Geology and Mineralogy. 227 
whole thickness of the productive Coal-measures. Its companion 
ulmonate, Conulus priscus, has as yet been found only in the 
owest of the beds above referre 
e were so fortunate as to discover, on the same expedition, 
another large Sigillaria stump, stored with reptilian bones; which 
y afford some interesting additions to the land 
fauna of the Coal period. J. W. DAWSON. 
15. Brachiopods of the Swedish Parudoxides beds of Sweden.— 
- M. Linnarsson enumerates and describes the following Swedish 
Brachiopods (Swedish Acad. Sci., May 12, 1875): Orthis Lind- 
strimi Linnarsson, O. exporrecta Linn., O. Hicksi Salt., Lingu- 
lella(?) Nathorsti, Obolus ——? Acrotreta socialis v. Seebach, 
Obolella sagittalis Salt., Acrothele (un. g.) coriacea Linn., A. 
ulata, Kutorgina cingulata Bill. var. pusilla, Iphidea ornatella 
Paradoxides and lower beds of Great Britain have thus 
far afforded only Lingulella ferruginea Salt., L. primcva Hicks, 
Discina pileolus Hicks, Oboleila sagittalis Salt., O. maculata Hicks, 
Orthis Hicksi Salt., with perhaps Kutorgina cingulata Bill. 
Including all known species, the number of species is small com- 
ared with that of the trilobites, the ratio being 29 to 150 of the 
atter. In general the Paradoxides beds are characterized by 
the most of their Brachiopoda having a corneous shell. The ge- 
heric types Kutorgina, Acrothele and [phidea have not been found 
in later beds, 
16. Geological Survey of Brazil.—A recent letter to Prof. T. 
B. Comstock from Prof. C: F. Hartt, head of the Geological Sur- 
vey of Brazil, states that he is preparing to send one division of 
‘8 corps, probably under the direction of Mr. O. A. Derby, to 
make a careful examination of the Amazonian Country, and to con- 
hect the explorations of this region with those now in progress to 
the southward, in the interior of Brazil, and along the coast 
Chap eport on the Chemical, Mineralogical and Microscopical 
R racters of the Lavas of Vesuvius, from 1631 to 1868; by 
ev. Samu Havenron, of Trinity College, Dublin, and Eowarp 
nha Director of the Geological Survey of Ireland. 164 pp. 4to. 
I 16... Art, of vol. xxvi, of Trans. R. Irish Acad.,. Dublin.— 
0 this elaborate memoir the chemical and mineralogical part 1s 
a ” Haughton, aided in the chemical analyses by Mr. Wm. 
tly, and the microscopical, by Mr. Hull. The minerals found 
Portions of these mineral constituents, Dr. Haughton, by a simple 
