ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 
321 
this interesting paper. Some new forms are also described, e. g. JPonti- 
gulasia sjpiralis g. et sp. n. 
Eozoonal Structure.* — Prof. H. J. Johnston-Lavis and Dr. J. W. 
Gregory have described the eozoonal structure of ejected blocks of Monte 
Somma, a subject of zoological interest in connection with the discussion 
as to the real nature of Eozoon canadense. In all essential points the 
ejected blocks agree with the typical Canadian Eozoons, and the authors 
therefore claim to have proved that Eozoon canadense has been formed at 
a period geologically recent, as a product of contact-alteration combined 
with the absorption of a magma of basic silicates. 
Reputed Organic Remains in the Precambrian Rocks of Brittany . | 
— Herr Hermann Rauff criticises in detail M. L. Cayeux’s statements t as 
to the presence of sponge-spicules and Radiolarian tests in these rocks. 
He has studied one of M. Cayeux’s rock-sections containing the alleged 
spicules, and finds that all these show irregular thickenings, spiral 
twisting round their own axes, and worm-like bending, characters very 
rarely found combined, even in very abnormal sponge-spicules. Further, 
he finds that the “ spicules ” not infrequently cross the veins and fissures 
of the rock, and are never atfected by the veins ; this shows that the 
“ spicules ” are younger than the rock, younger even than its meta- 
morphosis. The spicules are therefore growth-forms of iron, probably of 
pyrites. The author then goes on to criticise the so-called Radiolarians, 
laying especial stress upon the fact that they are ten times smaller than 
all other known forms. His own view is that they are pseudomorphous 
granules of pyrites. 
* Sci. Trans. Roy. Dublin Soc., v. (1894) pp. 259-85 (5 pis.). 
f Jahrb. f. Mineral., i. (1896) pp. 117-38 (16 figs.). 
X Bull. Soc. Geol. France, xxii. (1894) pp. 197-228 (1 pi. and 2 figs.) ; Comptes 
Rendus, cxviii. (1894) pp. 1433-5 (6 figs.); Ann. Soc. Geol. du Nord, xxiii. (1895) 
pp. 52-65 (2 pis.). 
