﻿Report 
  of 
  the 
  State 
  Geologist 
  

  

  1077 
  

  

  Type, 
  Macandrevia 
  cranium, 
  Mtiller 
  (sp.). 
  

   Distribution. 
  Recent 
  (Boreal, 
  Lusitanian 
  and 
  Japanese 
  

   Provinces.) 
  

  

  Subgenus 
  Zeilleria, 
  Bayle. 
  1878. 
  

  

  Shell 
  with 
  biplicate 
  brachial 
  valve, 
  dental 
  plates 
  and 
  long 
  

   loop. 
  

  

  Fig. 
  569. 
  

  

  Fig. 
  568. 
  

  

  Fig. 
  570. 
  

   Figs. 
  568-570. 
  Zeilleria 
  cornuta, 
  Sowerby 
  (sp.). 
  (Davidson.) 
  

  

  (Type, 
  Zeilleria 
  cornuta, 
  Sowerby 
  (sp.). 
  Jurassic.) 
  

  

  Subgenus 
  Fimbriothyris, 
  Deslongchamps. 
  1884. 
  

  

  Shells 
  biconvex, 
  elongate, 
  smooth 
  in 
  early 
  growth^developing 
  

   marginal 
  angular 
  plications 
  at 
  maturity. 
  

  

  Figs. 
  571, 
  572. 
  Fimbriothyris 
  Guerangeri, 
  Deslongchamps 
  (sp.). 
  (Quenstedt.) 
  

  

  (Type, 
  Fimbriothyris 
  Guerangeri, 
  Deslongchamps, 
  Jurassic.) 
  

  

  135 
  

  

  