96 ANIMAL PARASITES. 



1. Bothriocephalus latus = Diboihrium latum. 

 PI. II, figs. 1, 2, 3, 4, 5. 



Caput oblongum, inerme, 2 bothriis-foveis marginalibus, formam 

 rimae aut fissuree {feute) adoptantibus ; collum subnullum ; articuli 

 numero circa 2000, maturi omninu latiores (ad 27 millim.), quam 

 longi, socialiter decedentes ; pori genitales in linea mediana siti, 

 masculus major et superior, ex quo penis Icevis et brevis prominet, 

 femineus minor, posterior inferiorque. Scolex quiescens ignotus ; 

 scolex activus cum strobila in hominis tubum intestinalem incohns, 

 longitudinem 7 — 8 ulnarum, secundum Dujardinum ad 20 

 " metres" (?) exhibet. 



Embryones 6 uncinulis (?) armati, in ovulis 0-028-32 mill, longis 

 et 0'002 mill, latis, ellipticis, fluvo-fuscis, operculo dehiscentibus in- 

 clusi. 



Synonyma. — Tenia a anneaux courts, ou a mammelons ombili- 

 caux ; T. large ; T. a epine ; T. lata, T. grisea, T. vulgaris, 

 T. membranacea, tenella, T. dent at a, T. humana inermis, T. de la 

 premiere espece (Plater and Andry). Halysis lata or membra- 

 nacea, the broad tape-worm, Nelaken, Lindworm, Baandworm, 

 Baendelorm, Brimike mask, the tape-worm, jointed worm ; Kosso ; 

 Luig ditg ; the short-jointed worm. 



It would be unnecessary and superfluous for the practical man 

 to clear up the confusion prevailing here. The names given are, 

 to a great extent, common, popular names for tape-worms in 

 general. A portion of the names referred to, however, applies 

 most remarkably to the hookless T. mediocanellata. Since the 

 time of Bremser, who first correctly determined this worm, it has 

 borne the name of Bothriocephalus latus ; but it is not advisable to 

 retain the names of Swiss tape-ivorm and broad tape-ivorm as 

 synonyms, as this nomenclature gives rise to a confusion of this 

 parasite with T. mediocanellata. 



The exact knowledge of this worm has scarcely been at all 

 advanced since Eschricht's classical work, for which reason we 

 have depended upon Eschricht, except in the consideration of 

 the scolex of the Bothriocephali and their prophylaxis. 



a. Mature state. 

 It is only this grade of development that occurs recognisably 



