417 
On the early staycs in the Development of Phyllodoce 
maculata. By W. C. McIntosh, M.D. Annals ancl May. 
Nat. Hist., August, 1869. — Dr. McIntosh hatched the eggs 
of this species, which he kept in an aquarium. His observa- 
tions relate to the early stages before any segmentation has 
begun to manifest itself, and agree very well with those re- 
corded in the paper above on a species of Phyllodoce. 
Microzoology — Remarks on Acanthocystis viridis, Ehbg. 
By Dr. Grenadier, of Wurzburg. — This is one of the 
actinophryoid Iladiolarians of which Mr. Archer has done 
so much to extend our knowledge in the pages of this journal. 
Dr. Grenadier gives a very excellent drawing of the species, 
which he has studied with great care, and his description is 
dear and detailed. He remarks very happily that, from a 
Darwinian point of view, we may consider these freshwater 
simpler forms of Radiolaria as hearing the same relation to the 
more elaborate, and vastly more numerous, marine forms of 
the group, which the little freshwater hydra? bear to the great 
group of hydroid polyps inhabiting the sea. 
The Anatomy of the Bed Bay. By Leonhard Landois, 
of Greifswald. Koll. and Sieb. Zeitschrift . Pit. 2 (1869). 
Plates. 
Miscellaneous — British Association.' — Further Observa- 
tions on Dendroidal Forms assumed by Minerals. By Dr. 
Heaton, of Leeds. — The object of this communication was to 
draw attention to the peculiarities of the dendroidal forms de- 
veloped upon some purely mineral crystals when immersed in a 
weak solution of silicate of soda, and to make some additions to 
the observations upon this subject read at the meeting of the 
Association at Dundee in 1867. As was then pointed out, 
wdien crystals of sulphate of iron, sulphate of copper, or some 
other salts, but preferably sulphate of iron, are immersed in 
a dilute solution of silicate of soda, in the course of a few r 
hours branches, exactly like those of some vegetation, shoot 
perpendicularly upwards, being straighter in a rather stronger 
solution, more contorted, and sometimes distinctly spiral, 
when the solution is somewhat more dilute ; though it is only 
within certain limits of dilution that any satisfactory result 
can be obtained. The trunks of these mineral vegetations 
occasionally ramify and subdivide, and sometimes two parallel 
branches, after growing side by side for a time, will again 
unite or anastomose with a single trunk. At their base, 
those developed on sulphate of iron may have a diameter of 
v'o inch ; as they elongate they gradually become narrower, 
ultimately terminating in fine needle-shaped extremities. 
Dr. Heaton had stated at Dundee his opinion that the 
