clxvi 



BRITISH GRAPTOLITES. 



1909. 



Jones, 0. T., 



" The Hartfell-Valen- 



tian Succession around 



Plynlimon and Pont 



Erwyd," 'Quart. Journ. 



Geol. Soc.,' vol. lxv, 



pp. 463-537. 



An admirably detailed description of the local members 

 and. distribution of the lithological and palseontological 

 succession, as worked out by the author, in the Plynlymmon 

 District, Central Wales, through strata ranging from Upper 

 Bala to Middle Tarannon (zone of Dicellograptus anceps to 

 zone of Muuograptus Griestuniensis). The strata described are 

 locally rich in Graptolites. More than 100 distinct forms 

 are recognised as present by the author ; their distribution in the several local 

 formations, stages, and zones is tabulated, and paralleled with their known 

 arrangement in equivalents elsewhere in Britain. Two new species of Graptolites, 

 Monogrouptus atavus and M. Rheidolensis, are figured and described. 



The authors record the occurrence of Plectograptus 

 macilentus (Tornquist), Betiolites spinosus (Wood), Gotho- 

 graptus nassa (Holm), in the Seaman-Colo mis Shales. The 

 structure of the first named, which is made the type of a new 

 genus, is described and figured in detail. For the central 

 rod-like body, or " filiform organ," figured by Holm in his 

 Gothograptus nassa, and provisionally termed " Virgula" by 

 AViman — with the reservation, however, that it is not apparently morphologically 

 identical with the virgula of the Diplograptidaa — the authors of this paper propose 

 the neutral title of " fulcell " (Latin " fulcimen," a prop or stay). 



1908-9. 



Moberg, J. C, and 



Tornquist, S. L., 



" Retioloidea SkSues 



Colonusskiffer," 



, Sveriges Geol. Under- 



sokning.'Arsbok 2, no. 5. 



1909. 

 Hall, T. S., 



" Notes on Graptolites 



from Tallong, New 



South Wales," 



' Records Geol. Surv. 



N.S. Wales,' vol. viii, 

 pp. 339-341, pi. lv. 



A list of twelve forms of Graptolites collected b} r the 

 officers of the New South Wales Geological Survey. The 

 majorit3 T are identified with previously known species, but 

 one variety (Dicranograptus hians (T. S. Hall) var. apertus) 

 is noted as new. 



1910. 

 Moberg, J. C, 



In this valuable memoir the author gives a minutely detailed 

 description of the most important Cambrian, Ordovician, and 

 Silurian fossiliferous localities in Scania including the famous 

 Graptolite-bearing areas of Fogelsiing, Jerrestad, Rostanga, 

 Tosterup, etc., illustrating the work by many maps, tables of 

 local zonal sequence, and by a bibliography ranging from 1827 

 The long extended, detailed, and successful researches of Prof. 

 Moberg in the Lower Palaeozoic rocks and fossils of Scania give an especial authority 

 to this memoir, and it is certain long to remain the standard field guide to the 

 region. 



"Guide fur the Principal 



Silurian Districts of 



Scania," 'Geol. Foren. 



Forhandl.,' vol. 32, 



pp. 45-194. 



to 1909 inclusive. 



