﻿BEITISH FOSSIL CEPHALOPODA. 73 



1853. — Salter, " On a few Genera of Irish Silurian Fossils," Brit. Assoc. Rep. 

 for 1852, p. 59. Lituites hibernicus from Bala Limestone, Kildare, is described as 

 new, but is referred with doubt to the genus Trocholites. 



1853. — Sedgwick, " Geology of the Lake District of Cumberland, Westmore- 

 land, and Lancashire, in letters addressed to W. "Wordsworth, Esq.' On page 97 

 the Cephalopods found in the Silurian rocks of this district are catalogued as Ortho- 

 ceras Jilosum, 0. laqueatum, 0. vagans, 0. subundulatum, 0. tenuicinctum, Cycloceras 

 annulatum, C. ibex, C. subannuhtum, and Lituites cornu-arietis, as from the " Cambrian," 

 and Ortkoceras angulatum, 0. baculiforme, 0. bullatum, 0. dimidiatum, 0. imbricatum, 

 0. laqueatum, 0. subundulatum, 0. tenuicinctum, Cycloceras ibex, C. subannulatum, 

 C. tenuiannulatum, C. tracheale, and Hortolus ibex, as from the " Silurian." 



1854. — Morris, ' A Catalogue of British Fossils,' 2nd edition. The Silurian 

 Cephalopoda enumerated comprise — 3 Actinoceras, being species here first referred to 

 this genus, which was founded on Carboniferous forms ; 3 Cyrtoceras ; 1 1 Lituites, 

 the genera Hortolus and Trocholites not being adopted; 55 Orthoceras, and 10 

 Phragmoceras. 



1858. — Salter, "On a new genus of Cephalopoda, Tretoceras (Orthoceras bi~ 

 siphonatum, Sowerby), and on the occurrence of the genus Ascoceras (Barrande) in 

 Britain," Quart. Journ. Geol. Soc, vol. xiv. p. 177. New details are given about the 

 first-named species, and it is compared to an inturned Gonioceras, and the second 

 species is named A. Barrandei ; both are illustrated by figures. 



1858. — Baily, 'Data and Descriptions to accompany Quarter Sheet 35 N.E. of 

 the Maps of the Geological Survey of Ireland,' records Orthoceras subgregarium 

 and 0. tenuicinctum from Caradoc Limestone, Chair of Kildare. 



1859. — Salter, in a paper by Murchison, "On the Succession of the older Rocks 

 in the northernmost counties of Scotland, with some Observations on the Orkney 

 and Shetland Islands," Quart. Journ. Geol. Soc, vol. xv. p. 374. The Cephalopoda 

 from the Durness Limestone are described as Orthoceras arcuoliratum (Hall), 0. ver- 

 tebrate (Hall), 0. undulo so striatum (Hall), and a new species named 0. mendax. A 

 new genus of remarkable character, referred to the same class, is described under the 

 name of Piloceras, of which there are recognised two species, one only being named 

 as P. invaginatum. All these are figured, as well as a fossil referred to the genus 

 Oncoceras (Hall). 



1859.—' Memoirs of the Geological Survey.' " The South Staffordshire Coalfield," 

 by J. B. Jukes. The fossils are named by Salter, who records Orthoceras annulatum 

 from the Barr Limestone; riiragmoceras pyriforme from the Wenlock Shale ; Ortho- 

 ceras annulatum, with var. fimbriatum, Phragmoceras pyriforme, Lituites cornu-arietis 

 and tortuosus from the Dudley Limestone ; and Orthoceras angulatum, 0. bilineatum, 

 0. annulatum and 0. perelegans, Phragmoceras compressum, Lituites giganteus and 

 L. articulatus, from the Lower Ludlow rocks. 



