Report on the Irish D I A T O M A C E Ae (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1875 Excerpt: ...produced at the ends; marginal plates relatively broad; attenuated at "the ends; space included between the inner margins narrow; slightly expanded at the ends; striae fine, linear; slightly radiate. (PI. 29, fig. 12.) This form varies greatly in size and shape, as well as in the habitat. It seems essentially a fresh water form, for I have found it frequently in localities far remote from marine influences; and also in places where, so far as I could judge, there was no likelihood of mixture of fresh water with the salt. Under the circumstances, I was anxious to submit the forms to the most rigid examination, but could detect no specific difference between them. Grunow observes that, in the specimen that came under his notice, there was even a tolerably wide transversely expanded central nodule, which he considers should be established as the characteristic distinction between this species and Mastogloia lanccolata. I may mention that this feature, though frequently noticeable, is not of universal occurrence. "Wm. Sm., B.D., Vol. ii., p. 65, PI. liv., fig. 341. Ealfs, in Pritch., p. 925. Grunow, Verhand. der K. K. Zool. Bot. Gesel., Band x., 1860, p. 575, T. vii., fig. 11. Eab. Fl. Eur., sect. 1, p. 261. Clcve, Om Svenska och Norska Diat., p. 230. Tacumshane, Co. "Wexford. Lough Gill, Co. Kerry. Kilcool, Co. "Wicklow. Ncwtownlimavady, Co. Deny. In all which gatherings there was a mixture of fresh and brackish forms. Tide pool, Greystoncs, Co. "Wicklow, where the forms were mostly marine. Lough Corrib, Co. Galway, wholly free from marine influence. Var. capitata, ("Wm. Sm.) Fresh water. Agreeing with the typical form, only that the produced ends are capitate; the striae, also, which are similarly arranged, may easily be resolved...