1909.) TAPE-WOBRMS OF THE RED GROUSE. 357 
“ As the inquiry into the cause of poultry diseases becomes 
more general it is probable that this affection will be occasion- 
ally encountered, and unless its nature is recognized it may in 
some instances, like the sheep disease, lead to an unwarranted 
destruction of property. 
“ Tn addition to its importance in differentiating tuberculosis 
it is in itself a malady worthy of careful attention. The fact that 
- it has already appeared in two flocks in the Distriet of Columbia, 
and also in the States of North Carolina and Virginia, shows 
that the infesting cestode is quite widely distribute] in this 
eountry. It is highly probable that the total loss it occasions, 
both from deaths and from the shrinkage of poultry products, 
due to the chronic course of the disease it produces, is very 
large.” 
(ii.) DAVAINEA CEesTICILLUS (Molin), 1858. 
Synonym: Tenia cesticillus (Molin). 
This is a small species; the majority of our specimens measured 
between 5°5 and 9 mm. in length. Few were longer, though many 
were shorter. They were all young immature specimens. The 
broadest at their broadest part, usually about the level of the last 
proglottis but two or three, measured 1 mm. across. They tapered 
to the last proglottis, which averaged about 0°5 mm. in diameter, 
and still more do they taper towards the head, where the narrow 
neck is but 0°2 mm. The head itself is 0°3 to 0°5 mm. across and 
perhaps two-thirds of this in length. 
The hooks in the rostellum were numerous, I should judge a 
few hundred, but I could not, on account of their minute size, 
count accurately: they measured about 7 p in length. 
The head when the rostellum is withdrawn is somewhat cup- 
shaped and the four suckers are on the edge of the cup, opening 
at the edge and slightly inwards. There is practically no “ neck,” 
just a constriction between the head and the first proglottis. 
Behind the head the proglottides increase markedly in size, and 
the third proglottis in most specimens is already as broad as the 
head. They are deeply imbricated and the overlapping edge is 
full and rounded. At the level of the anterior end of each pro- 
glottis is a constriction which slightly separates off the overlapping 
lobe from the preceding proglottis, to which it, of course, belongs. 
This gives a somewhat ear-like outline to the side of each seg- 
ment. The constriction first appeags in about the tenth proglottis, 
and the characteristic outline is lost in the last, where the over- 
lapping edges curve in asif to guard the excretory opening. The 
total number of the proglottides varies a little with the variable 
length, but differences in length depended far more on the state of 
contraction of the body than on the number of segments. 
Roughly speaking, the numbers varied from about eighteen to 
about twenty-eight proglottides. 
