﻿DESCRIPTION 
  OF 
  A 
  NEW 
  BLENNY-LIKE 
  FISH 
  OF 
  THE 
  

   GENUS 
  OPISTHOCENTRUS, 
  COLLECTED 
  IN 
  VULCANO 
  

   BAY, 
  PORT 
  MORORAN, 
  JAPAN, 
  BY 
  NICOLAI 
  A. 
  GREB- 
  

   NITSKI. 
  

  

  By 
  Tarleton 
  H. 
  Bean, 
  

  

  Honorary 
  Curator 
  of 
  the 
  Department 
  of 
  Fishes, 
  

   and 
  

  

  Barton 
  A. 
  Bean, 
  

  

  Assistant 
  Curator 
  of 
  the 
  Department 
  of 
  Fishes. 
  

  

  In 
  our 
  notes 
  on 
  Fishes 
  collected 
  in 
  Kamchatka 
  and 
  Japan 
  by 
  

   Leonhard 
  Stejneger 
  and 
  Nicolai 
  A. 
  Grebnitski' 
  we 
  doubtfnlly 
  placed 
  

   Opistliocentrus 
  (No. 
  47565, 
  U.S.N.M.) 
  with 
  Ivner's 
  species 
  0. 
  quinque- 
  

   maculatus. 
  We 
  now 
  consider 
  it 
  quite 
  distinct 
  and 
  describe 
  it 
  as 
  new, 
  

   under 
  the 
  name 
  

  

  OPISTHOCENTRUS 
  TENUIS, 
  new 
  species. 
  

  

  Type.—^o. 
  47565, 
  U.S.N.M. 
  ; 
  collected 
  in 
  July, 
  1894, 
  in 
  Vulcano 
  Bay, 
  

   Port 
  Mororau, 
  Japan, 
  by 
  N. 
  A. 
  Grebnitski. 
  

  

  D. 
  39, 
  XV; 
  A. 
  38. 
  

  

  Length 
  of 
  fish 
  to 
  caudal 
  base, 
  5^ 
  inches; 
  length 
  of 
  head, 
  1; 
  depth 
  of 
  

   body, 
  |. 
  The 
  greatest 
  width 
  of 
  the 
  body 
  is 
  contained 
  two 
  and 
  one-half 
  

   times 
  in 
  the 
  length 
  of 
  the 
  head. 
  The 
  diameter 
  of 
  the 
  eye 
  is 
  nearly 
  

   equal 
  to 
  the 
  length 
  of 
  the 
  snout 
  and 
  is 
  contained 
  four 
  and 
  one-half 
  

   times 
  in 
  the 
  length 
  of 
  the 
  head. 
  The 
  width 
  of 
  the 
  iuterorbital 
  space 
  is 
  

   almost 
  equal 
  to 
  the 
  long 
  diameter 
  of 
  eye. 
  The 
  maxilla 
  reaches 
  to 
  the 
  

   vertical 
  past 
  front 
  of 
  eye. 
  Teeth 
  bluntly 
  rounded, 
  imbedded 
  in 
  flesh; 
  

   vomerine 
  teeth 
  present; 
  palatines 
  uone. 
  

  

  The 
  origin 
  of 
  the 
  dorsal 
  flu 
  is 
  over 
  the 
  end 
  of 
  the 
  gill 
  cover. 
  Its 
  first 
  

   thirty-nine 
  rays 
  are 
  simple 
  and 
  flexible, 
  the 
  last 
  fifteen 
  are 
  strong 
  spines 
  

   and 
  end 
  slightly 
  above 
  the 
  membrane 
  in 
  stiff 
  jioints. 
  The 
  longest 
  

   spine 
  is 
  almost 
  one-third 
  as 
  long 
  as 
  the 
  head. 
  The 
  anal 
  origiuates 
  

   under 
  the 
  twentieth 
  ray 
  of 
  the 
  dorsal. 
  Its 
  rays 
  are 
  divided 
  and 
  artic- 
  

   ulated. 
  The 
  longest 
  ray 
  is 
  one-third 
  as 
  long 
  as 
  the 
  head. 
  

  

  1 
  Proc. 
  U. 
  S. 
  Nat. 
  Mus., 
  XIX, 
  1896, 
  pp. 
  381-392. 
  

   [Advance 
  sheet 
  of 
  this 
  paper 
  was 
  published 
  January 
  28, 
  1897] 
  

  

  Proceedings 
  U. 
  S 
  National 
  Museum, 
  Vol. 
  XX— 
  No. 
  1 
  127. 
  

  

  463 
  

  

  