266 REPORT ON THE STATE CABINET. 



species with two ranges of cellules ; and proposing the name Didymograp- 

 Tus for the bifurcating or two stiped forms with a single range of cellules. 

 Of fifteen species which he described, eleven are identified as those of 

 preceding authors, and three of these are recognized as American species 

 (^British Palceosoic Fossils, pp. 3-9, PL 3 B). 



1851. Dr. H. A. Prout described a graptolite, G. hallinus [= Dendro- 

 GBAPTUs], from the Potsdam sandstone of the St. Croix river {Am. Journal 

 Science [2], Vol. ix, p. 187). 



1851. Edward Suess published descriptions of Bohemian graptolites, 

 reproducing nearly all of those described by Barrande, recognizing several 

 other known species, and describing nine new species. He proposed the 

 name Petalolithus as a substitute for Diprion = Diplograptus (iVfflfer«y2S- 

 senschaftliche Ahhandlimgen, Vierter band, pp. 88-134, Plates vii, viii and ix). 



1851. J. W. Salter described G. tenuis, Portlock, and G. bullatus = 

 G. pristis ?, from the Silurian rocks of Scotland {Murchison, Silurian Rocks 

 of Scotland, Quar. Jour. Geol. Soc, Vol. vii, pp. 173 and 174). 



1851. Christian Boeck: Bemcei'lcinger angaaende G raptolitherne ; yvith 

 two lithographic plates {Ledsager Forslcernings-Catalogen for 1st Halvaar, 

 1851). CmiiSTiANiA, 1851. 



1851. ScHARENBERG, Ueber Graptolithen (cited by Geinitz; work not 

 seen by the writer). 



1852. Prof Geinitz described the graptolites of Saxony, placing them 

 among zoophytes, and proposing the genera Monograpsus and Clado- 

 GRAPSUS for certain forms of graptolites, and the genus Nereograpsus to 

 include Myrianites, Nereites, etc. He enumerates and describes fifty 

 species of graptolites of his own or of preceding authors ; and one species 

 of E/Etiolites, R. geinitsianus {Die Versteinerungen der Grauwachen-forma- 

 tien, Heft i, Die Graptolitlieii). 



1852. J. W. Salter described some graptolites from the south of 

 Scotland, recognizing three species Quar. Jour. Geol. Soc, Vol. viii, pp. 

 388-391, Plate xxi). 



1852. J. Hall reproduced the description of Graptolithus clintonensis , 

 and described G. venosus ~ Retiolites venosus. He also described the genus 

 DiCTYONEMA, Suggesting its relations with Graptolithus, and likewise the 

 genus Inocaulis {Palceontology of New York, Vol. ii, pp. 39 and 40, Plate 

 xvii, and pp. 174-176, Plates xl f and xl g). 



1853. J. W. Salter. A new species of graptolite {Didymograptus 

 caduceiis, Salter), "from the Lauzon Precipice, Hudson river group" 

 {Qiiarterly Jour. Geol. Soc., Vol. ix, p. 87). 



