PLATE IV. 



Pig page. 



Shumardia pusilla (Sars). 40 



1. An inrolled specimen: head, with the exception of the doublure, removed, thus exposing 



the interior of the tail. Shinetou Shales ; Shineton. Collected by Mr. Rhodes. 

 Geological Survey, R. R. 2282. 



2. Young. Shineton Shales ; Shineton. Collected by Mr. Rhodes. Geological Survey, 



R. R. 2296. 



3. Young. Bronsil Shales (Tremadoc) ; South Malverns. Oxford University Museum. 



(Figured by Groom as Aeanthoplevrella Orindrodi, Geol. Mag., 1902, p. 72, fig. 3.) 



4. Young. Shineton Shales ; Shineton. Collected by Mr. Rhodes. Geological Survey, 



R. R. 2286. 



Shumardia pusilla, var. morvensis, var. nov. 43 



5. Internal cast. Upper Tremadoc ; Penmorfa. Collected by Mr. W. G. Fearnsides. 



Sedgwick Museum. 



Orometopus elatifrons (Angelin). 46 



6. Cranidium. Shineton Shales ; Shineton. Collected by Mr. E. S. Cobbokl. Sedgwick 



Museum. 



7. An imperfect cranidium, showing in the matrix the impression of the neck-spine. Shineton 



Shales ; Shineton. Collected by Mr. Rhodes. Geological Survey, R. R. 2294. 



8. Cranidium and thorax. Shineton Shales ; Shineton. Collected by Mr. Rhodes. Geological 



Survey, R. R. 2294. 



9. The most complete specimen known ; an external mould. Shineton Shales ; Shineton. 



Collected by Mr. E. S. Cobbold. Sedgwick Museum. 



10. Hypostome and doublure. Shineton Shales ; Shineton. Collected by Mr. Rhodes. 



Geological Survey, R. R. 2294. 



Orometopus prsenuntius (Salter). 48 



11. An entire but somewhat compressed specimen. Upper Tremadoc; Penmorfa. Collected 



by Mr. W. G. Fearnsides. Sedgwick Museum. 



The small outlines, filled in with a flat shade and placed by the side of the enlarged figures, 

 show the actual size of the specimens. 



