712 ME. J. E. MARE AN^D DE. H. A. K^ICHOLSON- 



graptus-confertus zone of the Skelgill Beds is the British representa- 

 tive of the cyphus-zojie of BoUerup. The lowest band of the gre- 

 gariiis-zone which is seen in the quarry at Bollenip contains Mono- 

 graptus triangulatus, Harkn., and this is a reason for supposing that 

 the section at Spengill, where beds with Monograptus triangulatus 

 occur immediate^ above the confertus-zone, is complete. 



In a former paper read before the Society in 1880*, one of the 

 writers in describing the shales at the base of Barrande's band 

 E. e. 1. in Bohemia, expressed the opinion that " not only does this 

 zone rejpresent the Birkhill Shales, but it can, like them, be divided 

 into a series of subzones characterized by various species of Grrapto- 

 lites," though the actual succession of the zones was not determined. 

 This opinion is justified by the researches of Dr. Tullberg who, in his 

 * Skanes Graptoliter,' when discussing the theory of " Colonies," 

 gives the results of his examination of a series of specimens from 

 these colonies, and from the corresponding beds at the base of E. e. 1. 

 He recognizes the following zones : — 



1. Zone of Monograptus gregciHus, 2. Zone with M. leptotheca 

 and i¥". lohiferus, 3. Zone with if. turriculatus, and 4. Zone with 

 Cyrtograjptus ? spiralis^ besides others of Wenlock and Ludlow age. 



From Colonic Krejci he recognizes Hastrites peregrinus^ Mono- 

 graptiis gregarius, 31. Jimhriatus, M. triangulatus, M. lohiferus, M. 

 lejptotJieca, and Climacograptus scalaris. 



This corresponds with the fauna of his gregariiis-zone in Scania 

 and of OUT fimhriatus-zone. 



In Colonic Haidinger he finds Monograptus lohiferus, M. triangula- 

 tus, M. convolutus, M. communis, Climacograptus scalaris, Diplograp- 

 tus, dr. folium, 1). tamariscus, and. Hastrites peregrinus. He compares 

 this with the fauna of his zone of Monograptus leptotheca, corre- 

 sponding with ours of M. convolutus. 



In Colonie D'Archiac he has recognized Monograptus lohiferus and 

 M. triangulatus in one bed, M. proteus in another, and Cyrtograptus ? 

 spiralis in a third, and supposes that here are representatives of his 

 zones of M. leptotheca, M. runcinatus, and Cyrtograptus ? spiralis. 



To these we would add the occurrence of the zones of Monograp- 

 tus spinigerus and either Rastrites maximus or Monograptus turricu- 

 latus in the Colony of Hodkovicek, and of the former zone in the 

 colonies D'Archiac and Haidinger. 



Two specimens of shale from the Lower Palaeozoic Beds of Hof, 

 Bavaria, are mounted on a tablet in the Woodwardian Museum. 

 These pieces contain the fossils of our zone of Monograptus Jimhria- 

 tus, viz : — 



Monograptus fimbriatus, Nick. 



attenuatus, Hofth. 



tenuis, Fortl. 



gregarius, Lapw. 



Eastrites peregrinus, Barr. 

 Diplograptus modestus, Lapw. 



vesiculosus, Nich. 



Chmacograptus normaHs, Lapw. 



A comparison of thenon-Graptolitic fauna of the Stockdale Shales 

 * Q. J. G. S. vol. xxxvi. p. 604. 



