No CrossRef data available.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
We use cookies to distinguish you from other users and to provide you with a better experience on our websites. Close this message to accept cookies or find out how to manage your cookie settings.
Published online by Cambridge University Press: 01 May 2009
IV.—Brachymetopus, M‘Coy, 1847.—General form elliptical; head-shield semicircular, and slightly pointed, about one-third wider than long; glabella small, somewhat elevated, one-third the width of the entire shield, and about one-half the length, having a basal lobe on each side, but no short lateral furrows on the glabella; neck-furrow distinctly marked, equal in width to the posterior border of free cheeks; eyes small, smooth, equal to half the length of the glabella; no facial suture visible, only the axal furrow surrounding the glabella and the neck-furrow; free-cheeks slightly convex, nearly twice as long as they are broad, with no visible suture separating them from one another in front of the glabella; margin broad and slightly grooved, angles of cheeks produced posteriorly into spines. The entire surface of the head covered irregularly with a small bead-like ornamentation.
page 536 note 1 M’Coy, Ann. & Mag. Nat. Hist. 1847, vol. xx. p. 230.
page 537 note 1 Report on the Geology of the County of Londonderry, and of parts of Tyrone and Fermanagh (Dnblin, 1843), p. 261.
page 539 note 1 This is not shown in Barrande’s figures of Cheirurus claviger, pl. 40, figs. 1—12, nor in Ch. gibbus, figs. 35—39. but is seen in pi 41, fig. 17; it is also well shown in Triiiucleus ornatus, pi. 29, figs. 1—8, and in Placopaiia Zippei, pl. 29, figs. 30—34; and in Calymene Baylei, pl. 43, fig. 49, and in many others, not referred to by Barrande.