PUBLICATIONS RECEIVED. 551 
PUBLICATIONS RECEIVED. 
Government Map of Canada, from [ed River tothe Gulf of St. Lawrence, 
compiled by Toomas Devine, P. L. 8., Head of Surveys, Upper Canada Branch, 
This is, without exception, the most useful map of the Province that has yet 
appeared. It is on a scale of thirty miles to the inch ; and in addition to the 
ordinary topographical matter, it conveys much valuable information in the 
shape of lists of townships, distances, &c. All the new roads and townships are 
laid down; and the engraving and getting up of the map leave nothing to be 
desired. 
Contributions to the Paleontology of Jowa, by James Hatt. This publication 
is in the form of a supplement to the author’s Report on the Geology of Iowa. Tt 
contains descriptions and figures of various new crinoids from the Carboniferous 
formations of the West. The described species belong in great part to the genus 
Actinocrinus; but new forms of Poteriocrinus, Forbesiocrinus, dc., are also 
announced. A new genus is likewise ‘instituted under the name of 7rematocrinus. 
This belongs to the family of the CyarHocrinipz, and is more or less closely 
related to both the Rhodocrinus of Miller, and the Acanthocrinus of Roemer. 
Probably, however, these allied genera, with some other near-lying forms, may 
eventually be united, by an extension of the type-characters of the older genus, 
The following is the generic formula of Trematocrinus, as given by Professor 
Hall :—Basal plates, 5 ; sub-radial plates, 5; Radial plates, 3x5; Supra-radials, 
or Radials of the second order, 8 (or 4)*10. Anal plates, 12 to 17 or more. 
Inter-radials, 12 to15 or more. Arms, five, bifurcating. Pores or ambulacral 
openings, 10. J.C, 
