352 DR. A. E, SHIPLEY ON [ Mar, 16, 
small, gradually enlarging in breadth as they descend till they 
reach about the middle of the body, where they are still narrow, 
linear-shaped, and about seven times broader than long. After 
this they begin to increase in length and diminish in breadth, 
becoming at first nearly square, and at last, near the extremity, 
nearly twice as long as broad. All the articulations are strongly 
striated across, and the upper and lower margins, where they 
join with each other, are considerably thickened. Length 
53 inches, greatest breadth 32 lines, breadth of lower extremity 
1 millimetre, of head 4 mm. 
‘‘ Hab. Intestines of the common Grouse, Lagopus scoticus, 
Brit. Mus.” 
The same worm has been more fully described, also under the 
name 7’. calva, by F. 8. Monticelli*. 
The genus Tenia has been comparatively lately broken up into 
a number of other genera, and one genus Davainea, named after 
the celebrated French helminthologist Davaine, has been estab- 
lished for those worms which have the rostellum and suckers armed 
with a multitude of characteristically shaped hooks or thorns. 
The genus was made in 1891 by R. Blanchard and A. Raiiliet, 
and it comprises a number of. species which, as a rule, live in the 
smail intestines of birds. 
Specimens of Davainea urogalli vary greatly in appearance and 
in size. On the whole, they have in life rather an untidy, dis- 
hevelled appearance, without clear-cut features ; some preserved 
specimens, however, had very definite outlines. Doubtless much 
depended on the preservative. 
Our longest specimens measured 35 cm. in length ; the greatest 
breadth was 4 mm. The preserved material evidently died in 
very varying states of contraction, and it is difficult to make 
general statements as to the relative proportions of different parts 
of the body. One specimen 35 em. in length we found in a bird 
of not more than three weeks old. It was shedding ripe pro- 
glottides. This worm had split and presented a forked tail, 
one limb of which, however, seemed to have dwindled and come 
to nothing. 
The head is very small. Baird gives its breadth as “1 mm.” 
I should put it at about the same, but here, as elsewhere, no two 
specimens are exactly alike. The proglottides which follow are 
extremely narrow from behind forward, but they very rapidly 
increase in breadth, so that 6 or 7 mm. from the head the breadth 
is 1 mm., and at about 12 to 15 mm. it is2mm. The greatest 
breadth is usually about 2°5 mm. to 3 mm., but in some specimens 
4 mm, are reached (Pl. LVII. fig. 2). The broadest portion is 
usually about the third quarter of the body from the head ; even 
here the segments still have but a very shallow antero-posterior 
diameter, about 0-6 mm. to 1 mm. Behind this region the 
segments narrow again. They become as long as they are broad, 
* Boll. Soc. Napoli, ser. I. v. 1891, p. 155. 
