312 



BRITISH GBAPTOLITES. 



commonly associated with Climacog. Wilsoni, Dicranog. Nicholsoni, and Climacog. 

 Scharenbergi. 



Collections.- — Geological Survey of Scotland, Sedgwick Museum, Swanston, 

 Lap worth, and the Authors. 



Fig. 206. — Glossograptus Hincksii, var 

 ftmbriatus (Hopk.). 



~-- 







Var. fimbriatus (Hopkinson). Plate XXXIII, figs. 3 a— d. 



1872. Diplpgraptm fimbriatus, Hopkinson, Geol Mag., vol. ix, p. 506, pi. xii, fig. 8. 

 1898. Glossographis fimbriatus, Elles, Quart. Journ. Geol. Soc, vol. liv, p. 521, fig. 32. 



In addition to the large form just described there occasionally occurs in the 

 same beds, or more rarely at a lower horizon, a similar but much smaller form 



which Hopkinson separated as a distinct species, 

 but which we consider is best regarded merely as a 

 variety of Glossog. HincJcsii. It differs from the 

 typical form not only in point of size but in being 

 somewhat less robust and in having somewhat 

 shorter and more delicate spines. 



Horizon and Localities. — Arenig, Upper Skiddaw 

 Slates (Ellergill Beds) ; Llandeilo, Glenkiln Shales. 

 S. Scotland: Wanlock Water, Wanlock Head; 

 Wandel Water, near Abington ; Rein Gill, Wandel 

 Water ; Brownhill Burn, near junction with Water 

 of Deugh ; Minnoch Water. 



Wales : Tiddyndicwm, Penmorfa. Lake District : 

 Ellergill ; Mosedale Beck, near Troutbeck ; Barf. 

 Ireland : Doolough, Co. Mayo. 



Associates, etc. — Var. fimbriatus occurs in the Upper Skiddaw Slates, but its 

 associates are only definitely known at Ellergill, where it occurs in the beds with 

 Didi/mog. bifidus, etc. In S. Scotland it occurs in the Glenkiln Shales in fair 

 abundance associated with Dicellog. sextans, and var. ex'dis, Dicranog. rectus, 

 Nemag. gracilis, Didymog. sup'vrstes, Amplexog. perexcavaius, etc. 



Collections. — Geological Survey of Scotland, Sedgwick Museum, British Museum 

 (Natural History), Muff and Carruthers. 



-1/ 



Complete specimen. Brownhill Burn, 

 near junction with Water of Deugh, 

 Kirkcudbright ; Glenkiln Shales. 

 Coll. Geol. Survey of Scotland. 



Glossograptus armatus, Nicholson. Plate XXXIII, figs, ha — e. 



1869. Glossograjrfus armatus, Nicholson, Ann. Mag. Nat. Hist. [4], vol. iv, p. 234, pi. xi, fig. 8. 

 1898. Glossograptus armatus, Elles, Quart. Journ. Geol. Soc, vol. liv, p. 523, fig. 33. 

 1898. Glossograptus cfr. HincJcsii, Elles, loc. cit., vol. liv, p. 522. 



Polypary small, about 1 cm. in length, and having an average uniform breadth 

 of rather less than 2 mm. Virgella distinct, basal spines very long and 



