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BRITISH FOSSIL CEPHALOPODA. 75 



1863. — Salter, 'Explanation of Sheets 160, 161, 171, and part of 172, of the 

 Geological Survey of Ireland,' records Orthoceras annulatum from Croaghmashin ; 

 and Baily, 0. angulatum and 0. subundulatum from Derrymore Glen. 



1865. — Harkness, " On the Lower Silurian Rocks of the South-east of Cumber- 

 land and the North-east of Westmoreland," Quart. Journ. Geol. Soc, vol. xxi. p. 235, 

 records Orthoceras Brongniarti from the Dufton Shales, and O.politum and 0. vagans 

 from the Keisley Limestone. 



1865. — Haswell, " On the Silurian Formation of the Pentland Hills." Printed 

 from a paper read before the Geological Society of Edinburgh. In this book the 

 author describes the Cephalopods found in the above-named district under the names 

 of Orthoceras politum, 0. Maclareni, 0. tenuiannulatum, and 0. subundulatum, and 

 illustrates them by figures. 



1865. — D. C. Davies, " List of Fossils described from the Bala Limestone, and 

 its associated Beds in North Wales." Abstract of Proceedings of the Liverpool 

 Geological Society, Session VI. The fossils enumerated are Orthoceras politum, 

 0. subundulatum, 0. vagans, 0. ventricosum, 0. annulatum, Phragmoceras arcuatum, 

 Lituites cornu-arietis, and L. anguiformis. 



1865.— Baily, 'Explanatory Memoir to Sheets 167, 168, 178, and 179, of the 

 Geological Survey of Ireland,' records Cyrtoceras incequiseptum, Orthoceras Brongniarti, 

 and 0. tenuicinctum, from the Lower Silurian of co. Waterford. 



1866. — Salter, 'Appendix to Yol. III. of the Memoirs of the Geological Survey 

 of Great Britain :' " The Geology of North Wales," by A. C. Ramsay. He records 

 the various Cephalopoda found in the rocks in the district, which are too numerous 

 to enumerate here ; none of them are new introductions except those to be mentioned 

 below. The new species described and figured are Orthoceras sericeum and Cyrtoceras 

 prcecox, from the Tremadoc Slates ; Orthoceras encrinale and 0. Avelinii, from the 

 Llandeilo Flags ; Cyrtoceras sonax and C. atramcntarium, and Orthoceras audax, from 

 Bala Limestone ; from which rock also illustrations are given of Orthoceras vagans 

 and Lituites planorbiformis. 



1866. — R. Harkness and H. Nicholson, "Additional Observations on the 

 Geology of the Lake Country," Quart. Journ. Geol. Soc, vol. xxii. p. 480, record 

 Orthoceras Jilosum, 0. tenuicinctum, and 0. subannulatum, from Coniston Flags. 



1866. — Wyatt Edgell, "On a Species of Lichas and other new Forms from 

 the Llandeilo Flags," Geological Magazine, vol. iii, p. 160, records from these 

 beds Orthoceras subundulatum and Endoceras eoum, the latter being new, but the 

 name is unaccompanied by any figure or description. 



1866. — Morton, " On the Geology of the Country bordering on the Mersey and 

 on the Dee," Liverpool Naturalists' Journal, No. 1, records Orthoceras primosvum, 

 from the Wenlock Shales. 



1867. — Hughes, " On the Break between the Upper and Lower Silurian Rocks 



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