1863.] CTJELET GEAVEL OF LUDLOW, ETC. 175 



Lyelli from the Lower Carboniferous Limestone of Nova Scotia, I have 

 reluctantly been obliged to place M. de Verneuil's species among the 

 synonyms of P. Cora, the latter name (as may be seen by the list 

 of synonyms above given) claiming three years' priority. All the 

 Nova-Scotian specimens I have been able to examine were small, not 

 exceeding about 11 lines in length by some 12 or 13 in width. But it 

 must be remembered that, as a general rule, the Nova-Scotian species 

 and specimens, although adult, are small, and in this respect are 

 exactly similar to those we find in Scotland. The surface is covered 

 with numerous longitudinal, straight, or slightly flexuous, narrow, 

 thread-like, rounded striae, with sulci, or interspaces, of rather less 

 width ; smaller striae are also here and there intercalated between the 

 larger ones. The ribs are also regularly and closely crossed by small 

 concentric lines. 



P. Cora is a widely spread Carboniferous species, having been found 

 in many parts of America, India, Europe, &c. 



Sir C. Lyell found this shell at Windsor, Horton Bluff, Shubena- 

 cadie, Gay's Biver, Minudie, and Cape Breton, in Nova Scotia. Dr. 

 Dawson states that it occurs almost everywhere — at Pugwash, on the 

 eastern coast of Cumberland, at Lennox Passage, M'Kenzie's Mill at 

 the eastern extremity of Wallace Harbour, &c. 



EXPLANATION OF PLATE IX. 



Figs. 1,2, 3. Terebratula saccuhcs, Martin. 



„ 4, 5. Athyris subtilita, Hall. 



,, 6. Spiriferina cristata, Schlotheim. 



,, 7, 8. Spirifera acuticostata, De Koninck. 



,, 9, 10. Spirifera glabra, Martin. 



„ 11,12. Camarophoria ? globulina?, Phillips. 



„ 13, 14. Bhynchonella Dawsoniana, n. sp. ? 



„ 15. Bhynchonella (undeterminable). 



„ 16. Bhynchonella Acadiensis, n. sp. ? 



„ 17. BhyncJwnella (undeterminable). 



„ 18. Strophomena analoga, Phillips. 



„ 19. Streptorhynchus crenistria, Phillips. 



,, 20,21. Productus semireticulatus, Martin. 



„ 22, 23. Productus Cora, D'Orbigny. 



2. On the Gravels and other Superficial Deposits of Ludlow, 

 Hereford, and Skiptojst. By T. Curlet, Esq., C.E., P.G.S. 



The plans and geological sections which I have now the honour to 

 lay before the Geological Society are those of three towns recently 

 drained by me, namely, Ludlow, Hereford, and Skipton. 



Ludlow. — The Upper Ludlow rocks are, in my opinion, thrown up 

 against the Old Bed Sandstone by a fault running east and west, and 

 taking the line of the Old Town ditch, below the Church and the Castle, 

 as marked on the plan (p. 177). The relations of the intermediate 

 " passage-beds," which connect the Silurian and Old Bed systems, 

 and are so well developed in the immediate neighbourhood of the 



