Explanation of Plate IV. 



PAGE. 



Fig. 1. Cytherea Hatchetigbeensis, n. sp., ..... 39 



Fig. 2. Nucula Monroensis, n. sp., 40 



Fig. 3. Panopaea porrectoides, n. sp., 37 



Fig. 4. Solen Lisbonensis, n. sp., . 37 



Fig. 5. Pholadoraya Claibornensis, n. sp., 3S 



Fig. 6. Anomia Lisbonensis, n. sp., 41 



Fig. 7. Astarte Conradi, Dana, 39 



Fig. 8. Pecten (Pleuronectia) Alabamensis, n. sp., .... 40 



*Fig. 9 fee. Pholas alatoidea, n. sp., 3ti 



Fig. 10 a b. Martesia elongata, n. sp., . . . .37 



Fig. 11 a. Cucullaea transversa, Rogers, ...... 40 



Fig. 12 a b. Cardium Hatchetigbeense, n. sp., . . . . .39 



Fig. 13. Cardium Tuomeyi, n. sp., 40 



!: By mistake of the lithographers thi^ tifruiv is uuiuherett 4' instead of 



