﻿PACHYCOEMIDJE. 
  

  

  403 
  

  

  Fig. 
  41. 
  

  

  Outlines 
  of 
  Rostra 
  of 
  Protosphyrana 
  in 
  lateral 
  aspect 
  and 
  transverse 
  section, 
  

   one-half 
  natural 
  size. 
  

  

  No. 
  1. 
  Protosphyrcsna 
  tenuirostris, 
  A. 
  S. 
  Woodward. 
  — 
  Cambridge 
  Greensand. 
  

  

  [Woodwardian 
  Museum, 
  Cambridge.] 
  

   No. 
  2. 
  Protospkyrcena 
  compressirostris, 
  A. 
  S. 
  Woodward. 
  — 
  Kentish 
  Chalk. 
  

  

  [No. 
  P. 
  5631.] 
  

   No. 
  3. 
  Protosphyrcsna 
  ferox, 
  Leidy. 
  — 
  Kentish 
  Chalk. 
  [No. 
  P. 
  5630.] 
  

   No. 
  4. 
  Protosphyrcena 
  keepingi, 
  A. 
  S. 
  Woodward.— 
  Cambridge 
  Greensand. 
  

  

  [Woodwardian 
  Museum, 
  Cambridge.] 
  

  

  2d2 
  

  

  