224 PALJEOSTOLOQY OF NEW YORK. 



In 1868 Mr. Billings described 0. Darwini, from the Guelph limestone (Pale- 

 ozoic Fossils). 



Prof. H. D. Rogers published 0. pressum, from the Trenton limestone 

 (Bigsby : Thesaurus Siluricus). 



Mr. Salter published 0. Ommaneyii, from the Niagara group (Bigsby : Thesau- 

 rus Siluricus). 



Prof. C. F. Hartt published 0. laqueatum [not 0. laqueatum, Hall, 184 7] (Aca- 

 dian Geology). 



Prof. Dawson described O. dolalum, 0. perstrictum (not 0. perstrictum, Bar- 

 rande), 0. Vindobonense, Actinoceras inops, and cites 0. laterale, Phil., from the 

 Carboniferous system ; republishing 0. elegantulum, 0. exornatum, Daw., and 0. 

 punrtostriatum, Hall, from the Upper Silurian. He also cites, on the authority 

 of Mr. Salter and Dr. Honeyman, 0. nummulare, 0. Ibex and doubtfully 0. bulla- 

 tum Sow., from the Upper Silurian of Arisaig (Acadian Geology). 



In 1869 Mr. J. M. Safford described O. capitolinum and indicated 0. Foxense 

 (not defined), from the Trenton group (Geol. of Tenn.). 



M. Barrande described 0. Clouei, O. recedens, Endoceras Atlanticum, E. insulare 

 and E Marcoui, from the Quebec group ; and Huronia minuens, from the Clinton 

 group (Syst. Sil. du centre de la Bohime). 



In 1872 Mr. Meek described 0. Ortoni, from the Cincinnati = Hudson-river 

 group (Proc. Acad. Nat. Sci. Phila.). 



In 1874 M. Barrande described Huronia Romingeri (Syst. Sil. du centre de la 

 Bohime). 



Mr C. A. White described 0. colon, from the Quebec group (Rep. Invert. 

 Foss. U. S. Geol. Survey). 



In 1875 Mr. Billings described 0. Anax, from the Upper Helderberg lime- 

 stone (Canad. Nat. and Geol.). 



II all and Whitfield described 0. Carleyi, 0. Duseri and 0. turbidum, from 

 the Hudson-river group ; 0. Jamesi, from the Clinton group ; and 0. Strix, from 

 the Niagara group (Geolog. Surv. Ohio: Pal. vol. 2). 



M r. S. A. Miller described O. Byrnesi, 0. Cincinnatiense, 0. Dyeri, 0. Fosleri, 0. 

 Haiti (= Hallanum, M., 1877), O. Harperi, 0. Meeki, 0. Mohri and 0. transversum, 

 from the Cincinnati group = Hudson-river group (Cin. Quart. Jour. Sci., vol. 2). 



