10) NOTES ‘ON EXHIBITS 
‘a thunder storm in these latitudes, enters the foot of a gully 
down which a small creek flows, and gathering strength both 
from its confined position and on account of the enormous 
pressure both behind and above it, compelled to take the 
only available duection—forward—it would, as the gully 
grew narrower towards its upper end, be forced more and 
more down to the surface of the ground, with the effect that 
all movable objects thereon would be carried along, and on 
reaching the head and meeting a contrary current of air 
would be whirled up to the skies to come down again per- 
haps many miles from their point of departure ; a small 
stream of water flowing in an opposite direction to such a 
storm would be easily sucked up with allit contained. For 
the sake of comparison I exhibit a fine specimen of the “‘ Crim- 
son-spotted Trout-Gudgeon ” (Krefftius adspersus, Ogilby), 
which is also abundant in the creeks round Brisbane (Ex- 
hibit F). If this beautiful species be kept in an aquarium, 
it should, when full grown, be associated only with fishes as 
large or larger than itself, as it has cannibalistic propensities, 
which lead it to devour its own and other fry, while speci- 
mens of two inches and even more are not immune, as it 
will attack them and gnaw off their fins. 
My last exhibit (G) is a remarkable bone from the head 
of a selerode matous fish (either Balistes or Monacanthus), 
which appears to be an excrescence resultant on an injury, 
as it is not equally developed on both sides. The curious 
trigger-like apparatus by which these fishes are enabled to 
lock the first dorsal spine in an erect position for defensive 
purposes, is well shown in this exhibit, which has been lent 
to me by Mr. Squires. 
