86 Reviews—The Tremadocian of Sweden. 
As stated in the preface, it would seem that the work for the memoir 
was begun by the author whose name appears second, and submitted as 
a degree thesis to the Lund University as long ago as 1895. Much of 
the material then collected was, however, quite new, and as its deter- 
mination demanded more time than its collector could afford, it was in 
1900 allowed to pass by purchase to the collections of the University 
Museum. Coming then under the direct notice of Professor Moberg 
the material has later been further worked up by him, to whom the 
arrangement of the present paper is doubtless due. The memoir is 
preceded by an author’s bibliography, which, except for the strange 
omission of such names as Sedgwick, Ramsay, Salter, and other founders: 
of our British Tremadoc Series, seems to be quite complete. The 
memoir is divided into five sections, which we may consider in order. 
Part I is an abstract of the papers mentioned in the bibliography, 
which are quoted as a history of paleontological discovery among the 
Ceratopyge-bearing beds of Scandinavia and the European continent 
generally, and discusses at some length the various stages in the 
evolution of the modern view as to their classification’ and strati- 
graphical position. The argument is exceedingly clear, and if a little 
one-sided is only an advocate’s way of stating a strong case. A similar 
treatment of the history of the shales with Dictyograptus and the 
contemporaneous sandstones and conglomerates with Obolus follows, 
and this with a review of the recent paleontological achievements 
among Tremadoc rocks of Britain and America concludes the first part 
of the memoir. ; 
Part II is devoted to a consideration of the possibility of a further 
subdivision within the Ceratopyge regio of various parts of Sweden. 
In the opening section the Ceratopyge regio is defined as being the 
contemporaneous equivalent of the beds 2e and 3a of Brogger’s 
Kristiania classification. The fegio is therefore directly underlain 
by the well-recognized zone of Peltura scarabeoides, and is overlain by 
the equally characteristic zone 2 of Tornquist’s Lower Didymograptus 
shales (zone of Didymograptus balticus). ‘Three very distinct facies of 
sedimentation are recognized, and the corresponding paleontological 
table of equivalents is set out as follows :— 
-Tritonitic Facres. Graprozitic Factrs. BracHIOPOD-BEARING 
Facts. 
Zone of Apatocephalus Zone with Tetragrap- Not yet studied. 
serratus, or Cerato- tus phyllograptoides 
Upper J pygekalk. oe 1 of erat ® 
Dison. Ve ' idymograptus shales}. 
The Shwmardia zone, Zone of Clonograptus Not separated from 
} or Ceratopygeskiffer. heres (Wgd.), MSS., lower zone; contains 
ue .Sp. Obolus Apollinis. 
Zone of Symphesurus 
inerpiens, not recog- 
nized in Sweden. 
Zone of Bryograptus 
is Ajerulfi, along with 
stones Clonograptus tenellus 
Pats and var. 
Zone of Hysterolenus Zone of Dictyograptus Zone with O. Apollinis 
Tornquisti, Habelliformis. (Obolus conglomerate 
' “Boeckia Mobergi, and sandstone). 
and Acerocare sp. 
