240 BRITISH FOSSIL CRUSTACEA. 



is fifteen lines, of which the head is five lines, the thoracico-abdominal segments four lines, 

 the telson six lines, and the greatest breadth of the head is eleven lines, or more than 

 twice as wide as long. 



Localities. — From the Clay-Ironstone of the Coal-measures, Coalbrook Dale ; Dudley; 

 Mansfield, near Nottingham ; Kilmaurs, Scotland. 



Species 3.— BELLINURUS REGINtE :— Baily, 1853. PI. XXXI, fig. 1 a—d. 



Bellinurus REGiNiE, Baily, 1863. Ann. and Mag. Nat. Hist., 3rd ser., vol. xi, 



p. 107, pi. v, figs. 1 a — D. 

 — — Baily, 1863. Quart. Journ. Geol. Soc, 1867, vol. xxiii, pi. i, 



fig. 1. 



Regarding this form Mr. Baily writes : 



" In the explanation of Sheet 137 of the Maps of the Geological Survey of Ireland, I 

 have given a short account of the fossils from the Coal-measures of this district, which 

 includes a notice of these remarkable Crustacea from Bilboa. When I visited this 

 locality I was so fortunate as to obtain a very perfect specimen, since named by me 

 Bettinurus Regina (represented on PI. XXXI, fig. la). 



" On another visit a still more perfect specimen (1 c) was obtained by the gentleman 

 who accompanied me on that occasion, Mr. John Edge, to whom I am indebted for 

 that and the loan of other specimens, which have materially assisted me in drawing up 

 these descriptions. 



" General form broadly ovate, acuminate posteriorly ; axis convex. Cephalic shield 

 three and a half times as broad as long, bow-shaped anteriorly, and surrounded by a 

 narrow and flattened margin; the posterior angles produced into long spines, which are 

 directed outwards ; central portion, or glabella, smooth and moderately convex, of the 

 same breadth as the axis of the thorax at its junction, but decreasing gradually 

 towards the anterior margin. Eyes central, lunate, attached to these divisions. Thoracic 

 rings (somites) five, the lobes of the first twice as broad as the axis, those ■ of the last 

 rather less in breadth than the axis, the lateral lobes extending in a straight line, each 

 being furrowed and terminating in a spine, the length of which diminishes in regular 

 gradation towards the tail ; each of the rings of the axis bears a moderate-sized tubercle. 

 Tail or caudal portion very small, having about three slightly marked divisions on each 

 side, to which is appended or articulated an extremely long spine {tehon), being three 

 times the length of the other portion of the animal, broad at the base, and tapering 

 gradually to a point. 



" The little Crustacean to which I have given the above specific name was found by 

 me in the debris of the same coal-pit which yielded the next species ; it is in a very 

 perfect condition, and exhibits in a remarkable manner the extravagant development 



