PLATE LII. 



Genus Cyrtograptus. 



Figs. 



1 a — d. — Cyrtograptus Lnndgreni, Tullberg. (Page 507.) 



1 a. Incomplete, but typical specimen. Figured Elles, Quart. Journ. 



Geol. Soc, 1900, pi. xxiv, fig. 1 a. River Irfon, Builtli. 



Wenlock Shales (zone of Gyrtog. Lundgreni). Elles' Collection. 

 1 I). Ibid., fig. 1 B. Llwynrlieditb Quarry, Long Mountain. Wenlock 



Shales (zone of Gyrtog. Lundgreni)'. Elles' Collection. 

 1 c. Similar specimen. Same locality, etc., as fig. 1 h. 



1 d. Exceptionally large and complete specimen. Bridge, River Irfon, 



Builth. Wenlock Shales (zone of Gyrtog. Lundgreni). Collected 

 by Mr. A. M. Macgregor. 



2 a — c. — Gyrtograptns rigidus, Tullberg. (Page 508.) 



2 a. Specimen. Figured Elles, Quart. Journ. Geol. Soc, 1900, pi. xxiv, 



fig. 2 A. Dulas Brook, Builth. Wenlock Shales (zone of Gyrtog. 



rigidvs). Elles' Collection. 

 2 h. Ibid., fig. 2 b. River Irfon, Builth. Wenlock Shales (zone of 



Gyrtog. rigidus). Elles' Collection. 

 2 c. Smaller specimen. Ibid., fig. 2 c. Same locality as fig. 2 h. 



3. — Gyrtograptus hamatus (Baily). (Page 510.) 



Type specimen. Figured Baily, Journ. Geol. Soc. Dublin, 1861, pi. iv, 

 fig. 6 A. Townland of Garran Grena, Tipperary. Wenlock (r). 

 Geological Survey of England and Wales. 



4 a — c. — Gyrtograptus Garrutliersi, Lapworth. (Page 512.) 



4 a. Type specimen, showing form of proximal end. Figured Lapworth, 

 Geol. Mag., 1876, pi. x, fig. 6 a ; and Elles, Quart. Journ. Geol. 

 Soc, 1900, p. 408, text-fig. 21. Shankendshiels. Riccarton 

 Beds. Lapworth's Collection. 



4 h. Ibid., fig. 6 h. 



4 c. Ibid., fig. 6 c. River Slitrig. Riccarton Beds. LapAvorth's 

 Collection. 



5. — Gyrtograptus Grayl, Lapworth. (Page 512.) 



Type specimen. Figured Lapworth, Geol. Mag., 1876, pi. xx, fig. 11. 

 Penwhapple Glen, Girvan. Top of Penkill Beds. Mrs. Gray's 

 Collection, Edinburgh. 



