110 AVIAN ENTOZOA—LINTON. 
where the proboscis was completely retracted the bothria were directed 
forward. The average breadth of the head of three specimens was 0.2 
millimeter; length of hooks, 0.055 millimeter ; length of the proboscis, 
0.14; diameter at base, 0.04; diameter at apex, 0.08; and diameter of crown 
of hooks, 0.13 millimeter. The specimens were forthe most part small, 
measuring trom 8 to 13 millimeters in length. One fragment (Figs, 91, 
92) was 20 millimeters in length, its posterior segments 0.4 miilimeter 
long and 1.4 millimeters broad. 
In these specimens calcareous bodies were exceedingly numerous. 
Reproductive organs as in those from Fuligula vallisneria. 
HapiraT: Fuligula vallisneria and Cidemia americana, intestine, 
Yellowstone Lake, Wyoming, August, 1890. 
WASHINGION and JEFFERSON COLLEGE, 
Washington, Pa., August 1, 1891. 
EXPLANATION OF FIGURES. 
[ Figs. 64 and 65 from life; all others trom alcoholic specimens and drawings by the 
the author. } 
PLATE LY. 
Filaria serrata, sp. nov., from Circus cyaneus var, hudsonius. 
Fig. 1. Optical section of head, lateral view, x 350. 
Fig. 2. Superficial view of same. 
Fig. 3. Diagram of posterior end, ventral view, showing arrangement of anal papilla 
of male. The small post-anal pair on the right side were not clearly shown 
in the specimen. 
Fig. 4. Copulatory spines, lateral view, X 225. 
Ascaris spiculigera Rudolphi, from Pelecanus erythrorhynchus and P. fuscus. 
i} g ’ y 
Fig. 5. Adult female from stomach of host, xX 10. v, reproductive aperture. 
Fig. 6. Head of male, X 36. 
Fig. 7. Another view of same, X 36. 
Fig. 8. Posterior end of female, x 36. 
Fig. 9. Ovain which segmentation has begun, X 225. a, morula; 6, gastruta stage. 
Fig. 10. Diagram of posterior end, ventral view, showing arrangement of anal papillw 
in male. 
Fig. 11. Lateral view showing copulatory spines, Xx 36. 
Fig. 12. Anterior portion of alimentary canal, x 14. m, mouth; 0, esophagus; 4, 
intestine. 
Echinorhynchus reclus, sp. nov., from Larus sp. 
Fig. 13. Male, slightly compressed, x 6. This and the three following sketched from 
specimen in oil of cloves. 
Fig. 14. Female, slightly compressed, x 6. 
Fig. 15. Hooks near base of proboscis, X 225. 
Fig. 16. Hooks near apex of proboscis, x 225. 
Fig. 17, Bursa of male, showing nucleated cells in walls, X 27. 
ns 
