120 Animal Life 
fish, the pilot acting not only as a scout to scent out provender, but also as a lure to 
attract larger game within striking distance of its adopted protector. The role of utility 
played by the small crab, as also certain species of prawns that are commonly met with 
as fellow commensal guests of the big anemone, is not so obvious. It is probably that 
of scavengers. 
In another little group of fishes, a more essentially parasitic mode of life prevails. 
These are the Fierasfers, of somewhat eel-like shape and semi-transparent consistence, 
which are noteworthy for taking up their abode within the body or mantle cavities of the 
jelly-fish, sea-cucumber or béche-de-mer, and large bivalve molluscs. The large mother- 
From a Photograph by J. Turner-Lurner, reproduced in “The Giant Fish of Florida" (Pearson). 
GAR OR NEEDLE FISH. 
They leap astonishing distances in the air, especially when pursued by a King Fish. 
of-pearl and pearl-producing oyster of the tropical seas is not unfrequently tenanted by 
one of these parasitic fish, and it sometimes happens that either proving itself a 
“thorn in the flesh” to its molluscan host, or dying a natural death within its 
adopted domicile, the shell-fish, unable to eject the offending body, hermetically enshrouds 
it in a sheet of its own pearly substance. One such example that is preserved in 
the collections of the Natural History Museum is represented in the accompanying 
OL prplt /pot- 
ee 
Mr. Saville-Kent has promised to write a third article on this subject, which we hope to publish in some 
future number. 
