856 Report or THE Strate Gxoxoaisr. 
of the loop and median plate are covered with minute, obliquely 
conical pustules, in some cases seeming to become spinulous. 
Fia. 469. Fie. 470. 
Romingerina Julia, A. Winchell. 
Fie. 469. A restoration of the loop; showing the extent of the median plate. 
Fie, 470. A profile view; showiag the elevation of this plate, the double curvature of its 
upper margin and its fimbriated edge. x 4. 
(A. WINCHELL.) 
(Type, Romingerina Julia, A. Winchell (sp.). Upper Devo- 
nian — Lower Carboniferous.) 
Trigeria, Bayle. 1875. 
(Plate 52, figs. 8-10.) 
Plicated centronellids with plano-convex valves. In the 
brachial valve the hinge-plate is tripartite, the median division 
“~ 
Fia. 471. Trigeria Guerangeri, de Verneuil (sp.). 
The interior of the brachial valve; showing the perforated hinge-plate and the muscular 
scars. (Q0HLERT.) 
being perforated by a visceral foramen. Brachidium as in 
CrnTRONELLA, though with a smaller anterior plate. 
Type, Zrigeria Guerangeri, de Verneuil (sp.). 
Distribution. Devonian. 
108 
