PLATE XXIV. 

 Genus Dicranograptus, Hall. 



fios. 



1 a — i. — Dicranograptus Clingani, Carr. (Page 165.) 



1 a. Type specimen. Figured, Carruthers, Geol. Mag., 1868, vol.v, pi. v, fig. 6 a. Hartfell 



Spa. Hartfell Shales. Museum of Natural History, S. Kensington. 

 1 b. Specimen figured, Hopkinson, Geol. Mag., 1870, vol. vii, pi. xvi, figs. 4 a— b. Dobb's 



Linn. Hartfell Shales. Sedgwick Museum. 

 1 c. Specimen with small axillary angle. Dobb's Linn. Hartfell Shales. Lapworth's 



Collection. 

 1 d. Typical form. Hartfell Spa. Hartfell Shales. Museum of Natural History, S. 



Kensington. 

 1 e. Specimen with large axillary angle. Eailway cutting, Conway, N. Wales. Hartfell 



Shales. Lapworth's Collection. 

 1 /. Typical form. Dobb's Linn. Hartfell Shales. Lapworth's Collection. 

 1 g. Small, well-preserved specimen. Ibid. 

 I'll. Ditto. 



1 i. Ditto. 



2 a — b. — Dicranograptus tar dius cuius, Lap worth, MS. (Page 167.) 



2 a. Specimen with long stipes. Ardmillan Brae, Grirvan. Balclatchee Beds. Mrs. Cray's 



Collection, Edinburgh. 



2 b. Specimen with well-preserved biserial portion. Ibid. 



3 a — d. — Dicranograptus brevicaulis, Elles and Wood, sp. nov. (Page 168.) 



3 a. Typical form in low relief. Spy Burn, Shropshire. Rorringtou Flags (" Goenograptus " 



Beds). H.M. Geological Survey Collection. 

 3 b. Somewhat flattened specimen. Ibid. 

 3 c. Typical specimen in partial relief. Spy Burn. Rorringtou Flags. Lapworth's 



Collection . 



3 d. Small specimen, figured, Lapworth, as D.formosus, Hopk., Cat. West. Scott. Foss., 



pi. iii, fig. 75. Birnock Water. Glenkiln Shales. Lapworth's Collection. 



4 a — e. — Dicranograptus rectus, Hopkinson. (Page 169.) 



4 a. Well-preserved typical specimen. Birnock Water. Glenkiln Shales. Lapworth's 



Collection. 

 4 b. Poorly preserved specimen. Wanlockhead. Glenkiln Shales. Lapworth's Collection. 

 4 c. Poorly preserved specimen. Figured, Salter, as D. ramosus, Quart. Journ. Geol. 



Soc, 1849, vol. v, pi. i, Fig. 7. Loch Ryan. Glenkiln Beds. Geological Society 



of London. 

 4 d. Ditto. 



4 e. Typical form, but indifferently preserved. LagganGill, Glengonner Water. Glenkiln 



Shales. Geological Survey of Scotland, Edinburgh Museum. 



5 « — b.— Dicranograptus celticus, Elles and Wood, sp. nov. (Page 170.) 



5 a. Typical specimen, slightly distorted. Gleutewing Burn, Duneaton Water. Glenkiln 



Shales. Geological Survey of Scotland, Edinburgh Museum. 



5 b. Undistorted specimen. Rein Gill, Wandel Water. Glenkiln Shales. Geological Survey 



of Scotland, Edinburgh Museum. 



6 a — b. — Dicranograptus ramosus, Hall. (Page 175.) 



6 a. Typical form. Dobb's Linn. Hartfell Shales. Sedgwick Museum. 



6 b. Flexed form, doubtfully referable to this species. Syart Law, Peebleshire. Hartfell 



Shales. Lapworth's Collection. 



7 a — c. — Dicranograptus ramosus, var. longicaulis, Lapworth, MS. (Page 177.) 



7 a. Typical form. Hartfell Spa. Hartfell Shales. Lapworth's Collection. 



7 b. Specimen figured, Hopkinson, as D. ramosus, Geol. Mag., 1870, vol. vii, pi. xvi, fig. 5 a. 

 Dobb's Linn. Hartfell Shales. Sedgwick Museum. 



7 c. Specimen with very long biserial portion. Hartfell Spa. Hartfell Shales. Lapworth s 



Collection. 



8 a — c. Dicranograptus ramosus, var. spinifer, Lapworth, MS. (Page 176.) 



8 a. Large specimen with incomplete biserial portion. Sowen Dod, Wanlockhead. 



Glenkiln Shales. Lapworth's Collection. 

 8 b. Biserial portion showing spines. Cairn Hill. Glenkiln Shales. Lapworth's Collection. 

 8 c. Typical form. Railway Cutting, Kirkton. Glenkiln Shales. Geological Survey of 



Scotland, Edinburgh Museum. 



