1046 The American Naturalist. [December, 
rail, was constant and seemed to come from every tree; but during 
our progress through the thicket the voices immediately around us, for 
a radius of about 25 feet, were silent. This circumstance and the on- 
coming darkness made it difficult to secure specimens, although the 
frogs were so abundant. The two secured were found perched on the 
lower sides of branches of the pines with dilated and vibrating throats, 
though at the moment they were silent; and it was noted that they 
emitted an odor which was likened to that of raw green peas. The 
color above in life was a bright pea green, quite unlike the dull olive 
green of spirit-preserved specimens. The lateral stripe was of a very 
rich velvety purple. The following morning we could find no trace 
of them, but later in the day heard another chorus in the middle of a 
dense swampy thicket. Since then Mr. H. F. Moore and myself have 
repeatedly visited the locality in quest of the Hyla and its eggs, but 
entirely without success. To the natives the frog is unknown.—J. 
Percy Moore. 
Yolk Nucleus of Cymatagaster.—J. W. Hubbard, in a 
- paper,’ the proof-reading of which could be better, shows that the 
yolk nucleus in these fish eggs is produced from the true nucleus, 
soon after the cell becomes differentiated as an egg, that it migrates 
towards the vegetative pole, and after the closure of the blastopore, 
it breaks up and disappears in the yolk. He claims that the same 
structure occurs in many eggs and has been mistaken for the 
spermatozoon, and thinks it homologous with the meganucleus of the 
Protozoa, a conclusion which needs more support than is advanced in 
the paper. The review of the literature omits several important 
papers. 
Zoological News. Prorozoa.—Gruber, in his Amóben-Studien,* 
comments on the great rarity of observations on the division of the 
Ameeba, and especially calls attention to the absence of any observa- 
tions upon the mitotic division of the nucleus. He calls upon other - 
observers to make observations on this point. He has had an oppor- 
tunity of directly comparing Rhizopods from Massachusetts and from 
the Black Forest, and says that the forms from the two localities are 
identical. Some remarks are made upon specific characters in the 
Rhizopods. 
CaLENTERATA.—Grieg, in a paper but recently received,’ cata- 
logues 30 species of Pennatulida as belonging to the Norwegian fauna. 
* Proc. Am. Philos. Soc., xxxiii, 1894. 
* Bericht Naturf. Gesellsch., Freiburg, viii, 1894. 
7 Bergens Museums hadenn for 1891, 1892. 
