. The Canadian naturalist and geologist. Natural history -- Periodicals. 1864.] DAWSON ON THE GENUS RUSOPHYCUS. 363 ON THE FOSSILS OF THE GENUS KUSOPHYCUS. By J. W. Dawsox, , , &c. The genus Rusopliyciis was established by Prof. Hall for certain transversely wrinkled impressions found in the Clinton group of Oneida County, New York, and supposed to be fossil sea-weeds. Objects of similar appearance have been detected by Mr. Billings in the Chazy sandstone of Grenville, and described by him under the name of R. GrenviUensis. They much resemble one of Prof. Hall's species, R. bilo
. The Canadian naturalist and geologist. Natural history -- Periodicals. 1864.] DAWSON ON THE GENUS RUSOPHYCUS. 363 ON THE FOSSILS OF THE GENUS KUSOPHYCUS. By J. W. Dawsox, , , &c. The genus Rusopliyciis was established by Prof. Hall for certain transversely wrinkled impressions found in the Clinton group of Oneida County, New York, and supposed to be fossil sea-weeds. Objects of similar appearance have been detected by Mr. Billings in the Chazy sandstone of Grenville, and described by him under the name of R. GrenviUensis. They much resemble one of Prof. Hall's species, R. bilobatus, which is the type of short bilobate forms included in the genus. Similar markings, but of much smaller size, occur in the Lower Carboniferous of Nova Scotia, and have been described and figured by the writer as prob- ably casts of the lower extremities of worm-burrows, in the Journal of the Geological Society of London^ vol. xiv, p. 74. In the 12th volume of the same journal, Mr. Salter had described small bilobate impressions, not striated transversely, from the Longmynd rocks of England, under the name Arenicolites didpna. He supposed them to be burrows of Fig. 1. Rusophycus GrenviUensis, var. a, half nat. size. I had an opportunity last summer, in company with Mr. J. A. Bothwell, B. A., to examine the locality of th e Grenville specimens, and found them to be quite abundant in certain layers of sand- stone alternating with shale on the bank of the Grenville canal. The facts obtained from their study in place enable me to throw some light on their probable nature, and possibly to rescue them. 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 Natural History Society of Montreal. Montreal, Dawson
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