﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  1085 
  

  

  median 
  septum 
  a 
  short 
  distance 
  above 
  the 
  insertion 
  of 
  the 
  

   descending 
  branches. 
  

  

  Type, 
  Magasella 
  Adamsi, 
  Davidson 
  (sp.). 
  

  

  Figs. 
  609, 
  610. 
  Magasella 
  Adamsi, 
  Davidson 
  (sp.). 
  (Woodward.) 
  

  

  Distribution. 
  Recent 
  ( 
  Australo-Zealandian, 
  Japanese, 
  Aleutian 
  

   and 
  Magellanian 
  Provinces.) 
  

  

  Muhlfeldtia, 
  Bayle. 
  1*80. 
  

  

  Synonym 
  ; 
  Megerlia, 
  King, 
  1850. 
  

  

  Shells 
  transverse 
  or 
  elongate, 
  the 
  transverse 
  forms 
  having 
  a 
  

   straight 
  hinge-line 
  and 
  a 
  well-developed 
  cardinal 
  area 
  on 
  each 
  

   valve. 
  Beaks 
  low, 
  foramen 
  large, 
  deltidial 
  plates 
  incomplete. 
  

   Surface 
  radiate. 
  Cardinal 
  process 
  large. 
  ? 
  J 
  In 
  the 
  yoop 
  the 
  

   descending 
  processes 
  unite 
  anteriorly 
  with 
  the 
  ascending 
  

   branches, 
  the 
  latter 
  being 
  joined 
  at 
  their 
  base 
  to 
  the 
  median 
  

  

  Figs. 
  611-613. 
  Muhlfeldtia 
  truncata, 
  Linn6 
  (sp.). 
  (Davidson.) 
  

  

  septum, 
  whence 
  they 
  bend 
  forward 
  and 
  recurve. 
  The 
  lateral 
  

   or 
  basal 
  portions 
  of 
  the 
  ring 
  thus 
  formed 
  are 
  expanded 
  and, 
  in 
  

   final 
  stages 
  of 
  development, 
  broadly 
  perforated. 
  Internal 
  surface 
  

   of 
  the 
  valves 
  covered 
  with 
  radiating 
  rows 
  of 
  pustules. 
  

  

  Type, 
  Muhlfeldtia 
  truncata, 
  Linne 
  (sp.). 
  

  

  Distribution. 
  Tertiary 
  — 
  Recent 
  (Lusitanian, 
  West 
  African, 
  

   Indo-Pacific, 
  Australo-Zealandian 
  and 
  Japanese 
  Provinces.) 
  

  

  143 
  

  

  