Crustacea. ] DEVONIAN ARTICULATA. 179 
Genus. BRONTEUS (Gold.) 
Gen. Char.—Oval, flat; Cephalic shield, outline unknown; glabella depressed ovate, widest in front, 
three segmental furrows the most anterior farthest apart; eye-line as in Asaphus, proceeding upwards from 
the middle of each side of the posterior margin, with a short sigmoidal curve to the eye-lobe, and thence 
curving inwards and forwards to the front; thoraw of ten segments, the axal lobe equalling the lateral 
lobes in width; lateral lobes flat without facets, bent backwards at the tip, no pleural groove ; pygidium 
semiorbicular, with a flattened entire margin, axal lobe very short of one joint, but the axal sulci pro- 
longed towards the margin, but not joined at their extremities, lateral folds broad, not reaching the margin. 
This genus by the number of body-rings &c. forms the passage to the Asaphide; still in its flat pleure, and 
want of facets and contractile power, it clearly belongs to the present group though aberrant in its characters 
towards the Asaphinw. 
BRONTEUS ALUTACEUS (G‘d/d.) 
Syn. and Ref—Leonhard and Bronn’s Jahrb, 1843, t. 6. f. 1. (Bronteus flabellifer Gold. Phill. Pal. 
Foss. t. 57. f. 254. not of Gold.) 
Sp. Ch.—Pygidium semi-elliptical, anterior margin on each side convex; length (of small specimen) 
ten lines, width one inch two lines; axal lobe tumid, triangular, of two joints, the anterior very narrow, 
ring-shaped, length of both together two lines, width three and half lines; margin radiated with fifteen 
broad, depressed ribs, separated by narrow sulci, which vanish before reaching the edge; surface with 
obtuse granules, about their diameter apart, about three in the space of one line; general surface gently 
convex in the middle portion, becoming gradually concave towards the margin, which is flattened or 
slightly elevated. 
I have only seen the tail, which is often one and half inch long. The granulation is sometimes very 
obseure, at others very distinct. 
Position and Locality—Common in the Devonian limestone of Newton Bushel. 
