28 TJie Paleontologist. [July lo, 1879. 



It may be mentioned as a fact that there are about 500, perhaps over 500 

 described species of fossils found in the Cincinnati Group, within a radius of 

 50 miles of Cincinnati, of which only about 100 species are recognized as iden- 

 tical with species found in the three New York Groups, (about 65 of the 100 

 are confined to the Trenton, 18 to the Utica Slate and Hudson River, the re- 

 mainder of the 100 in common to the three groups), thus leaving 400 or more 

 species found in the Cincinnati Group that are unknown in the New York Groups. 



The evidence aU points to the wisdom in establishing the name Cincinnati 

 Group, and the importance of retaining it. 



It seems reasonable to suppose that eminent Geologists and Paleontologists 

 of the high standing of Professors F. B. Meek, and A. H. Worthen knew what 

 they were doing in proposing the name, and had the best of evidence and 

 soundest reasons in its favor. 



Since the above article was in type, we have received from the author a 

 Treatise on The Utica Slate and Related Formations, c^^v.* The subject is quite 

 elaborately discussed, but we do not find anything in it to change our views. 

 It is stated that the Utica Slate beds in New York and other eastern localites, 

 are noted for the large number of Graptolites, and are described as '■'■Black Bi- 

 tuminous Slates." At Cincinnati, the beds referred to are noted for the 7'arity 

 of Graptolites, and the " Shales" have none of the Black Bituminous character, 

 and ?nost of the many fossil forms are different. 



*" The Utica Slate and Related Formations. — FossiLs of the Utica Slate and Metamor- 

 phoses of Triarthrus Becki. By C. D. Walcott." 8 vo. pp. 38, with two plates. The two 

 plates, with 38 figures of fossils, are finely executed. The 16 figures of Triarthrus becki, 

 illustrating the author's views, are of special interest, showing that species at different 

 stages of growth, from the young of less ithan a line in length to a fully developed indi- 

 vidual of over two incites in length. 



