1182 General Notes, [November 
epochs. But when we know that the deep-sea distribution of 
animals is determined, not by temperature, but by light, we may, 
with perfect justice, assume that the fundamental features of the 
bathymetrical distribution of marine organisms have mainly a- 
ways been the same as now. | 
VAMPYRELLA HELIOPROTEUS, A NEW Moneron.—T. W. Engle 
mann describes this new organism, which he found among Cor 
ferve in the neighborhood of Utrecht. It is distinguished from | 
all previously known forms by the “ heliozoa-form ” (globular, 
with long pseudopcedia), being able to pass over into “a 
flat, discoid amceba-form. This metamorphosis was observed it 
three instances, and extended over about five minutes. In the 
heliozoa-form the organism moves by means of its long, contrat 
tile pseudopodia, like an Actinosphcerium; in the a d 
uoles. The author adduces, from the discovery of this organist | 
a fresh argument against drawing any sharp line between teti 
ferent sections of the Protista.—/ourn. R., Micr. Soe. = 
DIMORPHISM OF FORAMINIFERA.—MM. Meunier-Chalmas # 
Schlumberger, attracted by the discovery by one of them a” q 
presence of two forms in every species of Nummulite, have 
directed their attention to the Miliolidæ, where they have 
served similar phenomena; so that dimorphism is to be d 
in both the great divisions of the Foraminifera—Perforala 
a 
Imperforata. The dimorphism of the Foran? r 
to the general view that they consist not of cellula 
a structureless protoplasmic mass. He finds er thes 
not only consist of cells, but that an ectoderm an 
‘jt, is 
derm of the stem. The ectoderm, which covers 1t, is 
1 Bull. Soc. Zool. France, vit (1882), pp. 280-1. 
