112 WAITE: VERTEBRATES OF THE WESTERN AINSTY. 
Perca fluviatilis Linn. Perch. Occurs in both the Nidd and 
the Wharfe, but not plentifully. Those from the Wharfe are 
much finer than the Nidd specimens, but are not to be compared 
to those from Malham Tarn. 
Acerina cernua (Linn.). Ruffe. Pope. This little fish is very 
common in the Wharfe, but I regard it as scarcer in the Nidd. 
It is a practice with the lads when they catch a ‘Tommy Bar,’ as 
it is locally called, to stick a cork on the dorsal fin and let the 
fish go, which, of course, compels the little creature to swim 
at the surface. 
Cottus gobio Linn. River Bullhead. Millers Thumb. 
It occurs in the Nidd, but is not common. It is very plentiful 
in the Wharfe. 
Gasterosteus aculeatus Linn. Three-spined Stickleback. 
Common in both the Nidd and the Wharfe. It also occurs in 
several ponds and ditches in the district, more especially those 
in which the water is freely moving. 
meg const pungitius (Linn.). Ten-spined Stickleback. 
I am indebted to Mr. Francis G. Binnie, of the Edinburgh 
University (formerly of Tadcaster) for the fotlowibiinone on this 
species :—He writes: ‘I owe my acquaintance with this small 
species to my being occupied with the study of aquatic in- 
vertebrata. I found it in a small pond near Healaugh Hall, 
and in another near Tadcaster. In the latter I only became 
aware of its existence on the pond drying up during the hot 
summer of 1868, when, of course, the little fishes were all killed.’ 
Mr. Binnie adds:—‘It thus differs from its ally G. aculeatus 
in a greater tolerance of stagnant water, for I never found the 
latter in small gous but almost invariably in running water of 
ditches, becks, &c. 
Lota vulgaris Cuv. Burbot. Eelpout. This is a rare fish in 
the district. It has, however, occurred in both the Nidd and 
the Wharfe, and Mr. J. W. Grassham tells me that it is not so 
uncommon in the latter river below Tadcaster. He frequently 
meets with it at Ulleskelf. 
Pleuronectes flesus Linn. Flounder. <A few very small 
examples may generally be found in the Nidd. They attain a 
larger size in the Wharfe, which is tidal as high as Tadcaster. 
They are occasionally caught there by means of rod and line. 
One was caught at Thorp Arch a short while ago, but it is not 
easy to understand how it got over the dam at Tadcaster. 
Naturalist, 
