102 AVIAN ENTOZOA—LINTON. 
Tenia sp. Fragments not certainly identified. 
(Pl. vi, Figs. 54-58.) 
Several fragments of Tenia from Larus sp. and Colymbus sp., collected 
at Guaymas, Mexico, by Mr. P. L. Jouy, February, 1891, have been re- 
ferred to me for examination by the U. 8S. National Museum. 
The fragments are without scolices, which makes the matter of iden- 
tification uncertain. 
I append, however, the following descriptive notes on these frag- 
ments. 
I. Fragments of Tenia from Colymbus sp., Museum No. 4930 collect- 
or’s No. 972 (Figs. 54, 55). 
Mr. Jouy’s notes on this lot are: “972. Parasitic worms from intes- 
tines of Colymbus sp. ¢ juv. The throat and stomach of this bird were 
empty and'these specimens, apparently of a tapeworm, were found in 
the lower intestine.” 
The fragments appear to belong to the same strobile; the longest 
measures 115 millimeters, and the next longest 65 millimeters. The 
ageregate length of the fragments f& about 200 millimeters. The largest 
proglottides are about 2 millimeters broad and 1 millimeter in length. 
The youngest segments are 0.75 millimeter in length, 1.2 millimeters 
in breadth, and 0.7 millimeter in thickness. Color of the alcoholie¢ 
specimens, pinkish yellow, or faint rose. The segments are rounded on 
their anterior corners, posterior corners blunt and slightly projecting. 
Reproductive apertures all on one margin about the middle of the seg- 
ments. Cirri, not seen projecting, but appear to have rather large 
diameter. Sometimes one margin of a segment projects about its mid- 
dle point. This projection is on the margin opposite the one bearing 
the genital form. 
The ripe segments contained ova which were inclosed in an outer 
pellneid envelope measuring from 0.09 to 0.12 millimeter in diameter, 
and containing an embryo 0.06 to 0.07 millimeter in diameter, the spines 
of which were about 0.02 millimeter in length. 
These fragments very probably belong to the species 7. capitellata 
Rudolphi or to an undescribed closely related species. 
II. Fragments of Tenia from Larus sp. Museum No, 4931. Collee- 
tor’s No. 973 (Fig. 56). 
Upon these Mr. Jouy makes the following note: ‘973. Parasitic 
worms from intestines of black-backed gull, Larus sp. There are ap- 
parently two kinds of worms from this specimen, but they are all taken 
from the intestines, the throat and stomach of the bird being clean and 
empty.” 
The longest fragment measures 155 millimeters inlength. The other 
fragments are 80, 30, and 18 millimeters, respectively. The 80 and 30- 
millimeter fragments belong to the same strobile, and the 18-millimeter 
piece belongs to the 155-millimeter strobile. 
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