﻿6 
  

  

  PAGE. 
  

  

  Valves, 
  position 
  of 
  . 
  . 
  . 
  6 
  

  

  Van 
  Beneden 
  .... 
  24, 
  37 
  

  

  Van 
  Leeuwenhock, 
  A 
  . 
  . 
  76 
  

  

  Vanne 
  cxiv 
  

  

  Verrill, 
  Prof 
  .... 
  24, 
  78 
  

  

  Vibrones 
  25, 
  32 
  

  

  Von 
  Jhering 
  5 
  

  

  Von 
  Ergo 
  Rich. 
  Ritter 
  , 
  ^^ 
  

  

  Vorticello 
  38 
  j 
  Xylotrya 
  fimbriata 
  

  

  W 
  

  

  White, 
  Dr. 
  C. 
  A 
  ... 
  . 
  29 
  

  

  Whitman 
  86 
  

  

  Why 
  dredging 
  injures 
  beds 
  30 
  

  

  Willis 
  76 
  

  

  Winslow, 
  Francis, 
  (cvi), 
  

  

  4, 
  62, 
  75 
  

  

  X 
  

  

  Yield 
  of 
  the 
  Potomac 
  

  

  Zoothamnium 
  asbusculum 
  

  

  35 
  

  

  