﻿116 
  

  

  there. 
  It 
  belongs 
  to 
  tbo 
  more 
  southern 
  fauna, 
  having 
  been 
  

   first 
  described 
  from 
  S. 
  Carolina 
  and 
  Florida, 
  

  

  Acad. 
  Collection. 
  

  

  XXXIIIb-APHREDODERIDS;, 
  

  

  APHREDODERUS. 
  

  

  Since 
  but 
  one 
  single 
  fish 
  forms 
  this 
  famil}', 
  it 
  is 
  well 
  to 
  define 
  

   the 
  characters, 
  quoting 
  them 
  from 
  Guenther. 
  

  

  Clei't 
  of 
  the 
  mouth 
  sliglitly 
  oblique, 
  with 
  the 
  lower 
  jaw 
  

   longest 
  ; 
  eye 
  moderate. 
  Villiform 
  teeth 
  in 
  both 
  the 
  jaws, 
  on 
  

   the 
  vomer 
  and 
  on 
  the 
  palatine 
  bones. 
  Six 
  branchiostegals. 
  

   Infraorbital 
  and 
  pr{?eopercQlum 
  with 
  spinous 
  teeth. 
  Scales 
  

   moderate, 
  etenoid. 
  Dorsal 
  witli 
  three, 
  anal 
  with 
  two 
  spines. 
  

   Caudal 
  is 
  rounded. 
  

  

  A. 
  sayanuti. 
  

  

  The 
  Spineless 
  Perch, 
  

  

  The 
  height 
  of 
  the 
  body 
  is 
  4J 
  in 
  the 
  total 
  length, 
  of 
  which 
  

   the 
  head 
  is 
  one-fourth 
  ; 
  the 
  diameter 
  of 
  the 
  eye 
  is 
  less 
  than 
  

   the 
  distance 
  from 
  the 
  cud 
  of 
  the 
  snout, 
  and 
  two-thirds 
  of 
  the 
  

   distance 
  between 
  the 
  eye. 
  The 
  body 
  is 
  oblong, 
  thick 
  and 
  

   aub-compressed 
  ; 
  the 
  back 
  is 
  elevated, 
  descending 
  with 
  an 
  

   equal 
  curve 
  from 
  the 
  soft 
  rays 
  of 
  the 
  dorsal 
  to 
  the 
  nape. 
  

   From 
  45 
  to 
  50 
  scales 
  are 
  in 
  a 
  longitudinal 
  series 
  ; 
  they 
  are 
  

   small, 
  rough, 
  rounded 
  and 
  ciliated. 
  The 
  lateral 
  line 
  is 
  but 
  

   slightly 
  curved, 
  almost 
  straight, 
  passing 
  near 
  the 
  middle 
  

   of 
  the 
  body. 
  The 
  head 
  is 
  flattened 
  above. 
  A 
  bony 
  crest, 
  

   supporting 
  two 
  or 
  three 
  spines, 
  which 
  are 
  continuous 
  with 
  

   the 
  denticulated 
  crest 
  of 
  the 
  upper 
  margin, 
  is 
  on 
  the 
  anterior 
  

   portion 
  of 
  the 
  sub-orbital, 
  so 
  that 
  the 
  lower 
  margin 
  of 
  the 
  

   orbit 
  is 
  smooth, 
  while 
  the 
  upper 
  two-thirds 
  of 
  the 
  margin 
  is 
  

   rough 
  ; 
  a 
  longitudinal 
  furrow 
  ini 
  formed 
  by 
  two 
  crests. 
  The 
  

  

  