91 



studied without reg'ard to ''loco," which, if a disease at all, belongs to 

 yearlings and older sheep. 



Experiments were undertaken with a view of infecting lambs with the 

 parasites, while the lambs were kept from other possible sources of in- 

 fection ; but these were fruitless. Other experiments were entered upon 

 with a view of removing these parasites by medicinal remedies. None 

 of these were eflective in removing the parasites from the gall-ducts, 

 and were abandoned until more could be learned of the life history of 

 the parasite, when they could again be taken up with perhaps a better 

 l)rospect of success. 



• The total results regarding this twnia, so far obtained, are as follows, 

 viz: 



The parasite persists in an adult stage in the older sheep throughout 

 the year. 



The smallest forms appear in lambs soon after the second month of 

 their age, and may be found in sheep of any age throughout the year, 

 excepting, possibl}^ the winter months. 



It requires at least six months, possibly ten, to attain an adult size. 



Tbeovaor embryos are continually passed from the sheep to the ground 

 throughout the year. The life of the embryo from the time it leaves 

 one sheep until it is fonnd in another is yet undiscovered. 



When present in considerable numbers in sheep it determines a dis- 

 ease which is not only detrimental to the value of the animal, but at 

 times causes the death of large Tiumbers. 



No medicinal remedies can be recommended which will assuredly re- 

 move the parasite from the host. 



Many measures may be taken which may prove to be effective in two 

 ways, first, in preventing sheep from becoming infected ; second, in 

 enabling the sheep to better withstaiul the ravages of the parasite, and 

 thus carry it over the critical stage of its existeiuic. 



The lambs and yearlings are the greatest sufferers, and it is to these 

 that the most attention must be paid. 



TvENiA FiMBRtATA, Diesing. 



Synonymy. — Thysanosoma acUnioides, Dicsin<f, 1834. Meil. Jalirl). il. oesterr. Staat. 



Neiie Folge, VII, 105-111. Taf. Ill (Fig. inverse delin.), Ej. Syst. Helm. I, 



.^>01 in nota. 

 Ta'nin fimbriata, Diesing. Syafc. Helm. I, 501. 

 Twnia fimbriata, Diesing, 1856. Zwanzig Arten v. Coplialocothyleen, p. 11, 1856. 



Wien. 

 Tcenia fimbriata, Rept. Dopt. Agric., 4tli and 5th Annual Repts. of Bureau Animal 



Industry, 1887, 1888, p. 1(57, Pis. I and II. 



Tfcnia fimbriata, Diesing, was first discovered by Natterer, in Brazil, 

 in 1824, and published by Dr. K. M. Diesing in 1834, as a new genus, 

 Thysanosoma acUnioides. Later, in 185G,.Dr. Diesing republished this 

 parasite as Twnia fimbriata. (See Plate XIII.) 



