xliv 



BRITISH GRAPTOLITES. 



In this year Michel recorded the existence of Silurian 

 shales, near Domfront, containing Gr. colonus, characteristic of 

 stage E. (A collection of Graptolites from this locality was 

 subsequently sent to Barrande, and he identified in addition 

 Gr. hohemicus.) 



In 1861 Salter figured from the Skiddaw Slates a new 

 Graptolite forming the type of a new genus. This is a Clono- 

 graptus, showing, however, only ten stipes. Salter observes 

 that it certainly does not belong to the genus Graptolithus, 

 which includes forms which are simple and perfect from end 

 to end, and concludes, " I shall shortly, I hope, describe the new branched 

 dichotomous form under the name of Dichograpsus." 



In 1861 Billings reviewed the work of Schmidt (' Silurische 

 formation von Estland,' 1858), and compared the geological 

 appearance of Graptolites in Europe and America, with 

 the intention of showing that the "occurrence of Graptolites 

 in rocks so ancient as those of the Quebec group is not 

 inconsistent with what we know of their geological range in 

 other countries," and that therefore they need not be of the 

 age of the Hudson River group. He concludes, however, that his investigations 

 tend to prove that "Graptolites cannot always be relied upon to show that exposures 

 of rock widely separated from each other are either of a different or of the 

 same asre." 



1860. 



Michel, 



" Coupe du terrain 



Silurian aux environs 



de Domfront.," ' Bull. 



Soc. Geol. de France,' 



ser. 2, vol. xvii. 



1861. 



Salter, 



" New Fossils from the 



Skiddaw Slates," 



' Geologist,' vol. iv. 



1861. 

 Billings, 

 " On the Occurrence of 

 Graptolites in the Base 

 of the Lower Silurian," 

 ' Canad. Naturalist and 

 Geologist,' vol. vi. 



1861. 



Dalimier, 



" Stratigraphie des 



terrains primaires 



dans la presqu'ile du 



Cotentin," ' Bull. Soc. 



Geol. de France,' ser. 2, 



vol. xviii. 



In the same year Dalimier recorded the occurrence of 

 Graptolites of the second Silurian fauna from the shales 

 and associated grits above the Fucoid grit in the Peninsula of 

 Cotentin. 



In 1861 M'Coy had noted the occurrence of several species 

 of Graptolites from the Palaeozoic rocks of Victoria in a 

 pamphlet published for the Intercolonial Exhibition. The 

 year following, 1862, the main results of his study of these 

 forms were published in England. He records the following 

 species: — Diplograpsus pristis, 1>. mucronatus, IK rectangularis, 

 J), ramosus, l>. folium, and 1). bicornis ; Phyllograptus typus ; 

 Didymograpsus serratulus, J), caduceus, D.furcatus; Graptolites gracilis, Gr. Logani, 

 dr. quadribrachiatus, Gr. octobrachiatus, Gr. ludensis, Gr. tenuis, Gr. latus, and Gr, 

 Sagittarius. 



1861-2. 



M'Coy, 



" Note on the Ancient 



and Recent Natural 



History of Victoria," 



' Ann. Mag. Nat. Hist.,' 



vol. ix. 



