﻿Report 
  of 
  the 
  State 
  Geologist. 
  

  

  1067 
  

  

  of 
  pedicle-valve 
  without 
  dental 
  plates. 
  In 
  the 
  brachial 
  valve 
  

   the 
  cardinal 
  process 
  is 
  slightly 
  developed; 
  hinge-plate 
  and 
  

   median 
  septum 
  wanting 
  ; 
  socket 
  walls 
  prominent, 
  supporting 
  a 
  

   short 
  loop 
  which 
  is 
  rendered 
  annular 
  by 
  the 
  union 
  of 
  the 
  oval 
  

   processes. 
  

  

  Brachia 
  as 
  in 
  Liothykina, 
  the 
  median 
  unpaired 
  arm 
  being 
  

   small. 
  Each 
  lobe 
  of 
  the 
  mantle 
  bears 
  four 
  sinuses; 
  genital 
  

  

  Figs. 
  [518-522. 
  Terebratulina 
  caput-serpentis, 
  Linn6 
  (sp.). 
  (Davidson; 
  Barrett.) 
  

  

  glands 
  six, 
  two 
  in 
  each 
  mantle 
  lobe 
  and 
  two 
  in 
  the 
  visceral 
  

   cavity. 
  

  

  Type, 
  Terebratulina 
  caput-serpentis, 
  Linne 
  (sp.). 
  

  

  Distribution. 
  Jurassic 
  — 
  Kecent 
  (Arctic, 
  Boreal, 
  Lusitanian, 
  

   West 
  African, 
  Indo-Pacific, 
  Australo-Zealandian, 
  Japanese, 
  

   Aleutian, 
  Californian, 
  Magellanian, 
  Caribbean 
  and 
  Transatlantic 
  

   Provinces). 
  

  

  125 
  

  

  