From the dale jiivcii it is iillfilv iiniiossible to dv 

 •iiuiiu* Ihcsc woiiiis, ami it appears useless to allemp 



Genus BOTHRIOTAENIA nallllct, 1S92. 



Diagnosis: Twu suckers piesviu: yenit:il poixs liUi^ral (mar- 

 ginal). Type species Bothriotaonia longicoliis (Molin, IS'iS) 

 Railliet, 1S92. 



JL BOTHRIOTAENIA LONGICOLL.IS (Molln. 185S) Rnlllet. 1892. 

 (1S5S, J>ili(illiriiuu lonsicoUe Molin; 1S7S, Bothrioceplialus longi- 

 coliis (Molin, 1S5S) von Linstow). 



Diagnosis: IS""" to 27""" long by 4""" wide. Head small, 

 claviform, thick, with 2 marginal oblong suckers, and a small 

 central depression on the summit. Neck long and very thin. 

 Rody taenioid, flat, with 3 longitudinal grooves. Anterior seg- 

 luenis very short; the following segments almost square, ovei- 

 lapi'ing; posterior segments transverso-elliplic, thick with 

 lounded borders. Gravid segments show a mosaic structure of 

 dark, angular spots due to egg sacs. Genital pores unilateral, 

 about in the middle of the margin. 



Development: Unknown. 



Host; Chickens (Gallus domesticus), by Molin. 



Disl;ribution: Pavia, Italy (by Molin and Polonio). 



Moliu seems to be the only audior who has made 

 •Any ofigiual obsei'vatioiis on this worm, ami these are 

 not extended enough to give us any clear idea of the 

 I)arasite in tjuestioii. The egg sacs, unilateral pores, 

 and the central depression on the summit of the head 

 recall i>avaiuea (vide p. (513), with the tiuer.v whether 

 Afolin was really not in error in describing two snck 

 ers instead of four. fSuch an error would be an ex- 

 tremelj' easy one to fall into, as the suckers of avian 

 cestodes are frequently indistinct or lost. 



At all events, Molin's original specimens should be 

 reexamined, as nearly forty years have now passed 

 since the worm was lirst found: it has iid b-^en col 

 lec'od in recent years, although the chiek<'ii has fie 

 (luently been examined for ta]Hnvorms. 



