GRAPTOLITES. 63 
wissenschaftliche Abhandlungen, vierter Band, pp. 88-134, pls. vi, 
vill, 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, Quart. Jour. Geol. Soc., vol. vil, pp. 173 and 174.) 
1851. Boeck; Bemarkinger Angaaende Graptolithen Christiania (cited 
by Geinitz; the work not seen by the writer). 
1851. Scharenberg, iéiber 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 Cladograpsus 
for certain forms of graptolites, and the genus Mereograpsus to include 
Myrianites, Nerettes, ete. He enumerates and describes fifty species of 
graptolites of his own, or of preceding authors; and one species of 
Retiolites, R. Geinitzianus. (Die Versteinerungen der Grauwacken-forma- 
tion, heft 1, Die Graptolithen.) 
1852. J.W. Salter described some graptolites from the south of Scotland, 
recognizing three species. (Quar. Jour. Geol. Soc., vol. vill, pp. 388- 
391, pl. xxi.) 
1852. J. Hall reproduced the Graptolithus Clintonensis, and described 
G. venosus, = Retiolites venosus. He also described the genus Dictyo- 
nema, suggesting its relations with Graptolithus, and likewise the genus 
Inocaulis. (Paleontology of New-York, vol. ii, pp. 89 and 40, pl. xvii, 
and pp. 174-176, plates xl F, and xl @.) 
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 Wemagrapsus, Glossograpsus, and Stauro- 
grapsus. (American Geology, vol. i.) 
1857. Prof. Meneghini, from collections made by General De la Mar- 
mora, described ten species of graptolites from the Silurian rocks of the 
Island of Sardinia, of which eight species were new. (Palcontologie de 
PLle de Sardaigne.) 
1857. J. Hall communicated to Sir William EH. Logan descriptions of 
twenty-one new species of graptolites from the Lower Silurian rocks of 
Point Lévis (Lauzon seigniory) near Quebec, (many of the species having 
compound forms not before known among this family of fossils,) and 
proposed several new genera. (Report of Progress, Geol. Survey of 
Canada, 1857. See also the Canadian Naturalist and Geologist, vol. iii.) 
1859. J. Hall published Motes 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. (Zwelfth 
Report on the State Cabinet, Albany, pp. 45 and 58, 1859.) 
