890 General Notes. l [August, 
tinguish yellow and green light, and that they prefer either to 
white light. No such result was given with blue or red solutions, 
In such cases the Daphniz always preferred the uncovered half 
of the trough in which the experiments were made. It was, of 
course, impossible absolutely to prove that these creatures per- 
ceived colors; but these experiments certainly showed that rays 
of various wave-iengths produced distinct impressions on their 
eyes; that they preferred rays of light of such wave-lengths as 
produce upon our eyes the impression of green and yellow. On 
the whole, he concluded that Daphnia can distinguish not only 
different degrees of brightness, but also differences of color— 
The paper of Csokor on the pig Demodex (D. phylloides) has been 
translated into the Proceedings of the Canadian Institute by Pro- 
fessor R. R. Wright. These mites cause the formation of subcu- 
taneous abscesses frequently as large as a hazel nut. Its occur- 
rence in Canada was announced by Wright in the NATURALIST for 
December last. 
pearing in the Proceedings of the United States National gree 
r 1882. Eurypharynx pelecanoides, according to the i ree 
tions copied from the Magasin Pittoresque, is certainly one cupy- 
most singular of earth’s inhabitants. The head is short, sp 
ing about an inch and a quarter out of the more than pe gio: 
inches of the length of the fish, yet the mouth is capable ot € ns 
mous dilatation from the structure of the jaws. The suspensor gee 
ium is exceedingly long, and the mandible, of two ee back, 
ures about four inches. Thus the articular angle lies o jong 
along the side of the body. The upper jaw consists O ruken- 
and slender stylet, probably the intermaxillary——Hertt ically 
berg, of Heidelberg, has studied chemically and specie ae 
the different pigments that he has extracted from the Spt | 
birds. Most of these are red or yellow; green pigments : 
