46 CARBONIFEROUS TRILOBITES. 



PI. Ill, figs. 1 — 8), and also in the 'Geological Magazine' (Decade ii, vol. x, p. 

 450), and acting on the evidence of the age (Devonian), and the published 

 figure of Schlotheim's specimen, I restored Phillips's specific name of gcmmn- 

 lifera for this Carboniferous Limestone form, and discarded that of Schlotheim 

 (T. pustulatus) as untenable. Having lately seen and consulted my friend Prof. 

 Dr. Ferdinand Roemer, of the Mineralogischen Museum, Breslau, our highest 

 authority on the fossils of the Eifel, he very kindly promised me, on his return 

 journey, in passing through Berlin to Breslau, to compare my figure of Phillipsia 

 gemmulifera with Schlotheim's specimen of Trilobites pustulatus in the Berlin 

 Museum. I now have the pleasure to append his letter, which entirely sets the 

 matter at rest. 



" Miner alogical Museum of the 



" Royal University of Breslau. 

 " Dear Dr. Woodward, 



" Schlotheim's Trilobites pustulatus is nothing else than a pygidium of 

 Phacops latifrons from the Eifel. This is proved beyond any doubt by 

 Schlotheim's original specimen in the Berlin Museum. 



" Yours very truly, 



" Ferd. Roemer." 

 « 17th October, 1883." 



Genus 3. — 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 surround- 

 ing 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 pro- 

 duced posteriorly into spines. The entire surface of the head covered irregularly 

 with a small bead-like ornamentation. 



Thoracic segments not known, probably nine in number. 



