HISTORY OF RESEARCH. clix 



described, and an admirable account is given of the history of previous research 



and opinion respecting the formation as a whole and its extra-Scanian equivalents. 



Some eight forms of Graptolites are recognised by the authors as characteristic of 



the formation. Of these the following are given as new : Olonograptus tenellus 



(Linnarsson) var. hians (Moberg), Clonogr. heres (Westergard), and Bryograptus 



Hunnebergensis (Moberg). 



iqq 6 A brief note on the Graptolites collected by Dr. J. W. 



Wood, E. M. E., Evans during his expedition to Bolivia in 1901 — 1902. 



" Graptolites from Seven species of Bolivian Graptolites are recognised; and 



Bolivia,'" Quart. Joura. on the evidence afforded by the collective assemblage the 



Geol. Soc.,' vol. lxii, containing strata are paralleled with the Upper Arenig 

 pp. 431, 432. . . . 



formation ot Britain. 



iqo> This comprehensive paper is devoted to the description 



Wood E. M. E. an d the discussion of the stratigraphy and palasontology of the 



" Tarauuou Series of Tarannon Formation as worked out in detail by the authoress 

 Tarannon," ' Quart. in the typical area of central Wales. The great vertical 

 Journ. (xeo"l. boa, extent of the formation is demonstrated and its conform- 

 able relations to the Llandovery Formation below and the 

 Wenlock above. It is shown to consist of four recognisable sub-formations, 

 marked by characteristic graptolitic sub-faunas. These are arranged in four zones, 

 namely, those of (1) Monograptus turriculatus, (2) Mono, crispus, (3) Mono. Gries- 

 toiiensis, (4) Mono, crenulatus. 



The immediately overlying Wenlock and underlying Llandovery local Grapto- 

 lite zones are also worked out, and their containing species noted. Some thirty- 

 eight forms of Graptolites are quoted from the Tarannon Series itself, of which 

 seven are survivals from the Llandovery beds and five range upwards into the 

 Wenlock Series. 



The paper is illustrated by tables showing (i) the correlation of the local 

 Tarannon sub-formations with their representatives elsewhere in Britain, Sweden, 

 and Bohemia, and (ii) the geological and geographical distribution of the species 

 of Graptolites identified in the typical Tarannon area. Upon one of these laities 

 the Graptolites are arranged in the order of their chronological appearance. 



1<)0( . In this Fifth Fart of the British Monograph the Historical 



Elles and Wood, Section embraces the period 1871 — 1880. The Descriptive 



" Monograph of British Section opens with an account of the structure and mode of 



Graptolites," pt. 2, development of the family of the Diplograptidae (Lapworth) 



Palaeontographical ^ mL The remainder f the p art is devoted to the 



Societv, 1906. . . . 



diagnoses and illustration ot the British forms belonging to 



the genus Climacograptus, Hall (which is assigned to that family) and its con- 

 stituent forms arranged under five different types. Nineteen British species of 

 Climacograptus are recognised, the following being described as new: Climaco- 



