FISH PARASITES COLLECTED AT WOODS HOLE IN 1898. 
By EDWIN LINTON, Ph. D., 
Professor of Biology , Washington and fefferson College. 
The following report is divided into two parts. 
In Part 1 a list of the hosts which were examined, or from which parasites were 
obtained, is given. In each instance brief mention is made of the parasites found, the 
dates of examination are given, and where the stomach contents were noted a record 
is entered. In nearly every case in which no note was made of stomach contents the 
stomachs were empty. 
Adult trematodes and cestodes and a few nematodes have been identified. Many 
larval cestodes and most of the nematodes have not yet been identified. 
The order of arrangement of hosts is substantially that of Dr. H. M. Smith, “The 
Fishes found in the Vicinity of Woods Hole” (Bulletin of the United States Fish 
Commission for 1897). 
In Part II descriptions are given of new species and of species new to the region. 
While this report has mainly to do with the entozoa, I have given descriptions of 
two ectoparasites: (1) A copepod, found in the cheek of a squeteague (Cynoscion 
regalis). (2) A tristomum (JEpibdella bumpusii sp. nov.), from the skin of a stingray 
(Dasyatis centrura). In the description of the latter are incorporated some observa- 
tions on the process of egg-making as it was seen in this interesting species. 
PATHOLOGICAL CONDITIONS. 
It was under consideration to arrange in a third part such cases as might be 
referred to as pathological or diseased conditions. This proved undesirable, since it 
would have caused needless repetition. For convenience of reference, however, are 
here arranged the principal cases where damage, more or less serious, resulted to the 
tissues of the host from the presence of parasites. 
1. Cyst with trematode: ova, p. 297, figs. 82-84. 
2. Immature distoma encysted in the skin of the 
cmmer, p. 296, figs. 76-81 . 
3. On the occurrence of cysts in the stomach- wall 
of the blue-fish, p. 301, fig. 101. 
4. On cysts in the stomacli-wall of the hlack sea 
bass, p. 301, figs. 103, 104. 
5. Cysts from kidneys of scup, p. 301. 
6. AcanthoclieUus nidifex, p. 303, fig. 116. 
7. Cyprinodon variegatus, p. 277. 
8. Galeocerdo tigrinus (not due to entozoa), p.270, 
tig. 102. 
9. iVorone americana, p. 279. 
10. Catostomus commersonii, p. 276. 
In this connection reference may be made to Tetrarhynchus bicolor, which was 
found burrowing into the stomach coats of the leopard shark ( Galeocerdo tigrinus ), and 
to T. elongatus, whose extraordinarily long blastocysts appear to be always present in 
the liver of the sunfish ( Mola mola). Dibothrium plicatum appears to produce more or 
267 
