232 TWENTIETH REPORT ON THE STATE CABINET. 



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

 among zoophytes, and proposing the genera Monograpsus and Cladograpsus 

 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 

 Retiolites, R. geinitzianus {Die Verstei7ierungen der Grauwackeii-jorma- 

 tien, Heft i, Die Graptolithen). 



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

 land, recognizing three species [Quart. Jour. Geol. Soc, Yol.viii, pp. 388- 

 891, pi. xxi). 



1852. J. Hall reproduced the Graptolithus clintonensis, and described 

 G. venosus = Retiolites ve?iosus. He also described the genus Dictyonema, 

 suggesting its relations with Graptolithus, and likewise the genus hiocaulis 

 [PaloRontology of New-York^ Vol. ii, pp. 39 and 40, pi. xvii, and pp. 174- 

 176, plates xl f and xl g). 



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

 caduceus, Salter), "from the Lauzon Precipice, Hudson-river group" 

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



1855. Dr. Emmons described several new species of graptolites, and 

 proposed the generic names of Nemagrapsus, Glossograpsus, and Stauro- 

 grapsus {American Geology, Vol. 1). 



1857. Prof. Meneghini, from collections made by General De la 

 Marmora, described ten species of graptolites from the Silurian rocks of 

 the Island of Sardinia, of which eight species were new {Palcsontologie de 

 rile de Sardaigne). 



1857. J. Hall communicated to Sir William E. Logan descriptions 

 of twenty-one new species of graptolites from the Lower Silurian rocks of 

 Point Levis (Lauzon seigniory) near Quebec, (many of the species having 

 compound forms not before known among this family of fossils), and pro- 

 posed several new genera {Report of Progress, Geol. Survey of Canada, 

 1857. See also the Canadian Naturalist and Geologist, Vol. iii). 



1858. William Carruthers gave a list of twenty-four species of 

 graptolites found in the shales of Dumfriesshire, and described the G-enus 

 Cladograptus ; C. li^iearis, Diplograpsus tricornis and Didymograptus 

 moffate?is2s {Annals ^ Magazine of Natural History, Vol. iii,* 1859). 



1859. J. Hall published Notes upon the Genus Graptolithus, with an 

 enumeration of the Canadian species ; a notice of graptolite-stipes with 

 reproductive cells, together with descriptions of two new species {Twelfth 

 Report on the State Cabinet, Albany, pp. 45 and 58, 1859). 



1859. The preceding notes were reproduced, with descriptions of five 

 additional species of Graptolithus, one Retiograptus, the genus Thamno- 

 graptus with two species, and one species of Rast rites {Palceontology 

 N. Y., Vol. iii, supp. pp. 495 and 522). 



* It is with much regret that I am compelled to say that at the time of preparing tho 

 Canadian Decade this volume was not within my reach, nor did I know of the publication 

 of JMr. Carruthers' paper, which otherwise I should have cited with pleasure. 



