File:Geological magazine (1891) (14798114473).jpg

Identifier: geologicalmagazi381891wood (find matches)
Title: Geological magazine
Year: 1864 (1860s)
Authors: Woodward, Henry, 1832-1921
Subjects: Geology
Publisher: London (etc.) Cambridge University Press
Contributing Library: Smithsonian Libraries
Digitizing Sponsor: Smithsonian Libraries

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ic alteration in chemical compounds previously formed asmight complete their individuality qua minerals. This being so, I may be allowed to repeat my thanks to Mr.Hutchings for his most valuable contributions of facts, the fullvalue and bearing of which will perhaps be better seen, when thepresent acute stage shall have passed of that pressure on thebrain, under which English petrology would seem at present to besuffering.Wellington College, Berks, A. Irving. 4tth April, 1891. nynisozEiLXiJLn^iEiOTJS. Discovery of Lower Silurian Fishes.—At the meeting of theBiological Society of Washington, on February 7th, 1891, Mr.Chas. D. Walcott, of the United States Geological Survey, announcedthe discoveiy of numerous dermal plates apparently of fishes in aformation believed to be of Trenton age, near Cafion City, Colorado.Mr. Walcott contemplates presenting a full account of the subject tothe Geological Society of America at their forthcoming meeting inWashington in August next. a ^ I 2, f? o
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THE GEOLOGICAL MAGAZINE. NEW SERIES. DECADE ill. VOL. VIII. No. VI.—JUNE, 1891. o:Eixo-xisrj^iLi ^^leTXOLiES. I.—The Gigantio Ceratopsid^, or Horned Dinosaurs, of North America.^ (PAET II., continued from p. 199.)By Prof. 0. C. Marsh, Ph.D., LL.D., F.G.S., etc. The Scapular Arch and Fore Limbs.—The scapula is massive,especially below. The shaft is long and narrow, with a thin edgein front, and a thick posterior margin above the glenoid fossa. Thedistal portion has a median external ridge, and a thick end (Wood-cut, p. 242, Fig. l,sc.). The coracoid is rather small, and in old individuals may becomeunited to the scapula. It is sub-rhombic in outline, and is perforatedby a large and well-defined foramen. No indications of a sternumhave yet been found in this group (Woodcut, Fig. 1, cr.). The humerus (Fig. 2) is large and robust, and similar in formto that of Stegosaurus. It is nearly as long as the femur in oneindividual, proving that the animal walked on all four feet. Theradius

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