PLATE XXX— continued. 

 Figs. 



6 a — c. — Orthograptus calcaratus, var. priscus, Elles and Wood, nov. (Page 244.) 



6 a. Small narrow specimen, compressed, reverse aspect. Figured, 

 Hopkinson and Lapworth, ' Quart. Jonrn. Geol. Soc.,' 1875, vol. 

 xxxi, pi. xxxv, fig. 7 l>. Abereiddy Bay. Llandeilo (zone of 

 Didymog. Murchisoni). Sedgwick Museum. 



6 b. Long, incomplete specimen, showing characteristic view of tliecre. 

 Ibid., fig 7 c. 



6 c. Small broad specimen, compressed. Ibid., fig. 7 a. 



7 a — d. — Orthograptus rugosus, var. apiculatus, Elles and Wood, nov. (Page 245.) 



7 a. Typical specimen, preserved in low relief, obverse aspect. Laggan 



Gill, Girvan. Ardwell Beds. Geological Survey of Scotland. 

 7 b. Smaller perfect specimen, reverse aspect. Ibid. 

 7 c. Larger specimen, reverse aspect. On same slab as 7 b. 



7 d. Small specimen. Ibid. Lapworth's Collection. 



8 a — d. — Olyptograptus famariscus, Nicholson. (Page 247.) 



8 a. Small characteristic specimen. Duffkinnel. Birkhill Shales. 



Geological Survey of Scotland. 

 8 /;. Broader and longer specimen. Dobb's Linn. Birkhill Shales. 

 Wood's Collection. 



8 c. Characteristic specimen. Dobb's Linn. Birkhill Shales. Lap- 



worth's Collection. 

 8^. Specimen on cleaved rock, reverse aspect. Belcraig Burn. Birk- 

 hill Shales. Elles' Collection. 



9 a — d. — Qlyptograptus tamariscus, var. incertus, Elles and Wood, nov. (Page 249.) 



9 a. Characteristic specimen, incomplete. Dobb's Linn. Upper Birk- 



hill Shales. Sedgwick Museum. 



9 b. Ditto. Dobb's Linn. Upper Birkhill Shales. Lapworth's Col- 

 lection. 



9 c. Somewhat distorted specimen. Garple Linn, Moffat. Birkhill 

 Shales. Lapworth's Collection. 



9 d. " Bi-scalariform " view. On same slab as Fig. 9 c. 



10 a — c. — Olyptograptus terra fax, Elles and Wood, sp. nov. (Page 249.) 



10 a. Typical specimen. Belcraig Burn. Birkhill Shales. Wood's 



Collection. 

 10 b. Broader specimen showing virgula, obverse aspect. Ibid. 



10 c. Ditto, reverse aspect. On same slab as fig. 10 b. 



11a, b. — Olyptograptus serratus, var. barbatus, Elles and Wood, nov. (Page 250.) 



11 a. Typical specimen. Pary's Mount, Anglesea. Birkhill Shales 



(zone of Monog. Sedgwickii). Greenly's Collection. 

 11 b. Somewhat narrower specimen. Ibid. 



