﻿EXPLANATION 
  OF 
  PLATES 
  329 
  

  

  Plate 
  4.— 
  MODIOLUS, 
  ADULA, 
  AND 
  ASTHENOTHAERUS 
  

   Figure 
  Poge 
  

  

  1. 
  Adula 
  calijorniensis 
  (Philippi) 
  '4 
  

  

  Adida 
  stylina 
  Carpenter. 
  San 
  Diego, 
  Hemphill. 
  Redpath 
  Mus., 
  No. 
  109. 
  Length, 
  

   12 
  mm. 
  ; 
  height, 
  5.5 
  mm. 
  ; 
  thickness, 
  2 
  mm. 
  

  

  2. 
  Adtila 
  calijorniensis 
  (Philippi) 
  74 
  

  

  Adula 
  stylina 
  Carpenter. 
  San 
  Diego, 
  Hemphill. 
  Redpath 
  Mus., 
  No. 
  109. 
  Length, 
  

   20 
  mm. 
  ; 
  height, 
  6 
  mm. 
  

  

  3. 
  Adula 
  calijorniensis 
  (Philippi) 
  74 
  

  

  Adula 
  stylina 
  Carpenter. 
  San 
  Diego, 
  Hemphill. 
  Redpath 
  Mus., 
  No. 
  109. 
  Length, 
  

   23 
  mm. 
  ; 
  height, 
  9 
  mm. 
  

  

  4. 
  Adula 
  calijorniensis 
  (Philippi) 
  74 
  

  

  Adula 
  stylina 
  Carpenter. 
  San 
  Diego, 
  Hemphill. 
  Redpath 
  Mus., 
  No. 
  109. 
  Length, 
  

   19 
  inm. 
  ; 
  height, 
  7 
  mm. 
  ; 
  thickness, 
  7 
  mm. 
  

  

  5. 
  6. 
  Asthenothaerus 
  villosior 
  Carpenter 
  75 
  

  

  Holotype, 
  left 
  valve, 
  U.S.N. 
  M., 
  No. 
  16292. 
  Length, 
  11 
  mm.; 
  height, 
  6+ 
  mm.; 
  

   thickness, 
  2 
  mm. 
  

  

  7. 
  Asthenothaerus 
  villosior 
  Carpenter 
  75 
  

  

  Holotype, 
  right 
  valve, 
  U.S.N.M., 
  No. 
  16292. 
  Length, 
  11 
  mm.; 
  height, 
  6+ 
  mm.; 
  

   thickness, 
  2 
  mm. 
  

  

  8, 
  9. 
  Asthenothaerus 
  villosior 
  Carpenter 
  75 
  

  

  Enlargement 
  of 
  hinges 
  of 
  holotype. 
  

  

  10-12. 
  Modiolus 
  jornicatus 
  (Carpenter) 
  7Z 
  

  

  Holotype, 
  Redpath 
  Mus., 
  No. 
  3133. 
  Length, 
  36 
  mm. 
  ; 
  height, 
  20 
  mm. 
  ; 
  thickness, 
  

   12 
  mm. 
  

  

  