328 Notices of Vemoirs—Prof. FE. Kayser—U. Devonian. 
IJ.—Beritrac zur KeEnntTNIss DER MIKROFAUNA AUS DEN OBER- 
JURASSISCHEN F'EUERSTEINKNOLLEN DER UMGEGEND VON KRaAKAU. 
Von Tuappaus Wisniowsxi. Jahrb. der k. k. geol. Reichsanstalt, 
1888, Bd. xxxiv. pp. 657-702, taf. xii. xiii. 
Nores on tHE Microscopic Fauna FROM THE Upper Jurassic FLINT- 
NODULES IN THE NEIGHBOURHOOD oF Cracow. By THADDEUS 
WISNIOWSKI. 
N the limestone strata of the White or Upper Jura formation near 
Cracow there are layers of flint nodules similar to those in the 
Upper Chalk of this country. The flints vary from dark to grey 
in tint, in the latter a great variety of microscopic organisms can 
be distinguished. These principally consist of detached sponge- 
spicules, some of which are very perfectly preserved, whilst others 
have been dissolved and only the infilled casts of their canals 
remain. The spicules evidently belong to a variety of siliceous 
sponges, the monactinellid and tetractinellid forms predominating. 
There are also some minute forms resembling the flesh-spicules of 
existing hexactinellids. In the flints from one particular locality 
radiolarians appear instead of sponge-spicules; of these 19 different 
species have been recognized by the author, and ten are new. 
Foraminifera are also fairly abundant in the flints mingled with 
the siliceous organisms; but as only their infilled casts have been 
preserved, it has not been practicable to distinguish more than 
10 species. In contrast to the abundant remains in the grey nodules, 
there are very few to be found in those of a dark tint; but as there 
are numerous gradations between these two varieties, it is reasonable 
to conclude that the silica in both bas been derived from the same 
organisms, and that these have been completely dissolved in the 
dark nodules. Figures of the different forms are given in the 
accompanying plates. Gere daly 
I1].—Uerser pas Devon 1n DEVoNSHIRE UND IM Bovutonnals. Von H. 
Kayser 1n Marsure. Neues Jahrbuch ftir Mineralogie, etc. 
1889, Bd. I. pp. 179-191. 
ROF. KAYSER (in company with Prof. Gosselet, of Lille, and 
some other geologists) visited the classical region of North and 
South Devon last autumn under the guidance of Mr. W. A. H. Ussher, 
and in this paper he gives some details of considerable interest. 
regarding the geological structure and fossils of these areas as 
compared with the corresponding strata in Germany. Prof. Kayser 
concludes that in South Devon there is the closest resemblance, alike 
in the Upper, Middle, and Lower divisions, to the Devonian suc- 
cession in West Germany, and this is further shown by the occurrence 
of similar eruptive greenstones in both countries. On the other 
hand, considerable differences are shown in the North Devon Series. 
There are here no representatives in the Upper Division either of the 
Clymenia Limestone, or of the Adorf Goniatite, or the Iberg Coral- 
limestone; in the Middle Division the Stringocephalus and Calceola- 
limestones are wanting, and there is no near resemblance either in 
