TRANSLATIONS AND NOTICES 



GEOLOGICAL MEMOIRS. 



On Graptolites. By Prof. Dr. H. B. Geinitz. 



[Zeitschrift der Deutschen Geolog. Gesellsch. vol. iii. p. 388-390.] 



In a brief notice of his work on Graptolites *, Dr. Geinitz gives the 

 results arrived at after a critical examination of all the species of 

 Graptolites published up to the end of 1851. 



The number of real species Dr. Geinitz limits to 60. The following 

 is a synopsis of the genera, with observations. 



Family Graptolithin^, Bronn. 



Genus 1. Diplograpsus, M'Coy. 



Syn. — Biprion, Barrande ; Petalolithus, Suess. 

 Characters. — Biserial, with a solid axis. 

 Number of species, 1 7- 



Genus 2. Nereograpsus, Geinitz. 



Syn. — NereiteSy Myrianites, Nemertites, &c., Auctorum. 



Characters. — Biserial. The stem having no central axis, or a very 

 soft one. 



Number of species, about 7. Type. Nereites Cambrensisy Mur- 

 chison. 



Note. — In specimens from Saalfeld I saw the cell-mouths distinctly. 



Genus 3. Cladograpsus, Geinitz. 



Characters. — With two branches, or forked. 

 Number of species, 7. Types. Graptolithus Murchisoni, Beck, 

 and Graptolithus ramosus. Hall. 



Genus 4. Monograpsus, Geinitz. 



Syn. — Monoprion and Rastrites, Barrande ; GraptolithuSy Suess. 

 Number of species, 28. 



* ' Die Versteinerungen der Grauwackenformation in Sachseu und den angren- 

 zenden Landen-abtheilung. Heft 1. Die Graptolithen. 58 pp. 6 Lith-PIates. 

 4to. Leipsic, 1852.' 



VOL. VIII. PART II. E 



