124 The American Geologist. August, 1903. 
The win ile aspect of this fauna is pre-Paradoxidean and one wonders 
what has become of the rich Paradoxides beds of southern Sweden in 
this northern area. A similar hiatus is found in the Cambrian beds of 
the eastern side of the Baltic, and it would seem that there must have 
been a break with elevation of the sea bottom, causing the absence of 
these middle measures in this northern part of Scandinavia. Dr. Wiman 
appears to take this ground in his classification of the Cambrian-Sil- 
urian succession at page 24. 
These drift fragments have also yielded a series of fossils of Upper 
Cambrian type, figured on the third plate of fossils. Among the trilo- 
bites the three genera Acerocare, Shumardia and Ceratopiiyge are recog- 
nized. All these fossils are referred to the Ceratopyge region by Dr. 
Wiman, to which region he appends the Obolus sandstone as an under 
member. On Plate III are figured a number of examples of Obolus 
Apollonis which show the strong muscular markings that characterize 
that species. Two conodonts also are figured showing the presence of 
certain marine worms as low down as the Ceratopyge beds. 
This article is another contribution to the excellent palaeontological 
work done by Dr. Wiman. G. F. M. 
MONTHLY AUTHOR'S CATALOGUE 
OF AMERICAN GEOLOGICAL LITERATURE 
ARRANGED ALPHABETICALLY. 
ALDRICH. T. H. (and E. A. SMITH). 
The Grand Gulf Formation. (Science, Vol. IS, No. 444, pp. 20- 
26, July 3, 1903.) 
BARBOUR, E. H. 
Report of the State Geologist. (Geol. Sur. Neb., vol. 1, pp. 258, 
1303.) 
BEECHER, C. E. 
Observations on the Genus Romingeria. (Am. Jour. Sci., vol. 16, 
No. 91, pp. 12, July, 1903.) 
BELL, J. MACINTOSH. 
The Topography and Geology of Grpat Bear lake and thence to 
Great Slave lake. (Geol. Sur. Can., vol. 12, Rep. C, pp. 29, 1899.) 
BELL, ROBT. 
Summary Report of the Operations of the Geological Survey of 
Canada. (Geol. Sur. Can., vol. 12, Rep. A., pp. 223, 1S99.) 
BROADHEAD. G. C. 
The Bituminous and Asphalt Rocks of the United States. (Am. 
■Geol., vol. 32, No. 1, July, 1903.) 
BUSH. LUCV p. 
Note on the Dates of Publication of Certain Genera of Fossil 
Vertebrates. (Am. Jour. Sci.. vol. 16, No. 91, pp. 96-99, July, 1903.) 
