316 Reviews—W. OC. Brogger—On the Silurian of Sweden. 
thickness, lithological characters, and lists of included fossils. The 
next section, of over 100 pages, is devoted to a description of the 
fossils. The Graptolites are for the most part merely mentioned,—the 
author leaving the description of these forms to Dr. Holm, of Upsala, 
who is at work upon them,—he however inserts some important 
observations upon Dictyograptus. (Dictyonema) flabelliformis, Kichw.., 
and Bryograptus. The former is described and figured as a free 
form, possessing a sicula, and is thus shown to resemble the other 
Graptolites. The Echinodermata and Mollusca are next described, 
but the larger part of this section of the work is occupied by 
a description of the Trilobites, of which several new forms are 
described and admirably figured. 
The third section gives a comparison of the stages 1—3 with their 
foreign equivalents; and here we find much that is new. The 
following correlations with the beds of England and Wales are 
adopted by Professor Brogger :— 
Stage 1 eis = Menevian Series. 
pe aD ie z = Maentwrog. 
pee SE ete = Lower Dolgelly. 
ES = Upper Dolgelly. 
26 \ esc Shales 
>) ece eon eo eee eee ese eee ecco eoe (of Malvern, etc.) 
5, 98aa (beds with Symphysurus incipiens and) _{ Shineton Shales 
3a 8 Ceratopyge Shales) SEL. a =| (approximately). 
»,  8ay (Ceratopyge Limestone)... ... ... .. = Part of Tremadoc. 
», 380 (Phyllograptus Shales) ... = Skiddaw Slates, etc. 
The author, in making these correlations, pays great attention to 
identical or closely allied forms occurring in different countries, and 
whilst tacitly assuming the value of paleontological resemblances in 
comparing widely separated deposits, gives additional weight to ‘it. 
Especially interesting is the very full account of the relationships 
of the Ceratopyge beds, and Professor Brogger’s analysis of the fauna 
of the Shineton Shales of Shropshire. This, as he points out in the 
appendix, was made before he knew of the existence of Linnarsson’s 
notice in the GnoroeicaL Magazine of April, 1878, and although 
he differs from Linnarsson in some points, their more important 
conclusions are the same. The following are some of his conclu- 
sions :—Conocoryphe monile is an Euloma, perhaps identical with 
E. ornatum; Olenus triarthrus perhaps belongs to his sub-genus 
Parabolinella ; Conophrys salopiensis is identical with or nearly re- 
lated to C. pusilla; Agnostus duz may be compared with the closely 
allied A. Sidenbladhi; Asaphellus Homfrayi may be most nearly 
allied to Niobe, and Platypeltis Croftii to Symphysurus ineiptens ; 
Lichapyge cuspidata seems very closely related to Lichas parvulus, 
Barr., from Hof; Obolella sabring belongs to the same group with 
O. sagitialis, and Lingulella Nicholsoni is allied to the group of L. 
lepis. From this analysis the author considers that it almost un- 
doubtedly follows that the Shineton Shales correspond with a horizon 
between the Dictyograptus-schiefer 2e, and the Ceratopygekalk 8a x, 
i.€. approximately to the deposits 3a aand 3a 8. The latter, the 
Ceratopyge-schiefer, which certainly are above the Dictyograptus 
