﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  1081 
  

  

  Subgenus 
  Camerothyris, 
  Bittner. 
  1890. 
  

  

  Shells 
  with 
  the 
  contour 
  and 
  loop 
  of 
  Aulacothyris, 
  but 
  having 
  

   the 
  dental 
  plates 
  convergent 
  and 
  united. 
  

  

  (Type, 
  Camerothyris 
  Bamsaueri, 
  Suess 
  (sp.). 
  Trias.) 
  

  

  ; 
  ■ 
  

  

  ;a 
  

  

  *- 
  _ 
  , 
  

  

  Figs. 
  589-591. 
  Camerothyris 
  Ramsaueri, 
  Suess 
  (sp.) 
  (Bittner.) 
  

  

  (It 
  is 
  suggested 
  by 
  (Ehlert 
  that 
  the 
  genus 
  Orthoidea, 
  Friren, 
  

   1875, 
  is 
  based 
  on 
  young 
  shells 
  of 
  Magellania 
  numismalis, 
  Lamarck. 
  

   Lias.) 
  

  

  Terebratalia, 
  Beecher. 
  1893. 
  

  

  Magellaniiform 
  shells, 
  having 
  the 
  adult 
  loop 
  of 
  precisely 
  simi- 
  

   lar 
  structure 
  to 
  that 
  of 
  Terebratella, 
  but 
  derived 
  through 
  a 
  

   dissimilar 
  series 
  of 
  metamorphoses, 
  namely, 
  through 
  stages 
  cor- 
  

   responding 
  successively 
  with 
  the 
  adult 
  condition 
  in 
  Platidia, 
  

  

  ISMENIA 
  and 
  Mt/HLFELDTIA. 
  

  

  Figs. 
  592-594. 
  Terebratalia 
  transversa, 
  Sowerby 
  (sp.). 
  (Davidson 
  ) 
  

  

  Type, 
  Terebratalia 
  transversa, 
  Sowerby 
  (sp.). 
  

   Distribution. 
  Recent 
  (Arctic, 
  Boreal, 
  Japanese, 
  Aleutian 
  and 
  

   Californian 
  Provinces). 
  

  

  Laqueus, 
  Dall. 
  1870. 
  

  

  Synonym; 
  Fremila, 
  Dall, 
  1871. 
  

  

  Shells 
  differing 
  from 
  Terebratella 
  only 
  in 
  the 
  structure 
  of 
  the 
  

   loop, 
  which 
  bears 
  two 
  lateral 
  processes, 
  connecting 
  the 
  ascending 
  

   136 
  139 
  

  

  