264 REPORT ON THE STATE CABINET. 



1842. Vanuxem identified a graptolite of the Utica slate with the 

 Fucoides dentatiis of Brongniart. Graj^tolitJms dentatus, Vanuxem; G. 

 pristis, Hall, Hisinger'? {Geol. Rep. M Dist., N. Y., p. 57, fig. 2). 



1843. Gen. Portlock, in his Geological Report, discussed the nature 

 of the graptolites, recognizing them as true zoophytes, and indicating 

 their analogy with Sertidaria and Plumularia. He suggested that the 

 species may form several genera, belonging perhaps to different orders. 

 The species described and enumerated by this author are indicated under 

 the names G. sedgivicki, G. distans, G. tenuis, Portlock ; G. convolutus, G. 

 Sagittarius, G. pristis and Q. folium, Hisinger ; G. scalaris, Linn^us, 

 G. foliaceus, Lonsdale (^Geol. Rep. on Londonderry, Tyrone and Fermanagh, 

 pp. 317-321, Plates xix and xx). The species described by this author 

 as Gorgonia, probably belong to Dictyonema. 



1843. W. W. Mather and E. Emmons recognized Graptolites dentatus 

 as characterizing the Utica slate {Geol. Rep. 1st Dist. N. Y., p. 390, and 

 Geol. 2t/ Dist. N. Y., p. 279). 



1843. J. Hall described Graptolithus clintonensis from the shales of 

 the Clinton group in the Upper Silurian formation {^Geol. Rep. Ath Dist. 

 N. Y, p. 72, fig. 12). 



1845. Sir R. I. Murchison, De Verneuil, and Count Keyserling 

 enumerated G. Sagittarius, Hisinger, and G. disticlius, Eichwald, as char- 

 acterizing the Silurian formation of Russia {Geol. of Russia and the Ural 

 Mts., Vol. ii, p. 382). 



1846. Prof Geinitz repeats the opinion expressed by himself in 1842, 

 regarding the nature of the graptolites ; and divides them into two sec- 

 tions, the straight and the spiral forms. In the first section he describes 

 four species : 1. G. foliaceus, Murchison (with which he identifies G. 

 pristis and G. folium, Hisinger, and G. dentatus, Vanuxem); 2. G. priodon, 

 Bronn (under which he includes G. ludensis, Murchison, and G. teretiuscu- 

 lus, Hisinger) ; 3. G. Sagittarius and G. scalaris, Linn^us (which he regards 

 as varieties of the same species), Fucoides serra, Brongniart, and G. 

 murchisoni, Beck; 4. G. serratus, Schlotheim {^Grundriss der Versteinerungen, 

 p. 310, Plate x). 



1846. E. Emmons published Fucoides simplex [= Graptolithus secalinus^, 

 from the roofing-slates of Hoosic {Natural History of New York, Agriculture, 

 Vol. i, Plate xvii, fig. 1). 



1847. J. Hall described and figured fifteen species of graptolites, 

 mostly new, from the Lower Silurian strata, placing them among zoophytes 

 {Pal. N. York, Vol. i, p. 265, Plates Ixxiii and Ixxiv). 



