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TiENIA MARGINATA AND CYSTICERCUS TEXUICOLLIS. 



latinrj. The last proglottides have the form and size of those in the 

 smaller human tape-worms, having a breadth of 4 to 5 vim., and a 

 length of 9 to 11mm. They contain a uterus, which is characterised partly 

 ly the shortness of the median stem, and partly by the small number (at 

 most eight) of lateral branches, which have, however, strong and wide- 

 spread ramifications above and below. The embryonic shells are round 

 (0-036 mm.), thick, and covered by a distinct layer of rods, as in T. 

 solium. 



The worm thus shortly described was first made known to us 

 by Ktichenmeister's breeding experiments. He termed it Tcenia e 

 Cysticerco tenuicolli ; after which I showed that it was identical with 



Fig. 304. — Hooks ot Tainia marginata. ( x 280.) 



the T. marginata described by Batsch from the wolf. This Krabbe 

 and Kiichenmeister confirmed. The related bladder-worm (Cysticercus 

 tenuicollis) lives sometimes alone, sometimes in groups in the omentum, 

 and more rarely in the liver and other viscera, especially of ruminants 

 and swine. ^ It has an oval form, and an ap- 

 preciable, sometimes considerable, size. In the 

 larger specimens the anterior end of the bladder 

 is drawn out into a long, slender, neck-like pro- 

 cess, which bears the parenchymatous worm-body, 

 and encloses it in a sheath, when both are re- 

 tracted within the bladder. Then it forms a more 

 Fig. z<)h.--CyAcerms qj. ^ggg \qt^o ribbon, hanmns into the cavity of the 



tenuuolhs, after Bremser .,., oo -i 



(half size). bladder, m which it sometimes floats freely, or is 



at certain points connected with the wall. 



Since the Cysticercus tenuicollis is not a rarity in animals used as 



food (also in deer and roes), and sometimes grows to the size of a 



child's head,=* we may readily suppose that it has been known for 



1 Africa is also a home ot the Cysticercus tenuicollis, as I have proved by the examina- 

 tion of a Cysticercus from Potamochcerus penicillatus, for which I am indebted to Dr. 

 Spencer Cobbold of Loudon. 



" Kiichenmeister even credits the bladder-worm with a length " of five feet," " Para- 

 siten," second edition, p. 138. 



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