840 DR. F. E. BBDDARD ON A 



Ijima is regarded by him — and, as I think, rightly — as a young 

 Bothriocephalid whose larval stages ai-e also known from similar 

 positions in other mammals than man. These larvse have no 

 bladder, and thus the fact that in the Plerocercoid, as in my 

 worm, the buds are produced from the general body surface loses 

 its principal significance. It is, I think, more important to note 

 that the worm from Fiber zibethicus differs from Gysticercus 

 longicoUis, in that the budding is not upon the bladder end of the 

 worm. It is remarkable, however, that both in my worm and in 

 the Plerocercoid there is no recognisable scolex ; but at the same 

 time there is in the supposed young Bothriocephalid no proper 

 segmentation of the body as yet visible. It is thus particularly 

 remarkable that my species is very fully segmented throughout. 

 I think, therefore, that the case of budding which I bring forward 

 in the present paper may be regarded as in some respects a new 

 form of asexual reproduction which is partly paralleled in a few 

 other forms of Tapeworms. 



Inasmuch as the propagation of this worm is different in detail 

 from anything that is known, and as the worm itself does not 

 entirely conform with any known species or genus, it is desirable, 

 as I think, for mere convenience sake to give it a name and to 

 define as far as may be the characters of the Oestode. Had the 

 worm proved definitely a Tetracotylean*, I should have con- 

 tented myself with referring it temporarily to the genus " Tcenia," 

 a name which is generally given to forms whose generic afiinities 

 are uncertain. As, however, this cannot be done with any 

 certainty, I venture to give a new generic name which is non- 

 committal as to its position in the series, and I term it 

 accordingly 



Urocystidium gemmiparum, gen. et sp. n. 



Incomjiletely mature ivorm toith small bladder and very numerous 

 proglottids. Scolex feebly developed and loithout hooks. Tiobes of 

 water vascular systeon lateral to each other, the dorsal loith thick 

 'muscular coat and inside of ventral, the ventrals connected by a trans- 

 verse vessel which forks and surrounds dorsal vessel ; a net-work present 

 in cortex as well as in medidlary region. Longitudinal muscle- 

 layer in cortex of at least two roius of bundles with numerous fibres 

 in each. Buds formed at hinder end of body on botli sidles, thus 

 form,ing two rows, of which the bladders are attached to the parent 

 stock ; the scolex is not inverted, is loithout hooks, and rudimentary. 



Hob. Musquash. {Fiber zibethicus), in liver-duct. 



(2) The Sexual Form. 



As has been already mentioned, the hepatic duct contained 

 besides the " cysticercoid " just described a sexual worm which I 



* 1 think it necessary to maintain an attitude of reserve with respect to the 

 identity' of the asexual and sexual forms. 



