ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
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g. ct sp. n., like Lithocolla globosa F. F. Sell., but without granules in 
the rays ; Estrella aureola g. et sp. n., with numerous fine rays which 
are branched ; E. socialis sp. n. like Microgromia ; Hcliospliserium aster 
g. et sp. n., like Nuelearia, haying a thick gelatinous envelope, but 
spherical or almost spherical in form, with a single nucleus, and un- 
branched rays ; H. polyedricum sp. n., with finer rays, central nucleus, 
and more angular form. 
Pelomyxa palustris and other Low Organisms.* — M. E. Penard 
has a general account of Pelomyxa palustris , but does not present us with 
any new result. P. Belevskii is a new species, found in October, when 
P. palustris had almost disappeared ; it differs by its much smaller size 
and less swollen body, and the presence not of stony particles but of 
vegetable fragments of all kinds. The presence of the refractive bodies 
characteristic of P. palustris has not been demonstrated in the new species, 
but this phenomenon may be seasonal. There are contained in it a 
number of parasites, but the green Protococci which are characteristic of 
every example of P. palustris are always wanting, and that though the 
two species are found in the same pond. 
Other new forms described are Difflugia mammillaris, D . elisa , P. 
urceolata var. lebes , Quadrula discoides, Nebela minor , and N. tenella. 
The author has had the opportunity of investigating Lesquereuxia 
jurassica of Schlumberger, of which he describes a variety that he calls 
epistomium. 
New Marine Rhizopod.f — Under the names of Pontomyxa flava 
M. E. Topsent describes a new form which may, at Banyuls, be fre- 
quently found on Microcosmus Sabatieri, where it forms yellowish spots. 
These do not remain compact, but form ramifications, the filaments of 
which are extremely fine, and frequently more than four or five centi- 
metres long. As the organism has no envelope it is one of the 
Amoebsea, and its pseudopodia show that it belongs to the group Keticu- 
losa. It is characterized by its colour, its large size, the complete 
absence of vacuoles in its mass, and, above all, by the large number of 
its nuclei. In organization it is extremely simple ; there is a hyaline 
nucleated protoplasm and yellow granules ; all the pseudopodia are con- 
tractile, and there is nothing comparable to the permanent and undivided 
filament of Aletrium pyriforme. The nuclei have a diameter of 50-60 p, 
are perfectly spherical, and have a doubly contoured nuclear membrane ; 
by their number and structure they call to mind those of Pelomyxa. 
This form takes, among the Reticulosa, a position comparable to that 
occupied by Pelomyxa among the Lobosa. Cysts have never been 
observed in it. 
Microscopical Fauna of the Cretaceous in Minnesota. + — Messrs. 
A. Woodward and B. W. Thomas give a list, with detailed synonymies, 
of the Foraminifera found in this deposit ; there is a short notice on 
Coccoliths and Bhabdoliths, and still briefer references to Radiolarians, 
Sponges, and Echinoderms. 
* Arch. Sei. Phys. et Nat., xxix. (1893) pp. 165-84 (1 pi.). 
t Arch. Zool. Exper. et Gen., x. (1892) pp. xxxi. and ii. 
j ‘The Microscopical Fauna of the Cretaceous in Minnesota, &c., Final Kep. of 
Geol. and Nat. Hist. Survey of Minnesota,’ iii. (1893) pp. 23-54 (3 pis.). 
