840 1)1!. I'. I'. lU'.DDAltl) DN A 



Ijima is rogaitlod by liiiu — and, as I think, rii^htly — as a young 

 Botlirioccjihalid whoso hvrval stages are also known from siniilnr 

 positions in other manunals than man. These larvie have no 

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

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

 its principal siguiiicance. It is, J think, more important to note 

 that the worm from Fiber ::ibethici(s diti'ers from (^j/siiccn'iis 

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

 worm. It is remarkable, however, that both in my worm au<l in 

 the Plerocei'coid there is no recognisable scolex ; but at the same 

 time there is in the supposeil young- Hothriocephalid no jn-oper 

 segmentation of the body as yet visible. Jt is thus paiticularly 

 remarkable that my species is very fully segmented throughout. 

 I think, therefore, that the wise of budding which 1 bring forward 

 in the present paper may be i-egarded as in some i-espects 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 diiVerent 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 1 think, for mere convenience sake to give it a. name and to 

 define as far as may be the charactei's of the Oestode. Had the 

 worm proved deiinitely a, Tetracotylean*, 1 should have con- 

 tented myself with referring it temporarily to the genus ":7'<r/(/rt," 

 a. name which is generally given to forms whose generic affinities 

 are uncertain. As, however, this o^annot be (lone with any 

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

 committal as to its pi^sition in the series, and 1 term it 

 accordingly 



Ui'ocystidium gemmipanim, gen. et sp. n. 



/nvoDiphtch/ malitrt iforDi iritJi s))iall hhnhd'r ami vcri/ UKuicrotts 

 p roc/lot tiih. iScolex feebli/ derdopal (Xnd icitJumt hookn. Tubes of 

 tvater vasc^idar si/steDi lateral to mch other, the dorsal with thick 

 omisctdar coat and inside of ventral, the vcntrals connected bif a trans- 

 verse vessel which forks and surroiinds dorsal vessel ; a netirorkjiresent 

 in cortex as well as in medullar t/ region. Zonxiitiidinal viascle- 

 layer in cortex of at lea'St two o'ows of bundles with numerous Jibres 

 in each. Buds formed at hinder end of body on both sides, thus 

 forniini/ two rows, of which the bladder.'t are attached to the parent 

 stock ; the scolex is not inverted, is u'ithoutJiooks,and rudiinentar)/, 



JIab. IMusquash {Fiber .^ibeihicus), in liver-duct. 



(2) The Sexual Form. 



As has been already mentioned, the hejiatic tluct contained 

 besides the " cysticercoid " just described a sexual worm which 1 



* 1 think it nocossiiry to inuiutiun an attitude of reserve with respect to the 

 identity of the asexual and sexual forms. 



