5S2 



I'^nuii Ihc (laic j^iveu il is utlcilv impossible to dc- 

 1 ermine these woims, ami it appears useless to attemi»t 

 it. 



Genus BOTHRIOTAENIA Railllot, 1892. 

 Diag-nosis: Two suckers present; genital pures lateral (mar- 

 ginal). Type species Bothriotaenia longicollis (Molin, 1858) 

 Railliet, 1892. 



2. BOTHRIOTAENIA LONGICOLLIS (Molin, 1858) Raillet, 1892. 



(IS.Ji;;, Diliulhrium luugicolle Mulin; 1878, liuthriucephalus longi- 

 collis (Molin, 1858) von Linstow). 



Diagnosis: IS'"'" to 27in'ii long by imm wide. Head small, 

 claviform, thick, with 2 nrarginal oblong suckers, and a snrali 

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

 Body taenioid, flat, with 2 longitudinal grooves. Anterior seg- 

 ments very short; the following segments almost square, over- 

 lapping; posterior segments transverso-ellipiic, thick with 

 rounded 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. 



Distribution: Pavia, Italy (by Molin and Polonio). 



Molin seems to be the only auUior who has made 

 any original observations on this worm, and these are 

 not extended enough to give us any clear idea of the 

 parasite in question. The egg sacs, unilateral pores, 

 and the central depression on the summit of the head 

 I'ecall J>a^aiuea (vide p. 613), with the query whether 

 Molin was really not in error in describing two suck- 

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

 tremely easy one to fall into, as the suckers of avian 

 cestodes are frequently indistinct or lost. 



At all events, Molin's original specimens sho\ild be 

 re-examined, as nearly forty years have now ])nssed 

 since the worm was first found; it has not b'^en col- 

 lec^od in recent years, although tlu^ chicken has fre- 

 • piently been examined for tapcAvoims. 



