. Annual report. New York State Museum; Science; Science. 25O NEW YORK STATE MUSEUM itive expression and that here concerned an intermediate stage. Regarding the last named this condition is evinced in a usually greater thickening of the hinge plate than prevails in Beachia, and a less strong development of the muscular scars than in M. ova1i s . B. suessana is an Oriskany species of the Cumberland basin, Maryland. The specimen which has been identified therewith in the Oriskany at Rondout is familiar to the writer but there is no particular reason for assigning it to Beachia rather than to Me
. Annual report. New York State Museum; Science; Science. 25O NEW YORK STATE MUSEUM itive expression and that here concerned an intermediate stage. Regarding the last named this condition is evinced in a usually greater thickening of the hinge plate than prevails in Beachia, and a less strong development of the muscular scars than in M. ova1i s . B. suessana is an Oriskany species of the Cumberland basin, Maryland. The specimen which has been identified therewith in the Oriskany at Rondout is familiar to the writer but there is no particular reason for assigning it to Beachia rather than to Meg- alanteris. The simplest expression of these shells is therefore the most southerly. For the sake of an expression therefore the term applied to this species will serve. It is evident that the generic distinction be- tween Beachia and Megalanteris is a fugitive one and of little value. Probably it will be found wise to withdraw the former term altogether and express the relations here indicated by specific terms which are even then too exacting. It is not a matter of record that these species have the same character of brachial processes but specimens are before me from the Glenerie Oriskany which show this to be the case. Lower Devonic. Grande Greve and Perce rock, P. Q. Megalanteris thunii now Shells having the aspect of M. o v a 1 i s Hall often with more convex ventral valve and distinguished chiefly by numerous gen- /. 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 Museum. Albany : University of the State of New York
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