HISTORY OF RESEARCH. 



el 



xvn 



1910. 



Ellen and Wood. 



" Monograph of British 



Graptolites," pt. 2, 



Palseontographical 



Society, 1910. 



1910. 



Fricke, M. 



" Die Siluri8chen Abla- 



gerungen am Siidrande 



des Zwickauer 



Kohlenbeckens, " 



pp. 1-53. 

 Zwickau, 1910. 



This Part of the Monograph is wholly Descriptive. It is 

 introduced by a section dealing with the general character- 

 istics of the family Monograptidae and of the genus Mono- 

 graptus, followed by diagnoses and illustrations of British 

 species belonging to the first three of the seven component 

 groups of Monograpti recognised by the authors. None of 

 the species described are named as new, but several forms previously regarded as 

 species by other authors are here classed as varieties. 



A privately printed geological and palasontological memoir 

 on the Silurian strata south of Zwickau, Saxony, with special 

 reference to the Graptolite fauna. The work is somewhat 

 popular in character, but apparently the result of several years' 

 enthusiastic research. It is introduced by a discussion of the 

 results obtained by previous researchers in the neighbouring 

 regions of Thuringia, etc., and embraces a brief description, 

 illustrated by many good text-figures, of the typical forms and 

 structures of the Graptolites in general. A list of the local Graptolites of the 

 region, including some eighty species and varieties, is carefully tabulated, the forms 

 cited being grouped for eight different localities, and in the zones and sub-zones 

 previously denned by Eisel, to whose long extended labours and successful results 

 in the equivalent Graptolitic deposits of Thuringia appropriate references are made. 



The author describes and figures Thuringian examples of 



his species, Gyrtograptus radians (Tornquist) (see bd. 9, p. 491) 



and a remarkable new form, Gyrtograpims multiramis. He 



appends sundry historical and critical observations upon the 



detailed grouping of the Monograptidas in general, and of 



several of the forms referred to by Jaekel (1899) and Freeh 



(1897) in particular. 



A brief summary of the existent state of knowledge and 



opinion respecting the Graptolites in general, their structure, 



development, classification, systematic position, and geological 



and geographical range. Two main sections — viz. Graptoloidea 



and Dendroidea — are recognised, united under the collective 



title of Graptolithina. The article is illustrated by figures of the adult polypary 



in several of the more characteristic genera, and of the sicula and the early parts 



of the polypary in the best known species. 



1911. 



Hadding, A., A welcome summary, discussion, and extension of previous 



" Svenska Arteriia af knowledge and opinion respecting the geological distribution, 

 Sliiktet Pterograptus, , ,.. „ J . n , , TT , . n 



TT , „ e _ . _, . range, and alliances of the genus Fteroqraptus, Holm, lllus- 

 Holm, ' Geol. Foren. & ' - & j l 



Forhandl ' vol 33 trated by clear and instructive figures, 

 pp. 487-494, pi. vii. 



1910. 

 Tornquist, S. L., 

 " Cyrtograptus-axttiY 

 fran Thuringen, etc.," 

 ' Geol. Foren. For- 

 handl.,' vol. 32, 

 pp. 1559-1575, pi. lxii. 



1910. 

 Lapivorth, C. 

 " Graptolites, " t ' Ency- 

 clopaedia Britannica,' 

 11th ed., vol. xii, 

 pp. 365-367, figs. 1-28. 



