. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. [Senate, No. 115 J 11 82 SIXTEENTH KEPORT ON THE CABINET OF NAT. HISTORY. The specimens designated by Mr. Vanuxem the ^^ Retort fiicoid,^^ areclearly parts of the spiral forms already described, but growing irregular-ly so as to give a greater expansion on one side ; or from pressure on theopposite side, that part of the frond has been contracted or crushed. The annexed figure from the Report of Mr. Van
. Annual report of the regents of the university of the state of New York on the condition of the State Cabinet of Natural History and the historical and antiquarian collection annexed thereto. [Senate, No. 115 J 11 82 SIXTEENTH KEPORT ON THE CABINET OF NAT. HISTORY. The specimens designated by Mr. Vanuxem the ^^ Retort fiicoid,^^ areclearly parts of the spiral forms already described, but growing irregular-ly so as to give a greater expansion on one side ; or from pressure on theopposite side, that part of the frond has been contracted or crushed. The annexed figure from the Report of Mr. Vanuxem, when comparedwith those on Plate 2, will show the same or a similar mode of growth. Fig. CONTRIBUTIONS TO PALEONTOLOGY. 83 SPIROPHYTON CRASSUM ( n. s.). PLATE II. FIG. 4. Frond spiral; disc abruptly depressed towards the centre, and lessconcave towards the outer margin. Substance of the frond ridged,radiating from the centre in fasciculi which expand and curvetowards the outer margin, where the surface becomes more even :margin distinctly defined. This is a strong growing species, which attains a large size. In aspecimen about five inches in diameter, the margins of the volutionsare separated by a little more than half an inch of intercalatedstony matter, while the convexity of the volution is nearly an inch. The species occurs in greenish gray shaly sandstone below the Carboni-ferous conglomerate at Cuyahoga falls, Ohio. I have a very similar species from the Chemung group of New-York,which differs in having the ridges or fasciculi more sharply defined uponthe upper surface of the frond, which is nearly flat till within an inch ofthe centre, where it is suddenly depresse
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectscience, bookyear1853
