ZOOLQGY. 767 
ACER NIGRUM witH SripuLes.—Mr. J. F. Mills sends a branch 
of a black maple in which well-formed foliaceous stipules are 
developed, their bases adnate to the petiole. The peculiarity is 
confined to a single tree, and the like has not been seen before in 
maples, so far as we know. Mr. Mills should inform us if the 
peculiarity is reproduced next year.—A. G 
A Srawreep New ro our Coast.—This alga (Hildenbrandia 
rosea Kunze) occurs at Mt. Desert, in rocks between low and high 
water, in similar situations in Massachusetts Bay (Weymouth, 
Fall River and at Nantucket), and probably all along the coast. 
—H. Witter, New Bedford. 
ZOOLOGY. 
EMBRYOLOGY or CHELIFER AND PuaLaneium.— Prof. Metschni- 
koff, the Russian embryologist, has lately published in Siebold and 
Kolliker’s Zeitschrift, an account of the embryology of Chelifer, 
of which our C. cancroides (Fig. 151) is an example. He remarks 
in closing “that in view of the great morphological and anatomical 
similarity between Chelifer and the scorpions we might expect 
that these animals would be alike in their’ 
embryological development. But obser- 
vation shows that the mode of develop- 
ment of Chelifer reminds us much more 
of that of the lower Arachnids, namely, 
the Pycnogonids.* The first embryolog- 
ical occurrence, the segmentation of the 
yoik, is total in Chelifer, as in the Pyc- 
nogonids, Pentastoma and Tardigrades, 
while the eggs of the true scorpions 
undergo a kind of partial segmentation. 
The most peculiar phase in the develop- 
ment of Chelifer, namely, the formation 
of the larva and its metamorphosis, is at all events much more 
like the development of the Pycnogonids than the scorpions. I 
Fig. 151. 
nena 
C. cancroides, 
: * T} y perhaps the majority of ae SEES 
Dr. Dohrn co oncludes from a ad of ‘their ganar tie e ‘The Pycnogonidæ 
= Neither Arachnida nor Crustacea; sabe e an ne Be reny uate no relationship, 
with the latter they have, as a comm gi f depart 
$. C E 
i ay z08a form. 
