228 TWENTIETH KEPOET ON THE STATE CABINET. 



VIIT. — HISTORICAL NOTICE* OF THE GENUS GRAPTOLITHUS. 



Graptolithus. 

 Graptolites . 



Folia GRAMiNEUM Bromel. 



''Linna3us, Wahlenberg, Beck, Quenstedt, Mur- 

 chison, Portlock, De Verneiiil, Keyserling, 

 Mather, Vanuxem, Emmons, Barrande, D'Or- 

 bigny, Geinitz, Suess, Meneghini, M'Coy, 

 Richter, Salter, Nicol, Harkness, Hall, etc. 



Priodon Nilsson. 



Orthocebatites "Wahlenberg, Schlotheim, Quenstedt, Geinitz. 



LoMATocERAS Bi'onn, Eichwald. 



Prionotus Nilsson, Hisinger. 



FucoiDEs Brongniart, Eaton, Emmons, Conrad, Vanuxem. 



Petalolithus Suess. 



DiPRioN (subgenus) Barrande. 



DiDYMOGRAPTUs M^Coy, Salter, and others. 



DiPLOGRAPTUS M'Coy, Salter, Harkness, Hall, etc. 



MoNOPRioN (subgenus). Barrande. 



MONOGRAPTUS ■ 



^ , Geinitz, Emmons. 



Cladograptus 



Cladograptus Carruthers, non Geinitz. 



Glossograptus. 



, Emmons 

 Nemagraptus. 



Tetragraptus ) ^ , 



^ \ Salter. 



DiCHOGRAPTUS ) 



C YRTOGRAPTtJS Carruthers. 



Climacograptus . 



DiCRANOGRAPTUS , 



Phyllograptus . 

 Retiograptus.. . 

 Ccenograptus . . . 



J> Hall. 



A. D. 1727. The graptolites of Sweden were observed by Bromel, 

 who regarded them as leaves of grasses {Act. Upsal). 



1736. LiNN^us established the Genus Graptolithus in the first edition 

 of his Systema Naturce ; and some years later, in the twelfth edition, 

 introduced specific names, G. scalaris being the type of the genus. 

 This form has been regarded by Wahlenberg, Geinitz and Barrande 

 as the G. Sagittarius, compressed in a direction rectangular to the cellules. 

 The G. Sagittarius, Linn^us, is therefore regarded by the latter author 

 as the veritable historical prototype of the Genus Graptolithus and of the 

 family of graptolites. For my own part, I consider the G. scalaris, so far 

 as illustrations of that form have come under my observation, as a distinct 

 type of the graptolite family. 



1821. Wahlenberg considered the graptolites of Sweden as very 

 sleuder orthoceratites {Nova Acta. Soc. Scien. Upsal, Vol. viii, pp 92 

 and 93). 



1822. Schlotheim, participating in the opinion of Wahlenberg, 



* From the earliest notice of the Genus Graptolithus to the year 1850, I have added but 

 little to that which has already been published by M. Barrande in his Graptolites of 

 Bohemia. 



