﻿1050 
  JBORTT- 
  SEVENTH 
  REPORT 
  ON 
  THE 
  STATE 
  MUSEUM. 
  

  

  of 
  the 
  loop 
  and 
  median 
  plate 
  are 
  covered 
  with 
  minute, 
  obliquely 
  

   conical 
  pustules, 
  in 
  some 
  cases 
  seeming 
  to 
  become 
  spinulous. 
  

  

  Fig. 
  46vi. 
  Fig. 
  470. 
  

  

  Romingerina 
  Julia, 
  A. 
  Winchell. 
  

   Fig. 
  469. 
  A 
  restoration 
  of 
  the 
  loop; 
  showing 
  the 
  extent 
  of 
  the 
  median 
  plate. 
  

   Fig. 
  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 
  

  

  Fig. 
  471. 
  Trigeria 
  Guerangeri, 
  de 
  Verneuil 
  (sp.). 
  

   The 
  interior 
  of 
  the 
  brachial 
  valve; 
  showing 
  the 
  perforated 
  hinge-plate 
  and 
  the 
  muscular 
  

   gears. 
  (CEhlbrt.) 
  

  

  being 
  perforated 
  by 
  a 
  visceral 
  foramen. 
  Brachidium 
  as 
  in 
  

  

  Centronella, 
  though 
  with 
  a 
  smaller 
  anterior 
  plate. 
  

  

  Type, 
  Trigeria 
  Guerangeri, 
  de 
  Yerneuil 
  (sp.). 
  

  

  i 
  itrilution. 
  Devonian. 
  

  

  108 
  

  

  