Memoir Volume 9, PT. 1 (Paperback)

This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1908 edition. Excerpt: ...is an indication of arrest of development. Localities. Along the shores at Grande Greve and at Perce. Avicula textilis Hall. Palaeontology of New York. 1859. 3:288, pl. 52, fig. 9, lo; pl. 53, fig 2, 3, 5, 7, 10 Pterin ea textilis? Billings. Palaeozoic Fossils. 1874. v. 2, pt 1, pl. 4, fig. 1 Mr Billings hesitatingly referred to this species a specimen of which he gave a figure but to which no reference was made in his text. Its association on the plate with Gaspe fossils and the actual occurrence of the species therewith leads to the inference that his specimen was from these limestones. The shell is very abundant here and not to be distinguished from the New York forms occurring in the New Scotland (Helderbergian) fauna, except that by virtue of different preservation the former show more distinctly the character of the surface ornament which consist of primary ribs separated by broad interspaces usually divided by a single intermediate rib of small size. This simple ornament prevails over the adult body, but the intercalary spaces become broken up toward the margin in old shells, showing thereby a tendency to the finer alternating surface of A. com m u n IS Hall, a common Oriskany species at Becraft mountain. Localitz'es. About Grande Greve and elsewhere on the Forillon. Pterinopecten proteus Clarke zmzlation Plate 19, figures 2. 3 See Pterinopect e n proteu s Clarke. N. Y. State Mus. 'Mem. 3. 1900. p. 32, pl. 4, fig. 4-8 The group of shells represented by the Oriskany species A c t i n o p teria (Avicula) textilis and var. arenaria Hall, Pterinopecten (Avicula) recticosta Hall and Pt. proteus Clarke, find allied' expression in the fauna of the Gaspe limestones in at least three species. In all these there...