292 CARNEGIE INSTITUTION OF WASHINGTON 
total of 80 species of fishes, or about 46 per cent of the different kinds of 
hosts examined. Inasmuch as the incidence of nematode infestation for a 
given species is usually low, further work will very materially increase 
the number of hosts known to bear nematodes occasionally. 
Multiplication of species within a given host does not occur with the 
nematodes to the extent that it does with the trematodes. Not more than 
four kinds of nematodes were found in any one species of fish, and it is not 
expected that this number will be greatly increased. Furthermore, the 
number of nematodes parasitizing a single fish was found to be small in 
most cases. Extremely heavy infestations were found only in three 
groupers, Epinephelus morio , Mycteroperca bonaci and Mycteroperca 
venenosa. In these fishes, hundreds or even thousands of larval nematodes 
had become encysted throughout the viscera, being particularly abundant 
near the ends of the pyloric cceca. 
Approximately two-thirds of the nematodes collected represent larval 
stages. Nearly all of these larvae are sufficiently advanced, however, to 
make possible their identification. Although only a few of them have been 
determined as yet, it appears that many will prove to be the immature 
forms of species which normally mature in birds. With the completion 
of the study of the larval nematodes of fishes, a good starting point for 
life-history studies of the nematodes of marine birds may be found. 
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