ECHINOCOCCUS SCOLICIPARIENS. 193 



composita, parvulas rjemmas (brood -capsules) stylosas gignens, in 

 quibus scolices singuli proliferantur, magnitudinem 30 mill, et ultra 

 exhibens. Scolices societies gemmis diruptio libere in vesicam 

 emissi, parvuli, capile Teenies modo dicta. Metamorphosis in 

 Tceniam post 7 — 8 hebdomades per acta. 



Habitat : Interdum in homine, plerumque in aliis animalibus 

 plerumque domesticis ex or dine Ruminantium et Herbivoracium. 1 



Tcenia matura. — This Tcenia lias not hitherto been found in 

 the human subject, but it was known to Rudolphi, and was 

 found by him accidentally in the intestine of a pug-dog (a breed 

 which is now extinct according to Vogt). Rudolphi regarded 

 them as heads of Tcenia cateniformis {cucumerind) produced by 

 spontaneous generation. (See ' Entoz. hist, nat./ i, p. 411.) Roll 

 afterwards found it in Vienna in two dogs; and Von Siebold and 

 I, without knowing anything of each other, simultaneously 

 ascertained that Roll's Tcenia was not T. serrata juvenilis, but a 

 peculiar species of Tcenia, derived from Echinoc. veterinorum. 

 Haubner and I also found this Tcenia in great quantities in dis- 

 secting a sheep-dog in Kleinbautzen, and I found it myself pgain 

 in a butcher's do°\ As far as I am aware, no one has vet bred 

 this Tcenia by the intentional administration of its Echinococci, 

 except Von Siebold in 1852, and myself shortly afterwards, as 

 my plates sent to the Academy of Sciences in Paris will pi'ove. 

 Since that period I could obtain no Echinococci for administration, 

 until, at the end of the month of December, 1854-, I obtained 

 two vesicles, which were given by me to two dogs, and one by 

 Haubner, in Dresden, to a third. Since then I have frequently 

 given them. This Tcenia always occurs in society, prefers taking 

 up its position in the upper parts of the small intestine, is 

 hardly 3 — 4'" in length, and becomes mature even in the third 

 segment ; it requires for its perfect development a period of 

 about eight or nine weeks, according to Von Siebold only seven ; 



1 Many who are not exactly acquainted with the subject may be puzzled because in 

 the figures of this and the following species different parts of one and the same worm 

 occur in one figure very unequally magnified. I must admit that I did not know how to 

 do otherwise without adding to the number of the plates, which are in themselves very 

 expensive. I shall be thankful for any hint in connection with this, and beg those who 

 may only become acquainted with the subject from this book, to bear in mind that for 

 the purpose of diagrammatic representation an error in regard to proportional size has, 

 perhaps, been made. 



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