236 TJic American Geologist. October, i898 
REVIEW OF RECENT GEOLOGICAL 
LITERATURE. 
Ueber die Verbreitung der Eulotna-Niobe-Fatma {der Ccrdtopygi 
kalk fnuna) in Europa., Von Prof. Dr. W. C. Brogger Nyt Mag. for 
Naturvidensk, B. XXXV, S. 164-240, Christiania, 1896. 
This is a remarkably comprehensive essay treating of the border- 
land between the Cambrian and Ordovician systems. Dr. Brogger 
takes up in turn the various regions where the fauna of the Cera- 
topygi limestone (for which he prefers the name Euloma-Niobe Fau- 
na) has been found and compares the forms of this fauna with each 
other. In many cases the close resemblance of these regional faunas 
has not been evident because the forms have been ranged under dif- 
ferent genera by the several authors who have described them. Dr. 
Brogger correlates these forms with a master hand and makes a 
strong plea for the point he urges, namely the relation of this fauna 
to the Ordovician system. He first revises the fauna in Languedoc 
described by Munier-Chalmas and Bergeron as follows: 
Calymenopsis filacovi becomes Euloma filacovi. 
Dictyokephalites villebruni becomes Harpides villebruni. 
Amphion escoti is compared to Amphion primigenus Ang. 
Ogygia ligniersi Berg, becomes Niobe ligniersi. 
Eglina sicardi Berg, becomes Symphysurus sicardi. 
Asaphelina miqueli Berg, represents a new genus. 
Asaphelina barroisi M-C & B, becomes Dicelocephalina barroisi. 
Megalaspis filacovi equals Megalaspides? (s. gen.) filacovi etc. 
It has long been known that Salter's old names for the genera 
of the Trunadoc slates needed revision and no abler paleontologist 
than Dr. Brogger could have undertaken the task. As a result of 
his examination we find the following presentation of the genera: 
Niobe homfragi is compared to N. nisignis Linrs. 
Platypeltis and Psilokephalus (2 species) is compared to Symphy- 
surus incipiens Brogg. 
Ampyx parnuntius is compared to A. domatus Ang. 
Dikelokephalus furca is compared to Dikelokephalina dicraura 
Ang. 
Angelina sedgwickii is compared to Parabohinella limitis Brogg. 
Conocoryphe, 2 species, is compared to Cyclognathus micropygus 
Linrs. 
Agnostus dux is compared to Agnostus sidenbladhi Linrs. 
Conocoryphe invitus is compared to Apatokephalus serratus Boeck. 
C. monile is compared to Eulo ma ornatum. 
C. abditum is compared to Euloma ornatum. 
The faunas of Bavaria, of Bohemia, of North America and other 
regions, of this age, are similarly treated, and much light thrown upon 
the relations of the old genera and the species found in these re- 
spective countries. 
