108 Mr. W. H. Baily on some Coal-measure Crustacea. 



by him Belinurus belhdus*; previous to this, Martin f gave a 

 figure and short description of this species, which he called En- 

 tomolithus monoculites ? (lunatus), including it with Trilobites 

 under the same generic term of Entomolithus, a name which 

 would therefore, according to the rules of nomenclature, be in- 

 admissible. Parkinson % figures a similar fossil from iron- 

 stone found in the Coal-measures of Dudley, which he includes 

 with the Trilobites, stating at the same time that it appeared to 

 be identical with that described by Martin. The same species 

 is figured and noticed by Dr. Buckland under the name of 

 Limidus trilobitoides§, and afterwards by Mr. Prestwich, in his 

 paper on the Geology of Coalbrook Dale, who adopts the same 

 name, giving a figure of this and other species belonging to 

 the genus, from the Ironstone found in the Coal-measures of 

 Coalbrook Dale||. Lastly, General Portlock figures a specimen, 

 said to be from Carboniferous shale (most probably, however, 

 Coal-measures), Maghera, co. Deny, which he doubtfully refers 

 to the same species^. 



Prof. Morris, in his Catalogue of British Fossils, ed. 2, 1854, 

 cites all the above authorities, except Parkinson, referring the 

 same species to Limidus trilobitoides, Buckland. 



In a paper read by me before the Geological Society of Dublin** 

 a description was given of a specimen (the only one then ob- 

 tained) from Bilboa Colliery, Queen's County, t discovered by 

 Mr. G. H. Kinahan, of the Geological Survey of Ireland, in 

 debris derived from the three-foot bed of shale immediately over 

 the Coal No. III. of the section, Castlecomer district. The 

 accompanying fossils in the same bed of shale were a few scat- 

 tered plant-remains and numerous small bivalve Unio-like shells 

 (probably Myacites), and others of a Mytiloid form, which may 

 be referred to Myalina. In this paper some remarks were offered 

 on the allied species from Coalbrook Dale, which had been in- 

 cluded with it in the genus Limulus ; and it was proposed, from 

 the characteristic differences they presented, and their greater 

 affinity with the Trilobites, to remove all these Coal-measure 

 Crustacea from that genus, and group them into a new one, 

 under the name of Steropis. Since then, more complete speci- 

 mens have been obtained from Bilboa Colliery, which have 



* Icones Fossilium seetiles, by Charles Konig, 1820, pi. 18. fig. 230. 

 t Petrificata Derbiensia, 1809, pi. 45. lig. 4. 

 X Organic Remains, 1811, vol. hi. p. 2/4, pi. 17. fig. 18. 

 § Bridgewater Treatise, 1836, p. 396, vol. i., & vol. ii. p. 77, t. 46". fig. 3. 

 || Trans, of Geol. Soc. of London, ser. 2. 1840, vol. v. pi. 41. fig. 8. 

 IT Report on the Geology of Londonderry and Tyrone, 1843, p. 316, 

 pi. 24. hg. 11. 

 ** Journal of the Geological Society of Dublin, 1858, vol. viii. p. 89. 



