HISTORY OK RESEARCH. 



cxlix 



1901. 



Strandmark, J. E., 



" Undre Graptolit- 



skiffer vid Fagelsang," 



'Geol. FOren. F6rh.,' 



vol. 23, pp. 548-556, 



pi. xvii. 



inter-relationships. 



The author gives a description of the so-called " Lower 

 Graptolite Shales " of Filgelsang, noting the lithological and 

 palasontological sequence. He figures (taf. 17) the species 

 Tetragraptus Bigsbyi, Hall, and Tetragraptus phyllograptoides, 

 Linnrs., and also a remarkable new form, Phyllograptus cor 

 Strandmark, and discusses their probable phylogenetic 



1901. 



Elles and Wood, 



" Monograph of British 



Graptolites." (Edited 



by Chas. Lapworth.) 



pt. 1, pp. 1-54. 



Palaeontographical 



Society, 1901. 



The Monograph opens with a brief Introduction by the 

 Editor, giving an account of the origin, object, and plan of 

 the work and of the mode of illustration. The First Part is 

 devoted to the description and figuring of the British forms 

 assigned to the Genus Didymograptus of the family of the 

 Dichograptidse. The illustrations include quarto plates 

 (I — IV), in which the species are represented on the natural 

 scale, and Text-figures (1 — 35), in which minor details are 



given on a scale of five times the natural size. Some twenty-eight species are 



described, of which the following are noted as new : Didymograptus uniformis, 



D. similans, D. deflexus, D. amplus, D. artus, D. stabilis, and I), acutidens 



(Lapw. MS.). 



The Descriptive Section is prefaced by short definitions of the morphological 



terms employed, and a synopsis of the several groups of Didymograptus recognised. 



At the close of the description of each such group the individual characteristics 



of its component forms are tabulated and compared. 



1901. The author summarises the results of his long-extended 



Malaise, C, and successful researches into the geology and fossils of the 



" Etat acttiel de nos 



connaissances sur le 



Silurien de la 

 Belgique," ' Annales 

 Soc. Geol. du Nord,' 

 vol. xxx, pp. 188-190. 



Cambrian, Ordovician, and Silurian deposits of the Massif 

 of Brabant, and the Band of Sambre and Meuse, and gives 

 a generalised scheme of the sequence in each area. Especial 

 attention is directed to the close parallelism between the 

 British and Belgian palasontological succession, and to the 



recognised presence of the same characteristic forms of Graptolites in several 



corresponding horizons in the two countries. 



An account of the author's study of the Silurian Succession 

 in the peninsula of Crozon, with lists of the fossils detected. 

 Seven successive Graptolite Zones are recognised, ranging 

 from the equivalents of the British Upper Llandovery to 

 those of the Lower Ludlow, both inclusive. Some nineteen 

 forms of Graptolites are distinguished as present, and their 

 horizons indicated. 



1901. 



Kerforne, F., 



" Silurique de la 



presqu'ile de Crozon 



(Finistere)," Rennes, 



1901, pp. 1-230. 



