, there are two kinds, the 

 Echinococcus hominis (E. altricipariens of Kiichen- 

 meister), and the Echinococcus veterinorum (E. scolici 

 pariens of Kiichenmeister). Of these two, the latter 

 is the only one of which the mature form is found, 

 viz., the Tsenia Echinococcus (Von Siebold) ; that of 

 the former (according to Kiichenmeister) being un- 

 known. As the Taenia is an inhabitant of the intes- 



