oe NOTES ON AVIAN ENTOZOA—LINTON. 
Echinorhynchus striatus Goeze. 
(Pl. v, Figs. 18-25.) 
Diesing, Syst. Helm. 1, 45, Molin. Sitzungsb, d. k. Akad, xxx, 143; Denkschr. d. kK: 
~ 
Akad. x1x, 266, tab. vi, Fig. 7. 
Two small echinorhynchi (Figs. 22-25) from the Black Scoter ((de- 
mia americana) have been referred to the species ZH. striatus, although 
they are considerably smaller than the recorded specimens of this species. 
The specimens are both females, one with embryos and the other with 
large ovarian masses with no embryos. They were found in the intes- 
tine near the coeca, one cream-colored, the other orange yellow. 
The bodies are conical, spherical in front with a constriction near the 
anterior end, echinate in front of constriction, behind the constriction 
the body is smooth, longitudinally striated and terminating in a blunt 
point. The proboscis is larger at the base than at the apex and is armed 
with hooks of nearly uniform size,so disposed that about eight may be 
counted in a transverse spiral on one side and twelve in a longitudinal 
row. The proboscis is partly withdrawn in each of these specimens, so 
that the neck can not be plainly seen. It appears, however, to be coni- 
eal and unarmed. 
The length of these specimens was about 3.3 millimeters. Other di- 
mensions as follows: 
Millimeters. 
Wen et hvotsproW Os Gis ee em sere ele area ie tte ete 0.60 
Diameter of proboscis, apex.--.-.-..----- eels Sesto ee coeaet al) 
Diameter. of: proboscis; base- 2-22. S202. 322s ase e)se mn como 
Length of sheath: 222. anciteeere sae ee eo eee ee .60 
Diameter: of bodys anteriorss-es see eee ee eee eee .80 
Meno thot hooks’ ssocc5 oso saee ee soe eee eminem .05 
Ata distance of 0.4 millimeter from the posterior end the diameter 
was 0.3 miilimeter; 1 millimeter from the posterior end the diameter 
was 0.6 millimeter. One of the eight specimens contained embryos 0.14 
millimeter in length and 0.03 millimeter in diameter; the other con- 
tained ovarian masses, ellipsoidal in shape and 0.14 by 0.06 millimeter 
in their two principal diameters. 
These specimens agree with the following-described specimens in the 
shape and armature of the proboscis and in the spines on the anterior 
part of the body, but differ in their smaller size, conical shape, and the 
absence of spines at the posterior end. 
HABITAT: Mdemia americana, intestines. Yellowstone Lake, Wy- 
oming, August, 1891. 
A small lot of Echinorhynchi consisting of six specimens, all males 
(Figs. 18-21), from another duck which appears to be Gidemia americana, 
not fully grown, agree in several important particulars with the fore- 
going and have been referred to the same species. These specimens 
vary in length from 2.5 to 5.5 millimeters. The smaller ones have cyl- 
indrical bodies with one and in one case two constrictions. The larger 
LCT OAL 
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