TRANSLATION. 
On the Deve.ormen’ of the Eaes of FLoscuLaris ORNATA, Ehr. 
By Dr. J. F. Wetssz, of St. Petersburg. 
(‘ Zeitschrift f. wiss. Zool.,’ xiv, p. 107, pl. xiv, a:) 
Wauitsr the author, in the course of last summer, was 
pursuing his investigations on the eggs of the Rotatoria, he 
noticed on the 15th of August a beautiful example of 
Floscularia ornata, together with four minute ova, which had 
been already deposited in the aquarium. A fifth ovum, 
which was still contained within the maternal body, was 
expelled under his eyes on the following morning, by a 
forcible contraction of the animal. The germinal yesicle 
was still present, and it differed, moreover, from the other 
ova in the circumstance that the embryo, whose motions 
became more and more lively, remained in this condition the 
whole of the following day, exhibiting at times movement 
of the difficultly seen pharynx. It was not till the 20th 
that the egg was ruptured at the end where the ciliary 
motion had been perceived. The little animal crept slowly 
about with a worm-like movement, and now exhibited very 
distinctly the circle of cilia at its anterior extremity. When 
completely liberated, it might be about twice the length 
of the egg, but it had not the slightest resemblance to the 
parent, so that any one accidentally coming across such an 
animalcule under the microscope might readily mistake it 
for a newly discovered species. The author, therefore, gives 
a figure of the contents, which were slightly separated from 
the shell at either end (fig. 1). 
Up to the 17th of August he was unable to perceive any 
striking change in any of the ova, except that in one of 
them there appeared in the course of the day a minute red 
point, which seemed to change its place, although he was 
unable actually to witness any movement init. But, on the 
VOL. IV.—NEW SER. U 
