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aa PROCEEDINGS OF THE NATIONAL MUSEUM. 89 
tenth as long; the extremity of each is bent around into a short hook 
(Fig. 4). Lips, two, lateral, with three tooth-like processes on inner 
side of each. Pharynx short, and with what appears to be a chitinous 
ring at the base. The body is crossed by transverse striw, which give 
the cuticle a segmented appearance, being sharply serrate on the mar- 
gins in optical section. The transverse striz are 0,008 millimeter apart. 
The anal papillz were not as satisfactorily made out as could be de- 
sired, but appear to have the arrangement shown in the diagram (Fig. 3). 
~The papille on the left side are fungiform, with comparatively broad | 
disks. Those on the left side and the four small post-anal papille near 
the caudal extremity were plainly seen, while those on the right side 
were made out by focussing down through the overlapping ala, and were 
not so satisfactorily seen. 
Ascaris spiculigera Rudolphi. 
(PI. Iv, Figs. 5-12.) 
Diesing, Syst. Helm., H, 157, Revis. der Nem., 658. 
Leidy, Proceed. Acad. Phila., 1858, p. 102; 1890, p. 411. 
Schneider, Monogr. der Nem., p. 45; Pl. 1, Fig. 14. 
v. Linstow, Zo6l. of the Voyage of H. M. S. Challenger, Part Lxx1, pp. 3, 4, Pl. 1, 
figs. 5-7. 
This nematode was found in immense numbers in the White Pelican 
(Pelecanus erythrorhynchus), Yellowstone Lake, Wyoming, August, 1890. 
Two birds yielded 820 specimens. 
Two lots of this parasite from P. fuscus collected by Mr. P. L. Jouy, 
at Guaymas, Mexico, February, 1891, (National Museum ace. 24137, 
Nos. 971,974), have also been submitted to me for examination. These 
lots contain 45 and 102 specimens respectively, being in each case the 
number found in a single bird. I make the following extract from 
Mr. Jouy’s letter: 
The gular pouch and stomach were infested with worms. They were found spar- 
ingly inthe throat and pouch of the birds, becoming more abundant in the stomach, 
at the bottom of which they were a mass with the partially digested fish. <A few of 
them were slightly attached to the skin of the pouch or stomach and required a 
slight pull to release them, No parasites of any kind were found in the intestines 
of this bird. . 
The largest females among the Guaymas specimens measured 34 
millimeters in length and 1.5 miltimeters in diameter; the largest 
males 28 millimeters in length and 1.5 millimeters in diameter. The 
smallest specimens measured 7.5 millimeters in length and 0.35 milli- 
meter in diameter. 
Following are the dimensions of two of the largest specimens: 
' 
\ 
| ? 3 
mm. mm. 
THCY Tein, cit Saeco c CBORD BOGE BE SEC DONDE OSR oS Aaeaas 32.00 | 20. 50 
Greatest diameter ets... 22 c<h ceteeacsede as oe 2 10E| eit. 50 
Diameter of body, anterior end.-.-...- Seseechicenas .55 . 40 
Diameter of head............ Basse wece tee et aes: . 30 ~ 20 
