Descriptions of Gasteropoda, chiefly in Mrs. Robert Gray's Collection, from the Ordovician and Lower Silurian of Girvan

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Abstract
Since this contribution to the knowledge of the more ancient Palæozoic gasteropoda is primarily concerned with those from the Girvan district, contained in Mrs. Gray's magnificent collection, reference is made to others only where they afford further information concerning structure or distribution. Forty-one forms are dealt with, seven of which have been described and one named in MS. by previous authors. Twenty-four species and one variety from the same district were described and figured by me in papers read before this Society in the years 1899, 1902, 1905, and 1906. Of these twenty-one species and a variety belong to genera referred to the Pleurotomariidæ; and now twenty-five species and a variety are added to this number. I am following Dr. E. O. Ulrich in his classification of the family, only making exception in the case of Omospira . He considers this genus more akin to Raphistoma Hall. It is, however, distinguished by having a sinus in the outer lip at the periphery, also a band on most of the whorls; this latter is never present in Raphistoma according to Hall, and also according to Dr. Ulrich himself. So far, I have not met with any specimens bearing the characteristics of Raphistoma sensu stricto in the Scottish Ordovician. The internal moulds of certain forms have been mistaken for that genus; but, where the structure is preserved, as will be pointed out, there can be no doubt that they belong to Liospira Ulrich. In what degree these ancient forms are really related one

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