228 Reviews — Limdpr^n^s Cfet^ceous Bmohiopoda. 



and bones of the Dinocerata in tlie Geological Department of the 

 British Museum (Natural History), so that we can now form from 

 their study a very fair idea of these huge Eocene herbivores once so 

 abundant in Central North America. 



II. — Undersokningak ofvek Brachiopoderna I SvERGES Krit- 

 SYSTEM AF Bernhard Lundgrkn. Med 3 Taflor i Ljustryck. 

 (Ur Lunds Universitets Arsskrift. t. xx.) 



Descriptions of the Brachiopoda in the Crbtaceotts Eooks 

 . OF Sweden. By Bernhard Lundgren. With Three Photographed 

 . Plates. From Lund University Year Book, vol. xx. pp. 72.- 

 (Lund, 1885.) 



AS an introduction to this valuable monograph. Prof. Lundgren 

 has given a short description of the characters of the Cretaceous 

 rocks of Sweden, which is not without interest to those who study 

 the group in this country. The Swedish Cretaceous strata, as is 

 well known, cover an extensive area in the Province of Skane, at 

 the south of the peninsula. They have been investigated at various 

 times by such authorities as Angelin, Hebert, Schliiter and others, 

 but owing in part to the thick coating of glacial drift which conceals 

 the underlying Chalk from observation, and in part to the very 

 different aspect which strata of the same geological horizon exhibit 

 in different localities, the relative position of the different beds has 

 not been definitely settled. 



According to Prof. Lundgren, the Cretaceous strata of Sweden 

 have peculiar petrographic and palseontological characteristics in 

 each of the three different districts of Kristianstad, Ystad and 

 Malmo. That of Kristianstad, to the north-east of the province, 

 principally consists of Griislmlk (that is, of a limestone composed 

 of grains resulting from the breaking up of the shells and tests of 

 molluscs and echinoderms) with in places a mixture of quartz-sand- 

 grains and even occasionally boulders of metamorphic rocks, so that 

 the Gruskalk passes sometimes into a pure sandstone, or even a coarse 

 conglomerate. Flints are not abundant ; they occur either in thin 

 beds or nodules, and they are always of a speckled white, and never 

 black or greenish-black as in the chalk of the Malmo district. In 

 places the gneissoid rocks, which formed the sea-bed on which the 

 Gruskalk was deposited, are exposed with their surfaces covered 

 with naturally-attached Polyzoa, Spondylus, etc. The Kristianstad 

 deposit is clearly of a shallow-water character. Two pala3onto- 

 logical divisions can be recognized in it ; a lower characterized by 

 Actinocamax subventricosus, and a higher by Belemnitella mucronata. 

 The lower division has only been recognized elsewhere out of 

 Sweden in East Prussia, and it is thought partially to correspond to 

 the German Quadraten-Kreide. 



The Ystad district on the extreme south is now separated from 

 that just referred to by a broad gneissoid ridge, which probably 

 existed in Cretaceous times ; the boundaries between it and the 

 Malmo district have not been ascertained. The prevailing rocks 



