. Bulletin - New York State Museum. Science. SOME NEW DEVONIC FOSSILS 289 and distant concentric lines which are mostly continuous though somewhat undulated but these frequently inosculate and become separated by narrower intervals toward the anterior margin. Length 17 mm, greatest diameter 13 mm. This shell is like L. p e r 1 a t a Hall and L. spatiosa Hall of the Helderbergian as the outline of those species has been rep- resented but in this respect conjoined with the peculiar character of its surface markings, I am unfamiliar with any other species, like it. Lozver Devonic. Grande Greve, P
. Bulletin - New York State Museum. Science. SOME NEW DEVONIC FOSSILS 289 and distant concentric lines which are mostly continuous though somewhat undulated but these frequently inosculate and become separated by narrower intervals toward the anterior margin. Length 17 mm, greatest diameter 13 mm. This shell is like L. p e r 1 a t a Hall and L. spatiosa Hall of the Helderbergian as the outline of those species has been rep- resented but in this respect conjoined with the peculiar character of its surface markings, I am unfamiliar with any other species, like it. Lozver Devonic. Grande Greve, P. Q. BRYOZOANS Hederella blainvillii sp. no v. This very interesting bryozoan incrusts the shells of L e p t o s - trophia blainvillii Billings and, so far as our observation has extended, seems to attach itself always to the ventral or upper valve at an early stage in the life of the brachiopod and grow out-. Hederella blainvillii ward from the parent cell in all directions, keeping the apertures, of the cells at or just a little distance above the margins of the shell. This habit evinces a true commensal condition not often shown in other cases of attached bryozoa; the water currents set up by the ciliated mantle of the brachiopod have helped to feed the members of the bryozoan colony, most of which stand in an attitude of readi- ness for this service. This species occurs with extraordinary fre- quency on these brachiopod shells and seems to grow on no other save for an occasional simply branched stock on an upper valve of Chonetes hudsonicus. Hederella ramea which I have described from the Oriskany of Becraft mountain, N. Y. elects attachment to Leptostrophia oriskania, always keeping its apertures toward the opening of the shell valves. From. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original New York State
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