﻿1074 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  plates 
  well 
  developed. 
  Pedicle-valve 
  without 
  dental 
  plates. 
  In 
  

   the 
  brachial 
  valve 
  is 
  a 
  conspicuous 
  trilobed 
  cardinal 
  process 
  and 
  

   a 
  hinge-plate 
  supported 
  by 
  a 
  median 
  septum 
  which 
  may 
  be 
  more 
  

   or 
  less 
  developed. 
  Loop 
  long, 
  extending 
  nearly 
  to 
  the 
  anterior 
  

  

  b 
  

  

  Fig. 
  557. 
  

  

  Figs 
  557,558. 
  MageUania 
  flavescens. 
  a, 
  pedicle- 
  valve; 
  b, 
  brachial 
  valve; 
  c, 
  adductor 
  scars; 
  

   d, 
  diductors; 
  e, 
  sccessory 
  diductors; 
  p, 
  ventral 
  pedicle-muscle; 
  v, 
  median 
  pedicle-muscle. 
  

   (Davidson.) 
  

  

  Fig. 
  558. 
  

  

  Fig. 
  559. 
  

  

  Fig. 
  559. 
  Magellania 
  flavescens, 
  showing 
  Fig. 
  5C0. 
  The 
  brachial 
  supports 
  of 
  Magel- 
  

  

  the 
  brachia. 
  (Davidson.) 
  lania 
  flavescens. 
  (Hancock.) 
  

  

  margins 
  of 
  the 
  valves 
  ; 
  oral 
  processes 
  large, 
  not 
  united 
  ; 
  ascend- 
  

   ing 
  branches 
  extending 
  backward 
  to 
  or 
  beyond 
  the 
  center 
  of 
  the 
  

   shell 
  and 
  united 
  by 
  a 
  stout 
  transverse 
  lamella. 
  Muscular 
  area 
  

   posterior 
  in 
  both 
  valves. 
  

  

  132 
  

  

  