PLATE VI. 



OBTHONYcniA ACUTA, F. A. Bomer, sp. (Page 48.) 



ElG. 



1. Lateral view of a very elongate specimen, defective near the aj^ex, x f . 1 «, apical view, showing 



the size and shape of the oral margin. Top Orchard Quarry. Woodwardian Museum. 



2. Lateral view of a shorter specimen, which has been somewhat compressed in fossilisation. 2 a, 



apical view. Marwood Parish. Porter Collection. 



HoLOPELLA TENUisuLCATA, Sandhergev. (Page 51.) 



3. Cast of a small specimen, retaining a small portion of its surface, X 3. 3 «, surface, X 10. 



Kingdon's, Shirwell. Barnstaple Athenaeum. 



Etjomphalus vermis, n. sp. (Page 52.) 



4. Lateral view of a very small specimen, x 10. 4 a, apical view. Pilton. Porter Collection. 



Ehaphistoma JUNIUS, de Koninclc. (Page 54.) 



5. Lateral view of a specimen, retaining part of the surface, X 3. 5 a, apical view. 5 h, upper 



surface of a portion of a whorl, X 10, showing the ornament. Pilton. Porter Collection. 



6. Lateral view of another specimen, x 5. West of Saunton Court. "Woodwardian Museum. 



7. Lateral view of a rather lofty variety, X 5. 7 a, apical view showing the ornament, which is con- 



tinued further from the suture than usual. West of Saunton Court. Woodwardian Museum. 



Pleurotomaeia, sp. (Page 59.) 



8. A doubtful and imperfect specimen, partly retaining the ornament, but obscured in shape by lying 



aslant on the slab, X 10. Pilton. Porter Collection. 



Pleuhotomaeia Hamlingii, n. sp. (Page 56.) 



9. A well-preserved specimen, showing its shape and the sinus-band at the shoulder of the whorls, 



X 3. 9 a, portion of whorl, X 10. Kingdon's, Shirwell. Barnstaple Athenaeum. 



Pleueotomaria aspeea, Sowerhy. (Page 57.) 



10. Specimen of a mould, showing an unusually fine ornament, X 3. 10 a, wax cast taken from the 



same specimen, X 6 ; the elevated sinus-band is not clearly shown. 10 b, portion of whorl, 

 X 10. " Marwood beds, east of Barnstaple." Museum of Practical Greology. 



11. Another specimen, of rather elongate form and with coarser ornament, showing the convexity of 



the sinus-band, X 4. Petherwyn. Museum of Practical Geology. 



12. Cast of a specimen, which may be the original of Phillips's fig. 177*. Petherwyn. Museum of 



Practical Geology. 



13. Cast of a small specimen very doubtfully referred to this species, x 5. Poleshill. Porter 



Collection. 



Muechisonia anglica, d'Orligmj. (Page 59.) 



14. A small specimen, showing sinus-band, and apparently identical with the species figured by Phillips 



from Barnstaple, X 3. Pilton. Porter Collection. 



MuECHisoNiA, sp. (Page 60.) 



15. Specimen of a cast, but showing sinus-band, and very similar to an ordinary form of M. 



turlinata, Schlotheim, X f . Baggy Point. Museum of Practical Geology. 



