PLATE XXVI -continued. 



FIGS. 



7 a — d. — Climacograptus tuberculatum, Nicholson. (Page 213.) 



7 a. Complete specimen, poorly preserved. Dobb's Linn. Lower Birkhill Shales. 



British Museum (Natural History), S. Kensington. 

 7 b. Ibid. 

 7 c. Ibid. 



7 d. Ibid.? 



8 a—f. — Climacograptus bicornis (Hall). (Page 193.) 



8 a. Specimen in full relief ; obverse view. Dobb's Linn. Lower Hart fell Shales (zone 



of Climacog. Wilsoni). Elles' Collection. 

 8 b. Slender specimen with small proximal spines. Kirkton Burn, Wanlock Head. Gleu- 



kiln Shales. Lapworth's Collection. 

 8 c. Long specimen. Glenkiln Burn. Lower Hartfell Shales (zone of Climacog. Wilsoni). 



Wood's Collection. 

 8 d. Scalariform view of specimen with stout spines. The Cornice, Hartfell. Hartfell 



Shales. Lapworth's Collection. 



8 e. Specimen with very long slender spines. The Cornice, Hartfell. Hartfell Shales 



(zone of Climacog. Wilsoni). Elles' Collection. 

 8/. Ibid. 



9 a — c. — Climacograptus bicornis, var. tridentatus, Lapworth. (Page 195.) 



9 a. Specimen with short virgella. Cleukiln. Glenkiln Shales. Lapworth's Collection. 

 9 b. Specimen with three equally prominent spines. Wanlock Water. Glenkiln Shales. 



Lapworth's Collection. (The reverse side of this specimen is iu the Sedgwick 

 Museum.) 

 9 c. Specimen with shorter spines enclosed in prominent disc. Glenkiln. Gleukiln 

 Shales. Lapworth's Collection. 



10 a — c. — Climacograptus bicornis, var. peltifer, Lapworth. (Page 196.) 



10 a. Specimen with proximal spines enclosed in a small disc. Dobb's Linn. Upper 



Glenkiln Shales. Wood's Collection. 

 10 b. Small specimen with large disc enveloping proximal end of polypary. Tiddyndicwm, 



N. Wales. Upper Glenkiln Shales. Sedgwick Museum. 



10 c. Typical specimen. Dobb's Linn. Glenkiln Shales. Lapworth's Collection. 



11 a — d. — Climacograptus supernus, Elles and Wood, sp. nov. (Page 196.) 



11 a. Typical specimen. Main Cliff, Dobb's Linn. Upper Hartfell Shales (zone of Dicellog. 



anceps). Wood's Collection. 

 11 b. Ibid. Elles' Collection. 

 11 c. Ibid. Wood's Collection. 



11 d. Specimen showing virgella and short spines. Ibid. 



12 a — J. — Climacograptus Wilsoni, Lapworth. (Page 197.) 



12 a. Typical specimen in partial relief. Main Cliff, Dobb's Linn. Lower Hartfell Shales 



(zone of Climacog. Wilsoni). Lapworth's Collection. 

 12 b. Specimen showing distorted position of sac. Ibid. 

 12 c. Specimen with sac in normal position. Ibid. 

 12 d. Long specimen in partial relief, sac broken off. Ibid. 



13. (Miiuacograi>lns Wilsoni, var. tubularis, Elles and Wood, nov. (Page 199.) 



13. Large specimen in relief showing long tubular virgella. Dobb's Linn. Lower Hartfell 

 Shales (zone of Climacog. Wilsoni). Lapworth's Collection. 



