﻿BRITISH FOSSIL CEPHALOPODA. 71 



He proves in the work under notice that the Koleoceras of Portlock is formed by 

 a parasite which he thinks allied to Halichondria ; in the case of Koleoceras Ballii it 

 is actually not growing on a Cephalopod at all, but on a Murchisonia. He also 

 records a number of Bellerophons as Cephalopods allied to the Argonaut. 



1848. — ' Memoirs of the Geological Survey of Great Britain,' vol. ii. part i. 

 This is a memoir by Prof. J. Phillips on " The Malvern Hills compared with the 

 Palseozoic districts of Abberley, &c." In it are recorded the localities of numerous 

 Cephalopods previously described, and in the appendix by J. Phillips and J. W. 

 Salter descriptions are given of Lituites undosus (Sow.) and Orthoceras Brightii 

 (Sow.) ; while the first-named author figures and describes as new 0. marloense 

 (PL XIII. fig. 1) and 0. textile (figs. 5, 6), and the last-named describes 0. perelegans 

 (figs. 2, 3, 4), and makes some remarks on the characters of the genus Lituites. 



1849. — Salter, in a paper by Mr. Sharpe, " On the Geology of the Neigh- 

 bourhood of Oporto, including the Silurian Coal and Slates of Yallongo," Quart. 

 Journ. Geol. Soc, vol. v. p. 142, founds the species Orthoceras vagans, and figures it 

 from Spanish specimens, but states at the same time that it is abundant in the Lower 

 Silurian rocks of Wales and Westmoreland. 



1849. — D'Orbigny, 'Prodrome de Paleontologie stratigraphique.' He sepa- 

 rates Lituites cornu-arietis, var. (/3) of Sowerby, from var. (a), under the name of 

 L. Sowerbianus. He gives the name of Orthoceras subconicum to the species described 

 by Sowerby in the Silurian system as 0. conicum, the name being pre-occupied by 

 Hisinger ; that of 0. subdimidiatum to the 0. dimidiatum of Sowerby, the name being 

 pre-occupied by Miinster ; that of 0. subattenuatum to the 0. attenuatum of Sowerby, 

 the name being pre-occupied by Fleming. 



1851. — M'Cot, " On some new Silurian Mollusca," Annals and Mag. of Nat. 

 Hist., Ser. II., vol. vii. p. 45. The author separates one of the figures (fig. 19 j of 

 Sowerby's Gomphoceras pyriforme as Poterioceras ellipticum, and one of Phragmoceras 

 arcuatum (fig. 1) as P. intermedium. He also describes as new Cycloceras tenui- 

 annulatum from the Upper Silurian, and Orthoceras politum from the Lower Silurian. 

 Cycloceras was founded as a subgenus in his ' Synopsis of the Carboniferous Fossils 

 of Ireland.' 



1851. — Harkness, " On the Silurian Rocks of Dumfriesshire and Kirkcud- 

 brightshire," Quart. Journ. Geol. Soc, vol. vii. p. 46, records Orthoceras Sedgwichii, 

 annulatum, and tenuicinctum, from Kirkcudbrightshire. 



1851. — Salter, in a paper by Murchison, " On the Silurian Rocks of the South 

 of Scotland," Quart. Journ. Geol. Soc, vol. vii. p. 137, gives a figure and description 

 of a new species — Orthoceras Barrandei ; also figures of 0. politum (M'Coy) and 

 0. vaginatum (Schl.), and records in addition 0. angulatum (Wahl.) and 0. cala- 

 miteum (Miinst.). 



1851. — Sedgwick, "On the Geological Structure and Relations of the Frontier 



