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foge AVIAN ENTOZOA—LINTON. | Be 
Tenia compressa sp. nov. 
(Pl. vin, Figs. 83-92. ) 
A large lot of Teniz from Fuligula vallisneria consists of a variety 
of forms which, however, upon examination do not afford differences 
that can be regarded safely as specific. I have therefore referred 
them to a single species. 
This species resembles 7. sinuosain the number, size, and shape of 
the hooks, but differs from it in the absence of the globular spinose 
sack near the genital orifice, described and figured by Dujardin and 
others. 
Tenia compressa, as represented by the individuals in this let, may 
be briefly characterized thus: Head variable, usually broader than 
long, often pyramidal, compressed laterally, bothria prominent; pro- 
boscis ob-conical with a simple crown of rather straight hocks, ten in 
number and usually about 0.055 millimeter in length; reproductive 
apertures along one margin, cirrus 0.008 to 0.01 millimeter in diameter, 
spinose with a smooth conical tip; neck short; first segments usually 
crowded, much broader than long; median segments in longer stro- 
biles also crowded, very short, ripe segments funnel-form with salient 
posterior margins. 
The specimens in this lot varied from 5 to 27 millimeters in length. 
In the preliminary examination of these specimens they were separ- 
ated into three groups. 
The first group contained small club-shaped strobiles from 5 to 10 
millimeters in length. 
The second group contained longer specimens, 20 to 30 millimeters in 
length. 
The third group was much like the second, but with thicker and 
broader strobiles. 
Two or three fragments were found that appeared to belong to a dif- 
ferent species. In them the segments were exceedingly short and 
crowded and the breadth was about 2 millimeters, considerably greater 
than that of any of the complete strobiles. 
In the first group the neck, i. e., unjointed part of the body, is short, 
the segments soon become distinet, at first sometimes funnel-form, 
then rauch crowded together, becoming funnel-form again towards 
the posterior end. The segments increase in breadth to near the pos- 
terior end, so that the whole strobile becomes somewhat club-shaped. 
The reproductive apertures are all on one margin of the strobile, each 
a little in front of the middle of itssegment. The elongated bulb of the 
cirrus (Figs. 89, 91) lies on an elliptical body, which is yellowish and 
opaque. The bulb is at first nearly transverse to the longitudinal axis, 
becoming inclined posteriorly at the marginal end in the posterior seg- 
ments. The cirrus is about 0.01 millimeter in diameter, thickly beset — 
