236 BRITISH FOSSIL CRUSTACEA. 



The Fossil Limuli of the Coal-measures. 



Much of the materials here noticed was placed in my hands many years since for 

 examination at that time 1 by Professor Prestwich, F.R.S. ; The Broseley Institute ; John 

 Anstice, Esq., of Madeley Wood, Wellington, Salop ; Mr. E. J. Hollier, of Dudley ; Mr. 

 C. Ketley, of Smethwick, near Birmingham ; Mr. J. Farie, of Glasgow ; Mr. Thomas 

 Birtwell, of Gawthorpe Gardens, Padiham, Lancashire, and by other friends. 



After a careful study of the specimens before me in 1866, 1 ventured to propose their 

 division into two well-marked genera : 2 



(a) Those having movable thoracic segments and anchylosed abdominal ones, to be 

 included in the genus Bellinurus. 



(b) Those in which the thoracic and abdominal segments are not divided and in which' 

 the former appear to be anchylosed, to be included in the genus Prestwichia. 



Genus 2. — Bellinurus, 3 Konig. 1820. 



Bellinurus, Kuniff, 1820. Icones Foss. Sect., pi. xviii, fig. 230. 



— Baily, 1863. Ann. and Mag. Nat. Hist., 3rd ser., vol. xi, p. 112. 



— H. Woodw., 1867. Quart. Journ. Geol. Soc, vol. xxiii, p. 32. 



— II. Woodw., 1872. Geol. Mag., vol. ix, p. 439. 

 Entomolithus, Martin, 1809. Petrificata Derbiensia, Wigan, 4to. 



— Parkinson, 1811. Organic Remains, &c, vol. iii, p.* 267, pi. xvii, 



fig. 18. 

 Limulus, Buckland, 1836. Bridgewater Treatise, vol. i, p. 396, and vol. ii, p. 77. 



— Prestwich, 1840. Geol. Trans., 2nd ser., vol. v. 



— Portlock, 1843. Report Geol. Londonderry, p. 316. 

 Bellinurus? McCoy, 1855. Pal. Foss. Woodw. Mus. 



Gen. Char. — General form suborbicular. Plead or cephalic shield semicircular, 

 slightly arched ; the central portion (glabella ?) prominent and declining towards the 

 circumference, surrounded with a flattened margin, and terminating at its posterior 

 angles in long spines. Thoracic division composed of five free and movable segments 

 which terminate in spines and diminish gradually towards the posterior extremity. 

 Abdomen (or caudal portion) small, with indications of three coalesced somites to which 

 is articulated an elongated spine (telson). 



Geological horizon. — Upper Old Red Sandstone and Coal-measures. 



Geographical distribution. — Kiltorcan, Co. Kilkenny, Ireland ; and Coal-measures, 



1 See 'Quart. Journ. Geol. Soc.,' 1867, vol. xxiii, p. 31. 



2 Op. cit., p. 32. 



3 Etym. — BeXos, a dart ; vvpa, a tail. 



