PLATE II. 

 Fig. Page, 



Agnostus altus, Gronwall. 12 



1. A much distorted and somewhat flattened specimen. Menevian; Waterfall Valley, 



Maentwrog. Sedgwick Museum, Cambridge. 



Agnostus barrandei, Salter. L3 



2. Our ul' Eicks's figured types. Menevian; Pen-pleidiau, St. David's. Sedgwick Museum, 



Cambridge. (Figured by Hicks, Quart. Journ. Geol. Soc, vol. xxviii, pi. v, fig. 5.) 



Agnostus rotundus, Gronwall. 1 1 



3,4. Nearly complete, but very much distorted specimens. Menevian; St. David's. Museum of 

 Practical Geology, uos. 87-44 (fig. 3) and 8749 (fig. 4). 



Agnostus nudus (Beyrich). 15 



5. A poorly preserved specimen ; the thoracic segments cannot be distinguished owing to the 

 slate of preservation. Menevian ; Dolgelly. British Museum, No. 58482. 



Agnostus eskriggei, Hicks. 16 



(i. The only specimen known. Menevian; Porth-y-rhaw, St. David's. .Sedgwick Museum, 

 Cambridge. (Figured by Hicks, Quart. Journ. Geol. Soc, vol. xxviii, pi. v, fig. 7.) 



Agnostus barlowi, Belt. 10 



7. The most nearly perfect specimen in the Belt Collection. Stated by Bell to be from the Lower 



Tremadoc, Dolgelly; but the horizon probably wrong. British Museum, no. 58498. 

 (Probably the original of one of Belt's figures in Geol. Mag., vol. v, pi. ii, figs. 17, 18.) 



Agnostus cambrensis, links. 17 



8. Head. Harlech Series ; St. David's. Sedgwick Museum, Cambridge. 

 !:>. Tail. Harlech Series ; St. David's. Sedgwick Museum, Cambridge. 



AgnOStuS integer (Bey rich). 18 



10. A somewhat distorted specimen. Menevian; Porth-y-rhaw, St. David's. Sedgwick .Museum, 



Cambridge. (Figured by Hicks as Agnostus cambrensis, Quart. Journ. Geol. Soc, vol. 

 xxviii, pi. v, fig. 1.) 



Agnostus securiger, sp. uov. 20 



11. A complete individual. Cambrian; Chapel End, near Nuneaton. Collected l»v Mr. Sykes. 



Agnostus fallax, Linnarsson. 20 



12. Head. Menevian; Porth-y-rhaw, St. David's. Sedgwick Museum, Cambridge. 



