158 PALAEONTOLOGY OF NEW YORK. 



In 1876 James Hall indicated and figured six new species of Tentaculites, 

 viz., T. arenosus, T. attenuatus, T. bellulus, T.scalariformis, T.sicula* and T. spiculus; 

 and also illustrated another form under the name T. fissurella (see page 173 of 

 this volume), a species previously described in 1843 {Illustrations of Devonian 

 Fossils, pi. 26, figs. 1-25). 



In the above historical notice, American authors only, or those treating of 

 American species of the genus since 1832, have been cited. During this 

 period our knowledge of this group of fossils has been greatly increased, chiefly 

 by the investigations and writings of European authors, the principal of whom 

 are the following: 



Hisinger in 1837 ;f Sir R. I. Murchison in 1839; M. de Verneuil in 1840 

 and in 1850 ; MM. d'Archiac and de Verneuil in 1842 ; Count Castelnau in 

 1843 (already cited); Dr. F. A. R<emer in 1843 and 1850 ; Mr. Austin in 1845; 

 M. de Verneuil and Count Keyserling in 1846 ; Prof. Geinitz in 1846 and 

 1856 ; M. Alcide d'Orbigny in 1850 ; Prof. Abich in 1850 ; Prof. McCoy, Prof. 

 Quenstedt and Prof. Geinitz in 1851; M. Barrande in 1852-1865 and 1867; 

 Drs. G. and Fr. Sandberger in 1850-56; Dr. Fr. Sandberger in 1852; Prof. 

 Geinitz in 1853; Dr. Steininger in 1853; Dr. Edward Gueranger in 1853; 

 Prof. Morris in 1854; Dr. R. Richter in 1854, 1856, 1865, 1866 and 1867; M. 

 Ed. de Verneuil in 1855; Dr. Boll, in 1856, 1859 and 1867; Dr. Ferd. Roemer 

 in 1857, 1862 and 1865; Chevalier Eichwald in 1857 and 1860; Prof. Giebel 

 in 1858; Dr. Fr. Schmidt in 1858 and 1859; Messrs. Salter and Morris in 

 1859; Prof. Rudolf Ludwig in 1864; Prof. Kjerulf in 1865.J 



In 1867, M. Barrande, in, his " Systeme Silurien du Centre de la Boheme, Tome 

 III," has given a most complete resume of all that has been written in Europe 

 and America concerning this group of fossils ; including also the genus Styliola 

 of Leseuer. He has likewise presented, in a most complete and satisfactory 

 manner, the geological and geographical distribution of these genera in the 



* 8ee pages 159 anil 165 of this volume. 



t This author cites Katok, as 7-eferring- the Tk.ntacclitbs to spines of Echini's, "Aculii Echini g-yracantae," 

 and the species citeil by him from near Schoharie, N. Y., is evidently the T. gyracanthns. 

 \ The works of some of these authors are not accessible to the writer, and they are cited upon the testimony 



Of M. I'.UMIIM'K. 



