STUDY OF THE GRAPTOLITES. 263 



1822. ScHLOTHEiM, participating in the opinion of Wahlenberg, 

 described and figured a species under the name OrtJioceratites sen-atiis 

 {PetrefaMenkunde, p. 56, Plate viii, fig. 3). 



1828. Ad. Brongniart described two species of graptolites from the 

 Transition formation at " Pointe Levi pres Quebec dans le Canada," as 

 Fucoides dmtatus and F. serra* {Tlistoire des Vegetaux Fossiles, pp. 70 and 

 71, Plate vi, figs. 7-12). 



1829 [1831?]. F. HoLL re-published the description of OrtJioceratites 

 serratus of Schlotheim {Handbucli die Petrefad., Vol. ii, p. 234). 



18 — 7 Prof NiLSSON recognized the graptolites as polyps belongnig 

 to the ceratophydians. He proposed to substitute the preoccupied name 

 of Priodon for that of Graptolithus (See Dr. Beck, in Murchison!s Silu- 

 rian System, p. 696.) 



1835. Prof Bronn, adopting the opinion of Prof Nilsson regarding 

 the nature of graptolites, gave the name Loniatoceras {Lethea Geognostica, 

 Vol. i, p. 55, Plate i, fig. 13, L. priodon), at the same time arranging the 

 species with the orthoceratites, etc. 



1837. HisiNGER described five species of graptolites from the rocks 

 of Sweden, adopting the generic name Prionotus, proposed by Prof. 

 NiLSSON. Among these are two species of Linn^us, P. Sagittarius and 

 P. scalaris; to which he added the new species P. pristis, P. folium and 

 P. convolutus {Letli. Suecica, p. 113, Plate 85.) In the second supplement 

 to that work, published in 1840, two other species are added, under the 

 names P. geminus and P. teretiiiscidus ; the latter being of the type of G. 

 scalaris (Supp. ii, p. 5, Plate 38). 



1839. Sir Roderick Murchison described and figured in the Silurian 

 System three species of graptolites, G. ludensis, G. murchisoni, and G. 

 foliaceus {Sil. System, p. 695). 



1840. Prof. EiCHWALD published a description of Lomatoceras distichus, 

 a graptolite from the Silurian formation of Esthonia {^Sil. Syst. in Esth- 

 land, p. 101). 



1840. Prof QuENSTEDT sought to reestablish the opinion that the 

 graptolites are true orthoceratites {N. Jakrh.f. Min., p. 275). 



1842. Prof Geinitz described and figured five species of graptolites 

 under the names G. foliaceus, Murchison, G. priodon, Bronn, G. ludensis, Mur- 

 chison, G. serratus, Schlotheim, G. scalaris, Linn^us, and G. spiralis, Geinitz ; 

 regarding them as belonging to the Cephalopoda (iV. Jahrb.f. Min., p. 697). 



* These species are probably identical with those which I have heretofore described as G. pris- 

 tiniformis and G. bryonoides . 



