PLATE XVI. 



LeptOgraptUS— co utinu ed— and Pleurograptus, Nicholson. 



FIGS. 



1 a — e. — Leptograptus validus, Lapworth, MS. 



1 a. Typical specimen, in relief. Spy Burn, Shropshire. Eorrington Flags {Leptog. 



validus Beds). H.M. Geological Survey Collection. 

 1 b. Somewhat broader form. Spy Burn, Shropshire. Eorrington Mags {Nemagraptus 



[Goenograptus] Beds). H.M. Geological Survey Collection. 

 1 c. Isolated stipe in full relief. Spy Burn, Shropshire. Eorrington Flags {Leptog. validus 



Beds). H.M. Geological Survey Collection. 

 1 d. Isolated stipe, not in relief. Spy Burn. Eorrington Flags {Leptog. validus Beds). 



Lapworth's Collection. 



1 e. More curved form, showing sicula. On same slab as fig. 1 d. 



2 a, b.- — Leptograptus validus, var. incisus, Lapworth, MS. 



2 a. Typical form, showing the sicula. Sowen Burn, Wanlock Head, nr. Sanqidiar. 



Glenkiln Shales. Lapworth's Collection. 



2 b. Distal part of isolated stipe. Ibid. 



3 a, b. — Leptograptus, sp. 



3 a. Isolated stipe in good preservation. Bassenthwaite Sand-beds. Upper Skiddaw 



Slates. Postlethwaite's Collection. 



3 b. Isolated stipe, showing rapid widening. On same slab as fig. 3 a. 



4 a — d. — Leptograptus grandis, Lapworth, MS. 



4 a. Specimen showing general form. Glenkiln Burn. Glenkiln Shales. Lapworth's 



Collection. 

 4 b. Specimen with stipes diverging at a wider angle. On same slab as fig. 4 a. 

 4 c. Isolated stipe, showing great width. On same slab as figs. 4 a and 4 b. 



4 d. Well-preserved specimen, showing details of proximal end. Glenkiln Burn ? Glenkiln 



Shales. Lapworth's Collection. 



5 a — e. — Leptograptus latus, Elles and Wood, sp. nov. 



5 a. Very large specimen, preserved in low relief. Spy Burn, Shropshire. Eorrington 



Flags {Leptograptus Beds). H.M. Geological Survey Collection. 

 5 b. Typical specimen, showing rapid widening. Spy Burn, Shropshire. Eorrington Flags 

 {Nemagraptus \_Cainograptus~] Beds). H.M. Geological Survey Collection. 



5 c. Well-preserved, typical specimen. Ibid. 



6 d. Isolated stipe, distal part. On same slab as fig. 5 b. 



5 e. Obverse view. Spy Burn. Eorrington Flags {Nemagraptus \_Ccenograptus~] Beds). 



H.M. Geological Survey Collection. 



6 a, b. — Leptograptus ascendens, sp. nov. 



6 a. Typical form with stipes crossed. Foot of Hawkwood Burn, Abington. Glenkiln 



Shales. Geological Survey of Scotland, Edinburgh Museum. 

 6 b. Specimen with stipes less curved and uncrossed. Pulmaddy Burn, nr. Carsphairn, 

 Kirkcudbrightshire. Glenkiln Shales. Geological Survey of Scotland, Edinburgh 

 Museum. 



7. — Pleurograptus linearis (Carruthers). 



Type specimen. Figured, Nicholson, Geol. Mag., 1867, vol. iv, pi. xi, fig. 1 ; and 

 Monograph of British Graptolites, p. 111. Hartfell Spa. Hartfell Shales. British 

 Museum (Natural History), S. Kensington. 



