PLATE I. 



Fig. 



1. Scapkaspis Zlot/dii, showings a, T^ortion of th.e test. Cornstones, Herefordshire. In 



the collection of the late Mr. Wyatt-Edgell. 



2. A well-preserved internal cast, showing the lines of growth and anterior convergent 



ridges ; from Shropshire. In the collection of the late Mr. Wyatt-Edgell. 



3. Internal cast ; from Cradley, Herefordshire. In the author's cabinet. 



4. A specimen showing a large portion of the test; from Herefordshire. In the 



collection of the late Mr. Wyatt-Edgell. 



4 a. Anterior portion of the same, enlarged three diameters, to show the irregular 

 striation of the anterior margin and mucous-gland-pits. 



4 6. Ornamentation of the surface, to show the crenation of the ridges. 



5. A fine internal cast. Herefordshire. In the collection of the Rev. J. Crouch. 



6. An internal cast ; from Cradley, Herefordshire. In the author's cabinet. 



7. A large internal cast; from Herefordshire. In the collection of the Rev. 



J. Crouch. 



d points to the lateral emargination, representing the cornua. 

 a to the rostral region. 



8. A specimen showing nearly the entire surface of the test ; from Herefordshire. 



In the collection of Mr. Lightbody, of Ludlow. 



9. A small example of Sc. Lloydii. Agassiz's type specimen of Ce^Jialaspis Lewisii, 



figured ' Poiss. foss.,' Tab. 1 b, fig. 8 



10. One of Agassiz's type specimens of Ceplialaspis Lloydii, figured 'Poiss. foss.,' 



Tab. 1 h, fig. 10. 



11. A much crushed and indistinct cast of Sc. Lloydii. Cradley. In the author's 



cabinet. 



