PROCEEDINGS OF THE BRITISH ASSOCIATION. 
91 
had been caught at Hornsea Moor, in Yorkshire; another had been killed at 
Scarborough, and a third, stated to have been shot in the neighbourhood, was in 
the possession of Mr. Foljambe, of Osberton.—Mr. Strickland also gave a 
description, and exhibited a drawing, of a large fish of the Shark tribe that had 
been caught on the East coast of Yorkshire. 
Mr. Fox was glad to find that Arclea alba was really a British visitor : it had 
been described as such more than fifty years, but rejected in recent catalogues.* 
He inquired if any ornithologist had seen Ardea candidissima in this country ; he 
believed it was very common to find this species under the name of the Little 
Egret ( A. egretta) in the museums of this country. He believed they were 
generally foreign specimens.—Mr. Selby had never heard of A. candidissima 
being shot in this country.—Mr. Yarrell thought the fish would be found to 
resemble one brought from Africa by Dr. Smith ; it certainly was different from 
any he had ever seen or heard of as caught on this coast. This fish he thought 
belonged to the genus Scyllium , of Cuvier ; but Dr. Smith had found it necessary 
to subdivide that genus, and this animal might be referred to the group thus 
separated from the species originally placed in the genus, 
Thursday. 
Sir Wm. Jardine being absent, Dr. Greville took the chair, and introduced 
to the Section Prof. Ehrenberg. The Professor, who spoke in French, then 
proceeded to lay before the Section an account of his discoveries among the 
Infusoria . He had with him a copy of his large work on this subject, with 
which he illustrated his remarks, observing that he should never complete it, as 
the subject was so extensive. He exhibited to the Section a bottle containing 
a kind of earth from Lake Lettnaggsjdu, in Sweden, called Bergmeh by the 
inhabitants, and which he stated to be composed almost entirely of fossilised 
animalcules, which accounted for its reputed nutritive properties. 
Professor Rymer Jones took this opportunity of stating to Prof. Ehrenberg, 
that he had not been able satisfactorily to confirm all his discoveries, especially 
the intestinal column to which he supposed the gastric vesicles were attached. 
In Paramecium aurelia , he had distinctly observed a rotatory motion of these 
vesicles, which was quite inconsistent with the idea of their being attached to a 
central column. 
Prof. Ehrenberg replied, that it was very difficult to detect the central canal, 
and that Paramecium aurelia was a bad subject in which to discover it. He 
had, however, been led to his conclusions by a long series of observations on the 
* We are at a loss to know to what catalogues Mr. Fox alludes. Selby, Jenyns, and all our 
best modern ornithologists, admit Ardea alba as a straggler in Britain, on the authority of Mon¬ 
tagu, Latham, &c.—Ed, 
