210 ANIMAL PARASITES. 



cyst, but converge with their free ends towards the centre of the 

 cavity of the small vesicle. (See PI. Ill, fig. 18.) In very 

 large daughter-vesicles individual scolices also swim about 

 freely. 



4. The individual scolices produced or nursed by the mother-, 

 daughter-, or granddaughter-vesicles, are in general more slender 

 than those of the preceding species ; they have the head, with 

 its double circlet of hooks, more frequently protruded during life, 

 at least within the larger daughter-vesicles, exhibit distinctly 

 marked sucking-discs, and bear a much greater number (46 — 52 

 — 54) of hooks, which, on the Avhole, appear much more slender 

 than in the preceding species. From this we see that Livois' 

 statements regarding the number of hooks, &c, are perfectly 

 correct. 



5. The dwelling-place of this species is by no means limited, 

 indeed we may say that there is scarcely a part of the body in 

 which it may not be found ; thus it occurs in the liver, the 

 lungs, the kidneys, the sheath of the testicles, the spleen, the 

 ovaries, the breasts, the throat, in the subcutaneous cellular 

 tissue, in the bones, &c. 



6. With the augmentation of the secondary and tertiary cysts 

 in the mother-cyst, the latter, and with it the swelling increases 

 in size ; the more rapidly this takes place, the more does 

 the swelling increase, which facilitates the recognition of the 

 disorder and its natural cure, inasmuch as the mother-cyst is 

 burst in this way, and in most cases probably becomes destroyed. 

 We must not, however, always depend upon this last issue, for 

 the burst colony appears to heal again in a remarkable manner, 

 and then to be in a condition to recommence its production of 

 fresh daughter-vesicles. At least the remarkable case of a 

 patient observed by J littler and myself is in favour of this last 

 opinion. In this case, daughter- and granddaughter-vesicles 

 passed off through the urinary passages for a twelvemonth, but 

 after a very strong evacuation they at last ceased. After this 

 had lasted a year, the patient again suddenly observed an abun- 

 dant passage of daughter- and granddaughter-vesicles in the latter 

 part of January in this year. It is certainly possible that a 

 second colony may have existed close to the first, and that this 

 was now full-grown and burst, but we may still adopt the supposi- 

 tion of a healing of the first colony. 



7. In general the prognosis of this disorder appears to me to 



