PLATE IV. 



GoNiATiTES, sp. (Page 25.) 

 Tig. 



1. Specimen, showing the inflexion of the whorla about the umbilicus, x 2. la, another view. 



Barnstaple. Woodwardian Museum. 



Agoniatites, sp. (Page 24.) 



2. Specimen, much obscured by matrix, but retaining signs of septa and of tubercles round the 



umbilicus. Kingdon's, Shirwell. Barnstaple Athenaeum. 



PoTEBiocEEAS ? sp. (Page 27.) 



3. Specimen, much obscured by matrix, but giving the general shape. 3 a, another view, showing 



the position of the siphuncle. Kingdon's, Shirwell. Barnstaple Athenseum. 



Oethoceras speciosum:, Munster. (Page 29.) 



4. Specimen, showing the septa. 4 a, transverse section. Kingdon's, Shirwell. Barnstaple 



Athenseum. 



Poteeioceeas ? sp. (Page 28.) 



5. Specimen, figured by Phillips as Orthoceras imbricatum, Hisinger. Marwood. Museum of 



Practical Geology. 



Oethoceeas, sp. (Page 32.) 



6. Natural section of a specimen showing the septa, the siphuncle, and the vasiform envelope of 



the siphuncle, X 2. Kingdon's, Shirwell. Barnstaple Athenaeum. 



Oethoceeas Baeumense, n. sp. (Page 30.) 



7. Small fragmentary specimen, showing the ornament, but not very clear signs of the annuli, x 5. 



7 a, lower view. Ironpost, near Dulverton. My Collection. 



8. Larger specimen, showing the annuli and the rate of tapering, X i. 8 «, section of lower end. 



8 5, a portion of its mould, x 10. Frankmarsh. My Collection. 



AcTiNOCEEAs ? (Hueonia) Crickii, n. sp. (Page 33.) 



9. Specimen, probably belonging to this species, wanting the surface, but showing the septa and a 



longitudinal carina, and with signs of longitudinal stri£e. Baggy. Museum of Practical 

 Geology. 



10. Natural section, much decayed, showing the siphuncular arrangement. Locality ? Barnstaple 



Athenaeum. 



11. Another specimen, of which the exterior parts are lost, but in which the siphuncular arrangements 



are preserved in good condition, x |. Barnstaple. Woodwardian Museum. 



12. Another specimen, showing the siphuncular arrangements and retaining the septa. 12 a, portion, 



X 2. 12 b, side view. " Marwood Beds." British Museum. 



CoNTjLAEiA UEFLEXicosTA, Sandberger ? (Page 35.) 



13. A fragmentary specimen, seen from within, x 2. Pilton. Porter Collection. 



Tentaculites conicus, -F. a. Homer. (Page 36.) 



14. Mould of a specimen, x 5. 14 a, cast. 14 b, transverse section. Top Orchard. Barnstaple 



Athenseum. 



Tentaculites (Coleolus ?) tentaculaeis, Phillips, sp. (Page 38.) 



15. A somewhat worn specimen, x 3. Pilton. Porter Collection. 



