﻿79 
  

  

  illaries 
  ; 
  one 
  or 
  two 
  pairs 
  of 
  vomerine 
  fangs 
  ; 
  two 
  rows 
  npon 
  

   the 
  tongue, 
  of 
  Avhicli 
  the 
  anterior 
  four 
  or 
  five 
  teeth 
  were 
  

   fang-like, 
  and 
  generally 
  with 
  a 
  single 
  Aing 
  at 
  the 
  extremity 
  

   of 
  the 
  tongue 
  ; 
  two 
  rows 
  of 
  small 
  teeth 
  upon 
  the 
  anterior 
  

   portion 
  of 
  the 
  mandible; 
  of 
  which 
  the 
  inner 
  were 
  the 
  

   larger 
  ; 
  tlie 
  outer 
  row 
  of 
  mandibular 
  teeth 
  extended 
  later- 
  

   ally 
  upon 
  the 
  mandibles, 
  but 
  were 
  more 
  scattered 
  and 
  larger 
  

   than 
  anterior, 
  and 
  also 
  larger 
  than 
  those 
  in 
  the 
  inner 
  ante- 
  

   rior 
  row. 
  There 
  were 
  also 
  rows 
  of 
  palatine 
  and 
  pterygoid 
  

   teeth, 
  hut 
  they 
  were 
  all 
  small. 
  

  

  All 
  the 
  teeth 
  were 
  recurved 
  to 
  a 
  greater 
  or 
  less 
  extent. 
  

   kScc 
  Fig's 
  8, 
  9 
  and 
  12, 
  Fl. 
  Y. 
  The 
  viscera 
  was 
  similar, 
  

   and 
  the 
  number 
  of 
  pyloric 
  ca?ca 
  five 
  in 
  each. 
  The 
  head 
  in 
  

   the 
  two 
  fish 
  showed 
  greater 
  variation. 
  In 
  the 
  Xew 
  England 
  

   Smelt 
  it 
  was 
  fuller 
  ; 
  the 
  lower 
  jaw 
  did 
  not 
  protrude 
  so 
  far 
  

   beyond 
  the 
  upper, 
  and 
  the 
  gape 
  of 
  the 
  mouth 
  was 
  not 
  as 
  

   great 
  vertically. 
  The 
  difference 
  in 
  the 
  fullness 
  of 
  the 
  head 
  

   and 
  the 
  rounder 
  snout 
  and 
  less 
  prominent 
  mandible 
  in 
  the 
  

   New 
  England 
  fish, 
  are 
  shown 
  in 
  Fig's 
  13 
  and 
  16, 
  PI. 
  Y. 
  

   The 
  great 
  gape 
  of 
  mouth 
  in 
  the 
  Raritan 
  Smelt 
  is 
  shown 
  in 
  

   Fig. 
  y, 
  PI. 
  Y. 
  The 
  general 
  shape 
  of 
  the 
  head 
  in 
  the 
  Pari- 
  

   tan 
  Smelt, 
  Fig 
  8, 
  PI. 
  Y, 
  is 
  more 
  delicate 
  and 
  pointed 
  than 
  

   in 
  the 
  other, 
  Fig. 
  12, 
  PI. 
  "V 
  ; 
  the 
  top 
  of 
  the 
  head, 
  back 
  from 
  

   the 
  eyes, 
  is 
  slightly 
  flattened, 
  from 
  whence 
  there 
  is 
  a 
  rise 
  to 
  

   the 
  dorsal 
  contour 
  line 
  of 
  the 
  body. 
  The 
  delicacy 
  of 
  the 
  

   head 
  is 
  due 
  to 
  the 
  slight 
  contraction 
  of 
  the 
  sides 
  of 
  the 
  head 
  

   in 
  the 
  region 
  of 
  the 
  eyes. 
  Fig. 
  13, 
  PI, 
  Y, 
  and 
  the 
  protrusion 
  

   of 
  the 
  jaws 
  thus 
  narrowed 
  into 
  a 
  more 
  slender 
  snout. 
  

  

  The 
  lateral 
  line 
  in 
  eacli 
  begins 
  at 
  the 
  dorsal 
  extremity 
  of 
  

   the 
  gill-opening, 
  curves 
  ventrally 
  and 
  posteriorly 
  for 
  a 
  short 
  

   distance, 
  then 
  passes 
  in 
  a 
  straight 
  line 
  to 
  the 
  tail, 
  near 
  its 
  

   center. 
  The 
  differences 
  upon 
  which 
  we 
  have, 
  then, 
  to 
  form 
  

   two 
  species 
  of 
  them, 
  are, 
  Jirs', 
  a 
  higher 
  coloration 
  of 
  the 
  

   back 
  and 
  of 
  the 
  first 
  fin-rays 
  in 
  one 
  than 
  in 
  the 
  other 
  ; 
  

   second, 
  in 
  size, 
  and 
  tJdrd, 
  in 
  the 
  shape 
  of 
  the 
  head. 
  As 
  

   regards 
  the 
  frost-fish 
  and 
  silversides, 
  upon 
  placing 
  side 
  by 
  

  

  