﻿70 BEITISH FOSSIL CEPHALOPODA. 



He also describes a Theca as Orthoceras triangular 'e ; and founds a new genus, 

 Koleoceras, for certain Orthocerata, with some spongeous or hydroid overgrowth, 

 which he believed to be part of their organisation. The species ranged under this 

 generic title, pseudo-regular e, pseudo-speciosum, and Ballii, can all be placed among 

 those named above. The larger number of his specimens are very fragmentary, 

 and comparatively few of his names are now of value. 



1844. — E. Griffiths, in the ' Report of the British Association for 1843,' in a 

 paper " On the Red Sandstone, Devonian, and Silurian districts of Ireland," records 

 Orthoceras imbricatum (Wahl.), from Egool. 



1845.- — In the Report of the same Association for 1844, in a paper " On certain 

 Silurian districts in Ireland," the same author records 0. gregarium, tenuicinctum, 

 virgatum, an&Jilosum, from Ballinahinch, Tonlegee, and Tullyconnor. 



1845. — Sedgwick, "On the older Palasozoic (Protozoic) Rocks of North Wales," 

 Quart. Journ. G-eol. Soc, vol. i. p. 5. Salter supplies the list of fossils, and records, 

 without describing, Nautilus primcevus, subsequently recognised by the same author 

 as Trocholites planorbiformis (Conrad); also Lituites comu-arietis, from the Bala Beds. 



1845. — Forbes, "On Two Species of Creseis ? collected by Prof. Sedgwick," 

 Quart. Journ. G-eol. Soc, vol. i. p. 145. These are named C. primceva and 

 C. Sedgwickii. They have subsequently been ascertained to be Orthocerata, and the 

 former to be new. They are from the Upper Silurian. 



1845. — Sedgwick, " On the comparative Classification of the fossiliferous Strata 

 of North Wales, and the corresponding Deposits of Cumberland, Westmoreland, and 

 Lancashire," Quart. Journ. Geol. Soc, vol. i. p. 445. In this are recorded Lituites 

 comu-arietis from the Coniston Limestone, and Orthoceras ibex from the Ireleth Slates. 



1846. — Sharpe, " Contributions to the Geology of North Wales," Quart. Journ. 

 Geol. Soc, vol. ii. p. 283. In PI. 13, figs. 2, 3, he figures Creseis primosva (Forbes), 

 and C. ventricosa, from Upper Silurian. Both these have been subsequently recog- 

 nised to be Orthocerata. 



1846. — M'Cot, 'A Synopsis of the Silurian Fossils of Ireland.' In this work 

 the Orthocerata, thought to be identified with previously described ones, are referred 

 to under the names of Orthoceras acuarium (Miinst.), approxiraatum (Sow.), breviconi- 

 cwm (Portl.), bullatum (Sow.), elongatocinctum (Portl.), jilosum (Sow.), gregarium (Sow.), 

 ibex (Sow.), imbricatum (Wahl.), lineare (Miinst.), lineatum (His.), regulare (Schl.), 

 semipartitum (Sow.), striato-punctatum (Miinst.), subundulatum (Portl.), tenuicinctum 

 (Portl.), tumidum (Portl.). The localities of these species are given, but not their 

 geological position. How far the names here given can be adopted, will be seen in 

 the present work. M'Coy also describes as new species Orthoceras coralliforme 

 (PI. I. fig. 3) from co. Galway, 0. subgregarium (fig. 4) from Leenane, and Poterio- 

 ceras approximatum (fig. 5) from Tyrone. The last-named genus had already been 

 established by M'Coy, in his ' Synopsis of the Carboniferous Fossils of Ireland.' 



