1879. | | Zoology. 321 
the entire accuracy of Syrski’s observations and figures, he being 
the first observer, so far as we are aware, who has discovered the 
male sex of the Italian eel. Which species of eel it was that Syrski 
examined is not stated. In making these investigations we have 
to acknowledge the aid of Prof. John Pierce, of Providence, in 
the use of a fine series of mounted histological specimens and 
lenses of high powers. He has worked jointly with us and is of 
our opinion as to the sex of the three males. Dr. Minot exam- 
ined one of the three males, preserved in alcohol, and found as 
Freud and Brock had done previously, a folliclular structure, the 
follicles being filled with small spherical cells, which Dr. Minot 
considered to be probably immature spermatozoa, although the 
development could not be traced.—A. S. Packard, Fr., and F. S. 
Kingsley.“ 
Breepinc HABITS oF THE Dace.—lIn the early part of June, 
1878, an excellent opportunity offered itself for observing the 
breeding habits of the dace (Rhinichthys atronasus). Standing 
“one afternoon upon one of the bridges crossing the river in this 
city, a nest of this fish was discovered in the stream below, it was 
about two feet in diameter, situated in running water from twelve 
passed over the eggs, and then both would proceed up the stream 
from four to ten feet or more, and taking a small pebble in their 
mouths, would quickly return and deposit them on the fecundated 
eggs, sometimes but one fish would go for pebbles, the other lin- 
gering near, thus layer after layer of impregnated eggs and peb- 
bles were deposited one upon the other. These movements were 
watched for two days, when the water became muddy from the 
Spring rains, and further observation was impossible. The wis- 
ner all fresh-water oviparous fish deposit their spawn in (xot upon) 
ae pk heaps we call their nests — W. H. Gregg, M.D., Elmira, 
