Mineralogy and Geology. 275 



1. Note mi the Cherokine of C, U. Skepard ; by T, Sterrt Hunt- 

 (From a letter to one of the editors, dated Quebec, June 23, 1857.)^ 

 The specimen of cherokine was in small imperfect milk-white prisms 

 forming a little layer on a fragment of a granular sulphuret of lead, cop- 

 per, etc, (I did not carefully note them). The whole amount is not more 

 than six or eight grains, so that I could not well determine its density. I 

 took about half of it and found it to consist of lead mth 2)hos2)hor?c acid, 

 besides^ traces, too small to be estimated, of a whitish precipitate by am- 

 monia in the filtrate from the PbS— it might be phosphate of lime, or 

 possibly alumina, but was probably not one per cent of the mineral, which 

 IS a. jmrepyromorphite, Damour, however, found in some pyromorphites 

 from Brittany variable amounts of hydrated alumina, up to sixteen per 

 cent, constituting a passage into plumbo-resinite. 1 have from him a 

 specimen of crystalline aluminous pyromorj^kite, which is associated with 

 ^ pure phosphate, and Shepard may have analyzed something of ther 

 kind, although my crystals of cherokine are pure phosphate of lead, 

 [j 8. Notice of the Occurrence of Aragonite near the Arkansas River; 



I by W. J. Taylor. — It will, be of interest to mineralogists to learn of the 



' occurrence of aragonite, sixteen miles from the crossing of the Arkansas 



f River on the north boundary of the Creek nation. It is found there in 



six-sided prisms with gypsum, imbedded in a ferruginous clay. The appear- 



\ 



I 



ance of the crystals, together with the associated minerals, renders it im- 

 J possible to distinguish some of the specimens of this locality, from some 



f of those from Molina and Valencia, in Aragon, Spain. Dr. S. W, Wood- 



house first brought specimens from this locality in 1850, and presented 

 them to the Academy of Natural Sciences of Philadelphia. I am in- 

 debted to him for a specimen and for the facts relating to its occurrence. 

 It is found in hills of considerable heights, which rise suddenly from the 

 level surface of the prairie. The crystals obtained have a diameter of 

 about three-eighths of an inch, but they were taken hastily from the cliflk 

 without the means or the time necessary for making good selections. 



9. Descriptions of Netv Species of Fossils from the Cretaceous Forma- 

 tions of Nebraska, with observations upon BacuUtes omtus and B. cotn^ 

 pressm, and the Progressive Development of the Septa in BacuUtes, Am- 

 monites and ScapUtes ; by James Hall and F. B. Meek. ^ Communi- 

 cated to the American Academy, June 27, 1844, and published in its 

 Transactions, volume v, p. 380, 1855.--This imj^ortant paper by Messrs. 

 HhU and Meek, written three years since, tliough printed later, by some 

 oversight has not been noticed in this Journal. The authors state in 

 the first paragraph that the collections were made by Messrs. F. B. 

 Meek and F. "V. Hayden, and we understand that the fecursion to 

 the Nebraska regions was projected by Professor Hall and carried out 

 at his axjs^n^a. The paper contains descriptions of one crustacean 

 and thirty-three new mollusoan fossil species of the Nebraskan Cretaceous 

 l>eds, and is illustrated by seven lithographic plates in 4to. It presents a 

 comparison of the fossils with those of New Jersey, and allude to the 

 distinction between them and those of Texas. As this sulyect and that 

 of the subdivisions of the beds are considered in detail in Professor HalFs 



* The specimen of cherokine in Professor Hunt's hands was sent him by Professor 

 Shepard, and the examination here mentioned was made at the request of J. D, 

 Dana.— Eds. 



