Appendix A. List of Shells obtained from the “Basement” Clay at Bridlington Quay

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Observation .—The species which are not included in the list of Bridlington Post-Tertiary shells furnished by me to the late Professor Phillips, and published in the third edition of his ‘Geology of Yorkshire,’ p. 274, and which are therefore for the first time recorded, are marked with an asterisk. Among these are five species new to science, which will be now described and figured. In the column after the names of species the letter A. signifies Arctic, Am. American, L. littoral or shallow water ( i.e. under 100 fathoms), D. deep sea (over 100 fathoms), and sp. n. new species. The total number of species in the above list is 83, of which 73 are Arctic, 2 are American, 1 only is deep-water, 5 are new to science, and 3 require confirmation as to their being fossil or recent. With respect to Rissoa costata and R. semistriata , which belong to temperate and southern parts of the North Atlantic, I am not satisfied that they really belong to the glacial bed or deposit above described. Mr. Lamplugh also gives Thracia pubescens from similar beds at Dimlington; if correctly identified, this species is not known as living anywhere north of the south of England. Shell globosely conical, thick, opaque, and rather glossy: sculpture none: colour yellowish brown, whitish about the pillar: spire short, compressed at the apex or point: whorls 4, convex, the last disproportionately large: suture slight: mouth roundish, contracted above and curved below: outer lip hemispherical, with a sharp edge: inner

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