352 EIGHTEENTH REPORT ON THE STATE CABINET. 



NOTICE. 



The determination of the relations of the Leclaire, Racine and Chicago 

 limestones to the Niagara group, as well as the comparison and determina- 

 tion of the greater part of the species described in the preceding pages, 

 together with others not here included, were made between 1861 and 1863, 

 anticipating their publication in the second volume of the Geology of 

 AVisconsin. Up to the present time, no legislative action has been taken to 

 secure the printing of that volume, and I have therefore thought it desi- 

 rable to publish the results of these investigations in the present form. 



Many of the species have been derived from a private collection made 

 at Racine and vicinity by Mr. T. J. Hale, and were obtained from him. 

 Several interesting specimens, duly credited, were given to me by Dr. H. 

 Day of Wauwatosa, and some others were sent to me some years since by 

 I. A. Lapham, Esq., of Milwaukie. A few specimens from Illinois were 

 obtained from Prof. C. U. Shepard. 



The continuation of the observation on the Cephalopoda, and those 

 upon the Brachiopoda. etc., will appear in the Eighteenth Report upon 

 the State Cabinet in the regular order of its publication 

 January, 1865. 



The printing of this paper was suspended at this point in January 1865, 

 in the expectation of resuming it within a few weeks ; but it was not reached 

 in the printing of the Report for that year, and was again continued in the 

 list of papers for the Nineteenth Report, but still was not reached in the 

 course of printing, and now appears in the Twentieth Report. In the mean 

 time, it has seemed to me desirable to procure illustrations of some of the 

 species described, and the accompanying plates contain figures of the 

 greater part of them. A few others, which I have deemed it important to 

 illustrate, may appear in a subsequent Report. 



48 



