PLATE II. 
CoNOOABDiUM CLATHEATUM, (TOrUgny. (Page 18.) 
Fig. 
1. Large and flattish specimen. 1 a, anterior view. 1 h, upper view. 1 c, portion of surface 
enlarged. (^The strice are here represented too close.) Lummaton or Barton. Torquay Museum. 
2. Left valve of a very broad specimen, with very strongly marked median keel, and very coarse 
transverse striae. 2 a, portion of surface enlarged. Barton. Torquay Museum. 
3. A similar but smaller and less perfect specimen. Lummaton. British Museum. 
CoNOCAEDiUM PTXGNANS, WMdhome, sp. (Page 24.) 
4. An almost perfect specimen. 4 a, anterior view. 4 &, upper view. 4 c, portion of posterior 
side enlai'ged, showing the very fine striae. Lummaton. My Collection. 
5. Another and more transverse specimen. 5 a, anterior view. Lummaton. My Collection, 
CoNOCAEDiUM HYSTEEicuM, Schlotheivi, sp. (Page 26.) 
6. Specimen showing the large smooth ribs and wide posterior gape. 6 a, upper view, showing the 
great depth of the shell. 6 b, anterior view. Chudleigh. Vicary Collection. 
7. Another worn but very globose specimen, showing the convex hinge-margin. This specimen is 
almost exactly like Schlotheim's original figure. 7 a, upper view. Chudleigh. Vicary 
Collection. 
CoNOCAEDiuM ViLLMAEENSE, d' ArcMac and de Verneuil, sp. (Page 28.) 
8. Large transverse specimen. 8 a, anterior view, showing the small and defined concave anterior 
slope. 8 h, upper view. 8 c, portion of the surface of the back enlarged. Lummaton. My 
Collection. 
9. Smaller and less transverse specimen. Lummaton. My Collection. 
CoNOCAEDiUM PEATEE, n. sp. (Page 30.) 
10. Specimen showing the very fine ornament, the large anterior slope, and prominent umbones. 
10 a, portion of surface of dorsal region enlarged. Lummaton. My Collection. 
IsocAEDiA Ceokeei, n. sp. (Page 15.) 
11. Eight valve, showing its large and convex anterior side. 11 a, upper view, showing the lanceolate 
truncated escutcheon. Wolborough. Vicary Collection. 
Mecynodon coltjmbinus, Whidborne, sp. (Page 33.) 
12. Perfect specimen with very lofty keel. 12 a, upper view, showing the posterior elongation of 
the keel. Chudleigh. Vicary Collection. 
13. Left valve of another perfect specimen. 13 a, inner view, showing hinge, pedal impression, 
posterior muscle-mark, and pallial line. Chudleigh. Vicary Collection. 
14. Much larger but less perfect specimen, showing the umbo overhanging the anterior side. Chud- 
leigh. Vicary Collection. 
Mecynodon caeinattjs, Goldfuss, sp. (Page 34.) 
15. Left valve of a very aged specimen, showing the contour of the keel. 15 a, upper view, showing 
the very great concavity of the escutcheon. 15 b, inner view, showing the concave hinge-liue. 
" Wolborough " (?). Museum of Practical Greology. 
