ON THE STOCKDALE SHALES. 



7H 



His succeeding zone of Monograptus gregarius, containing also 

 Monog7\iptus Jimhriatus and Ilastrites per egrinus, is in the position of 

 our zone of M.fimbi^iatus^ which contains the same forms. 



Above this is TuUberg's zone of Monograptus convolutus. It also 

 contains M. lobiferus, M. leptotJieca, M. commmiis, Uastrites pere- 

 grinus, and Petalograptus folium. All these forms occur in the 

 convolutus-zone of the Lakes, except H. peregri7iiis, which is replaced 

 hy H. liyhriclus ; there seems therefore to be^no representative of the 

 thin argenteus-zone in Scania. 



The zones of Petalograptus cometa and Monograptus spinigerus 

 are united together in Scania. TuUberg finds in this zone M. spini- 

 gerus, M. intermedius (=discretus, Nich.?), M. Cling ani, M. argutus, 

 Diplogi^aptus Hughesii, and Petalograptus cometa. 



The zone of Bastrites maximus is doubtfully represented. He 

 refers certain shales seen at Tosterup with Monograptus turriculatus 

 and M. crispus to this horizon ; but we believe that this and the 

 succeeding zone of Monograptus uncinatus are really referable to 

 the Browgill Beds. The beds which TuUberg compares with the 

 Gala Group of Scotland, and which are therefore comparable with 

 the Browgill Beds, are (in ascending order) : — The zones of Cyrto- 

 graptus Orayce, Lapw., Cyrtograptus ? spiralis, Gein., Cyrtograptus 

 Lapworthi, TuUb., forming the base of his Cyrtograptiis-beds. We 

 feel doubt as to whether these are all separable from the two 

 upper zones of his Hast^^ites-beds. 



In our district Cyrtograptus'^ spiralis occurs abundantly below 

 the band with Cyrtograptus Grayce ; but as the former species appa- 

 rently ranges into the Wenlock Beds of Britain, it probably occurs 

 in the representatives of the Gala Group, both above and below the 

 band with Cyrtograptus Grayoe. 



We just now alluded to the zone of Monograptus cyphus as being 

 probably referable to our zone of Dimorphograptus confertus. In 

 1881, Baron Kurck described a section at the quarry of Bollerup 

 which exhibits the zone of Monograptus cyphus and the base of the 

 zone of Monograptus gregarius. Prom the cyphus-loeds he records : — 



Monograptus cyphus, Lapw. 



revolutus, Kurck. 



attenuatus, Hoiik. 



Dimorphograptus Swanstoni,iapw. 

 cf. Swanstoni, La;pw. 



Diplograptus tamariscus, Nich. 



longissimus, Kurck. 



Olimacograptus undulatus, Kurck. 

 Discinocaris Brouniana, Woodw. 



The second Dimorphograptus is described and figured, and agrees 

 in every particular with a species described and figured by one of us 

 in the Society's Journal for 1868*, under the name of Diplograptus 

 confertus, ^STich. The discovery of more perfect specimens has shown 

 us that this is in reality a Dimorphograptus, and we have named the 

 zone in which it occurs after it. In the cyphus-zone at Bollerup 

 five species of Graptolites out of the eight recorded are found also in 

 our zone, and we have no hesitation in asserting that the Dimorpho- 



* " On the Graptolites of the Coniston Flags," Q. J. G. S. vol. xxiv. p. 526. 



