NATIONAL FISHERY CONGRESS. 
199 . 
in most cases occurred in comparatively small numbers in the several hosts. The 
only fish in which I found numerous adult nematodes was the swordfish ( Xipliias 
gladius). These worms were referred to the species Ascaris incurva Rudolphi. They 
were found in the stomach and were of different sizes, from immature, filiform speci- 
mens up to large, plump individuals 250 mm. in length. The largest of which I have 
any record was 267 mm. in length and 3 mm. in diameter. 
I pass over cases of external parasites of fishes, leeches, lerneans (fish lice), etc., 
as not coming within the proposed scope of this paper. 
Washington, Pennsylvania. 
Partial list of American authorities on fish parasites, especially such as have been published by the U. S. 
Fish Commission and the U. S. National Museum. 
PROTOZOA. 
1. On certain wart-like excrescences occurring on the short minnow, Cyprinodon variegatus, due to 
psorosperms. Edwin Linton. Bulletin U. S. Fish Commission for 1889, pp. 99-102, pi. xxxv. 
2. Notice of the occurrence of protozoan parasites (Psorosperms) on cyprinoicl fishes in Ohio. Edwin 
Linton. Bulletin U. S. Fish Commission for 1889, pp. 359-361, pi. cxx. 
3. On the classification of the Myxosporidia, a group of protozoan parasites infesting fishes (issued 
July 15, 1893). R. R. Gurley. Bulletin U. S. Fish Commission for 1891, pp. 4C7-420. 
4. Report on a parasitic protozoan observed on fish in the Aquarium. C. W. Stiles. Bulletin U. S. 
Fish Commission for 1893, pp. 173-190, pi. 11, 12. 
5. The Myxosporidia, or psorosperms of fishes, and the epidemics produced by them. R. R. Gurley. 
Report U. S. Fish Commission for 1892, pp. 65-304, pi. 1-47. 
HELMINTHA. 
6. On a skin parasite of the cunner ( Cienolabrus adspersus) . John A. Ryder. Bulletin II. S. Fish 
Commission for 1884, pp. 37-42. 
7. Notes on entozoa of marine fishes of New England. Edwin Linton. Report U. S. Fish Commission 
for 1886, pp. 453-511, pi. i-vi. 
8. Notes on entozoa of marine fishes of New England, Part II. Edwin Linton. Report U. S. Fish 
Commission for 1887, pp. 719-899, pi. i-xv. 
9. Notes on entozoa of marine fishes, Part III. Edwin Linton. Report U. S. Fish Commission for 
1888, pp. 523-542, pi. liii-lviii. 
10. The anatomy of Thysanocephalum crispum, a parasite of the tiger shark. Edwin Linton. Report 
U. S. Fish Commission for 1888, pp. 543-556, pi. lxi-lxvii. 
11. On two species of larval dibothria from the Yellowstone National Park. Edwin Linton. Bulletin 
U. S. Fish Commission for 1889, pp. 65-79, pi. xxm-xxvii. 
12. A contribution to the life-history of Bibothrium cordiceps, a parasite infesting the trout of Yellow- 
stone Lake. Edwin Linton. Bull. U. S. Fish Commission for 1889, pp. 337-358, pi. cxvn-cxix. 
13. On fish entozoa from Yellowstone National Park. Edwin Linton. Report U. S. Fish Commission 
for 1889-1891, pp. 545-564, pi. 63-67. 
14. Some observations concerning fish parasites. Edwin Linton. Bulletin U. S. Fish Commission for 
1893, pp. 101-112. 
15. Notes on larval cestode parasites of fishes. Edwin Linton. Proc. U. S. National Museum, vol. xix 
(1897), pp. 787-824, pi. lxi-lxviii. 
16. Notes on cestode parasites of fishes. Edwin Linton. Proc. U. S. National Museum, vol. xx (1897), 
pp. 423-456; pl.xxvn-xxxiv. 
17. Notes on trematode parasites of fishes. Edwin Linton. Proc. U. S. National Museum, vol. xx (1897), 
pp. 507-548; pi. xl-liv. 
18. Some notes on the biological relations of the fish parasites of the Great Lakes. (Abstract.) H. B. 
Ward. Proceedings of Nebraska Academy of Science, iv, pp. 8-11. 1894. 
19. Notes on the structure and life-history of Bistoma opacum, new species. H. B. Ward. Proceedings 
of American Microscopical Society, vol. XV, pp. 173-182, with plate. 
