124 
The American Geologist. 
August, 1892 
The foregoing facts and considerations have led Mr. Smyth to the con- 
clusion that the oolitic ores at Clinton are not of secondary origin but 
were deposited as hydrated peroxide of iron in intimate connection with 
cotemporary deposition of amorphous and chalcedonic silica. 
'■'■The Ortlioceratidoi of the Trenton Limestone of the Winnipeg Basin." 
By J. F. Whiteaves. (Transactions of the Royal Society of Canada, 
Vol. IX, Section 4, pp. 77-90. Plates v-xi, both inclusive. 1891 — dis- 
tributed in 1892.) 
This is one of the most important contributions to the history of the 
Cephalopoda of the Ordovician rocks which has appeared for a long 
time. The paper consists, as the author indicates, '^of a critical and sys- 
tematic list of the Orthoceratidce at present in the Museum of the Geo- 
logical Survey of Canada from the formation and region indicated in its 
title, with descriptions of such species as appear to be new." In it Mr. 
Whiteaves considers the genera Actinoceras and Sactoeeras as distinct 
from Orthoeeras and Poterioceras from Gom-phoceras. 
The following table shows at a glance the species, author and refer- 
ences of each form in the paper in question. 
Species. 
Author. 
Reference. 
1. 
Endoceras annulatum, var. 
Hall. 
Plate V, flgs. 1 and la, p. 77. 
" " '' dand 2a, p. 78. - 
2. 
" subannulatum, 
Whitfield. 
3. 
" crassisiphonatum, 
N. Sp. 
" VI, flgs. 1-4, PI. VII, fig. 1, p. 79. 
4. 
Orthoeeras simpsoni, 
Billings. 
" vii,flgs. 2,2a & 3, Pl.viii,fig. 1, p.80. 
5. 
semiplanatum. 
N. Sp. 
" VIII, flgs. 3 & 3a, p. 81. 
6. 
" selkirkeiise, 
ISI. Sp. 
" VIII, flgs. 2, 2a, 2b, p. 82. 
7 
" winnipegense, 
Actinoceras richarosoni, 
N. Sp. 
" VIII, figs. 4, 4a, 4b, p. 82. 
8. 
Stolves. 
" IX, figs. 1, 2 and 3a, p. 83. 
9. 
" bigsbyi, 
" alluiuetteiise, 
Bronu. 
" x, fig. 2, p. 84. 
10. 
Billings. 
" X, figs. 3, 3a, p. 85. 
11. 
Sactoeeras canadense, 
N. Sp. 
" X, figs, la-c, p. 85. 
12. 
Gonioceras lambli, 
N. Sp. 
" XI, figs, lab, p. 86. 
13. 
Poterioceras nobile, 
Whiteaves. 
Not figured, p. 87. 
14. 
" apertuin, 
Whiteaves. 
" XI, figs. 2 and 3, p. 87. 
15. 
" gracile, 
N. Sp. 
'• XI, figs. 4 and 4a, p. 87. 
The specimens from which the above species are enumerated were 
collected for the most part by officers of the Geological Survey of Can- 
ada during their explorations and surveys in Manitoba and Keewatin: 
Messrs. Dr. Bell, Dr. Selwyn, Weston, Tyrrell, Dowling, Lambe, and also 
by Messrs. Donald, Giinn and McCharles from the same district. They 
form a valuable addition to the National Museum of Canada at Ottawa. 
The Geological and Natural History Survey of Minnesota, Nineteenth ((n- 
nual report, for 1890. N. H. Winciiell, State Geologist. 255 pages; 
with two plates, and 36 figures in the text. The first part of this report 
contains a translation of the treatise by Dr. Emanuel Boricky, 'The Ele- 
ments of a new Method of Chemico microscopic Analysis of Rocks and 
Minerals," 77 pages, with 40 figures of thin sections arranged on two 
plates. This work will be used in the study of the crystalline rocks of 
Minnesota, and will be welcomed by many petrographic students. 
Another translation presents a paper by the German geologist. Dr. J. H. 
Kloos, who made extensive observations in Minnesota before the begin- 
aaing of the present survey. 
