﻿1072 
  Forty- 
  seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  growth]of 
  the 
  lateral 
  portions 
  the 
  shell 
  oecomes 
  bilobed, 
  the 
  two 
  

   lobes 
  inclosing 
  a 
  perforation 
  situated 
  posteriorly 
  in 
  the 
  median 
  

   line. 
  Loop 
  short. 
  

  

  [Fig. 
  539. 
  Pygope 
  diphya, 
  Colonna 
  (sp.). 
  (Woodward). 
  

  

  Type, 
  Pygope 
  diphya, 
  Colonna 
  (sp.). 
  

   Distribution. 
  Jurassic. 
  

  

  Propygope, 
  Bittner. 
  1890. 
  

   Shells 
  small 
  with 
  the 
  naviculoid 
  contour 
  of 
  Atjlacothyeis 
  but 
  

   with^a 
  short 
  loop. 
  Dental 
  plates 
  absent. 
  Brachial 
  valve 
  with 
  

   a 
  short 
  median 
  septum. 
  

  

  Figs. 
  540-543. 
  Propygope 
  Hagar, 
  Bittner. 
  (Bittner.) 
  

  

  Type, 
  Propygope 
  Hagar, 
  Bittner. 
  

   Distribution. 
  Trias. 
  

  

  Subgenus 
  Zugmayeria, 
  Waagen. 
  1882. 
  

   Shells 
  biplicate 
  ; 
  loop 
  short 
  ; 
  with 
  strong 
  ^dental 
  plates 
  and 
  

   witnout 
  crural 
  plates. 
  

  

  Figs. 
  544-547. 
  "Zugmayeria 
  rhcetica, 
  Zugmayer 
  (sp.). 
  (Zugmayer.) 
  

  

  Type, 
  Zugmayeria 
  rlioetiea, 
  Zugmayer 
  (sp.). 
  

   Distribution. 
  Triassic. 
  

  

  130 
  

  

  