PLATE XVIII. 

 Genus Amphigraptus, Lap worth. 



FIGS. 



1 . —Aiiiph igraptu s divergens (Hall) . 



Large specimen, Avell preserved. Mount Benger Burn, Selkirkshire. 

 Hartfell Shales. Lapworth's Collection. 



2 a — c. — Amphigraptus divergens, var. radiatus, Lapworth. 



2 a: Type specimen. Figured, Lapworth, Cat. West. Scott. Fossils, 

 1876, pi. iii, fig. 71. Hartfell Spa, Moffat, Hartfell Shales (zone 

 of Pleurog. lineaHs). Lapworth's Collection. 



2 h. Specimen with only four branches. Ibid. 



2 c. Narrow specimen, poorly preserved. Hartfell Spa. Hartfell 

 Shales. Geological Survey of Scotland, Edinburgh Museum. 



3. — Ampliigraptus distans, Elles and Wood, sp. nov. 



Type specimen. Barskeoch Burn, near St. John's, Dairy, Kirkcud- 

 brightshire. Hartfell Shales. Geological Survey of Scotland, Edinburgh 

 Museum. 



4. — Amphigraptus ? sp. Mount Benger Burn ?, Selkirkshire. Hartfell Shales. 

 Lapworth's Collection. 



