﻿1076 
  Forty- 
  seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  Ccenothyris, 
  Douville. 
  1880. 
  

  

  Shells~elon2;ate-oval, 
  smooth. 
  Dental 
  plates 
  highly 
  developed, 
  

  

  becoming 
  calloused 
  with 
  age. 
  Hinge-plate 
  large, 
  tripartite 
  

  

  and^supported 
  by 
  a 
  median 
  septum 
  extending 
  one-half 
  the 
  length 
  

  

  of 
  the 
  shell. 
  Cardinal 
  process 
  absent 
  or 
  very 
  faint. 
  Loop 
  broad 
  

  

  Fig. 
  564, 
  Ccenothyris 
  vulgaris, 
  Schlotheim 
  (sp.). 
  (Koschinsky.) 
  

  

  and 
  moderately 
  long, 
  the 
  ascending 
  branches 
  forming 
  at 
  their 
  union 
  

   a 
  shield-shaped 
  plate 
  which 
  is 
  not 
  attached 
  to 
  the 
  median 
  septum. 
  

  

  Type, 
  Cwnothyris 
  vulgaris, 
  Schlotheim 
  (sp.). 
  

  

  Distribution. 
  Trias. 
  

  

  Hynniphoria, 
  Suess. 
  1858. 
  

   Small, 
  subglobular 
  smooth 
  shells 
  said 
  to 
  contain 
  a 
  " 
  plowshare"- 
  

   shaped 
  process 
  on 
  the 
  brachial 
  apparatus. 
  Imperfectly 
  known. 
  

   Type, 
  Hynniphoria 
  globularis, 
  Suess. 
  Jurassic. 
  

  

  Macandrevia, 
  King. 
  1859. 
  

   Shells 
  biconvex, 
  smooth, 
  elongate-oval. 
  Foramen 
  large 
  and 
  

   without 
  deltidial 
  plates. 
  Pedicle-valve 
  with 
  dental 
  plates. 
  

  

  Fig. 
  565. 
  Fig. 
  566. 
  Fig. 
  567. 
  

  

  Figs. 
  565-567. 
  Macandrevia 
  cranium, 
  Miiller 
  (sp 
  ). 
  (Davidson.) 
  

  

  Brachial 
  valve 
  without 
  cardinal 
  process, 
  but 
  with 
  crural 
  plates 
  

   and 
  sometimes 
  the 
  remnant 
  of 
  a 
  median 
  septum. 
  Loop 
  in 
  its 
  

   mature 
  condition 
  similar 
  to 
  that 
  of 
  Magellania. 
  

  

  134 
  

  

  