206 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
The question suggests itself as to whether the Kegel may not be of 
the same age as the Wesenberg, instead of being older as has been 
supposed. On the basis of the faunas this must be at once answered 
in the negative, for there are only one or two of the long ranging 
species which are common to the Jewe and Wesenberg, while there 
are quite a number of species, particularly trilobites and brachiopods, 
common to the Jewe and Kegel. 
The presence of a few of the Wesenberg trilobites at localities south 
of the outcrop of the Wassalem suggests that there may be a thin edge 
of the Wesenberg in that region, probably overlying the strata with 
the Cyclocrinites, but I did not have time to search for outcrops which 
might have shown such relations. It seems more probable, however, 
that these trilobites are not restricted to the Wesenberg horizon, 
but are found in the Kegel as well. 
It seems very possible therefore, that the Lyckholm rests at the 
west on the Kegel and further east upon the Wesenberg, and there is 
undoubtedly an unconformity at the base of the Lyckholm, for there 
is at most, only a very small fraction of the normal thickness of the 
Wesenberg present south of Wassalem. The relations of the forma- 
tions may be as represented on Plate 8. 
THE LOWER AND MIDDLE ORDOVICIAN OF SWEDEN. 
To make a direct correlation between the various subdivisions of 
the Ordovician in Russia and North America is impossible, the testi- 
mony of the few species common to the two areas being entirely out- 
weighed by the general unlikeness of the faunas. It was a realization 
of this fact which caused a visit to Sweden and Norway after studying 
the Russian sections. I visited the rather complete and easily ac- 
cessible section at Kinnekulle, and other sections in Vasterg6tland at 
Hunneberg, Ekedalen, and Alleberg near Falképing. In Ostergét- 
land I collected at the large quarries at Borghamm and at the old 
quarry at Vistani, the Husbyfjol of the literature on trilobites, and 
visited a number of very poor localities in the vicinity of Motala. In 
Scania I had the very kind guidance and assistance of Professor Dr. 
J. C. Moberg, without whose help it would have been impossible for 
me to have understood the very imperfectly exposed sections on the 
Fagelsing and at Jerrestad. I was not able to visit Oeland on account 
