﻿686 
  

  

  REPORT 
  OF 
  COMMISSIONER 
  OF 
  FISH 
  AND 
  FISHERIES. 
  

  

  [82] 
  

  

  us 
  in 
  P." 
  longirostris 
  ; 
  and 
  P. 
  Goodvi, 
  which, 
  though 
  resembling 
  the 
  con- 
  

   strictus 
  in 
  external 
  characters, 
  has 
  the 
  mandibular 
  palpi, 
  epipods, 
  and 
  

   branchiae 
  as 
  in 
  P. 
  longirostris, 
  and 
  long 
  aud 
  slender 
  exopods 
  at 
  the 
  

   bases 
  of 
  all 
  the 
  perseopods. 
  

  

  Pauapen^us 
  constrictus 
  Smith. 
  

  

  Penceus 
  constrictus 
  Stiuipson, 
  Ann. 
  Lye. 
  Nat. 
  Hist. 
  New 
  York, 
  x, 
  p. 
  135, 
  1871. 
  

   Parapenmis 
  constrictus 
  Smith, 
  Proc. 
  National 
  Mus., 
  viii, 
  p. 
  174, 
  1885. 
  

  

  Speciviens 
  examined. 
  

  

  [Locality 
  : 
  Off 
  Cape 
  Hatteras.] 
  

  

  All 
  these 
  specimens 
  agree 
  well 
  with 
  Stimpson's 
  description 
  except 
  

   that 
  the 
  carina 
  of 
  the 
  carapax 
  is 
  scarcely 
  grooved 
  longitudinally, 
  though 
  

   distinctly 
  flattened, 
  at 
  the 
  cervical 
  suture. 
  The 
  dorsal 
  crest 
  of 
  the 
  

   rostrum 
  proper 
  is 
  armed 
  with 
  seven 
  to 
  nine 
  equidistant 
  teeth, 
  and 
  back 
  

   of 
  these, 
  on 
  the 
  carina 
  of 
  the 
  gastric 
  region, 
  there 
  is 
  a 
  small 
  tooth, 
  de- 
  

   scribed 
  by 
  Stimpson 
  as 
  the 
  gastric 
  tooth, 
  and 
  not 
  referred 
  to 
  in 
  con- 
  

   nection 
  with 
  the 
  rostral 
  teeth, 
  which 
  explains 
  the 
  apparent 
  discrepancy 
  

   pointed 
  out 
  by 
  Miers 
  (Proc. 
  Zool. 
  Soc. 
  London, 
  1S78, 
  p. 
  304) 
  between 
  

   Stimpson's 
  description 
  and 
  the 
  specimen 
  in 
  the 
  British 
  Museum. 
  The 
  

   surface 
  of 
  the'posterior 
  part 
  of 
  the 
  branchial 
  regions 
  of 
  the 
  carapax 
  

   and 
  of 
  the 
  whole 
  of 
  the 
  pleon, 
  except 
  a 
  very 
  narrow 
  and 
  inconspicuous 
  

   line 
  of 
  pubescence 
  either 
  side 
  of 
  the 
  dorsal 
  carina 
  of 
  the 
  fifth 
  and 
  sixth 
  

   somites, 
  is 
  entirely 
  naked 
  and 
  glabrous. 
  The 
  dorsal 
  carina 
  of 
  the 
  fourth 
  

   and 
  fifth 
  somites 
  of 
  the 
  pleon 
  is 
  divided 
  by 
  a 
  narrow 
  incision. 
  Thetel- 
  

   son 
  is 
  shorter 
  than 
  thesixth 
  somite 
  and 
  rather 
  suddenly 
  tapered 
  to 
  a 
  

   short 
  acuminate 
  tip 
  armed 
  either 
  side 
  with 
  a 
  short 
  and 
  very 
  small 
  spine. 
  

  

  Hymenopenjeus 
  Smith. 
  

  

  Two 
  new 
  species 
  recently 
  described 
  (Proc. 
  National 
  Mus., 
  viii, 
  pp. 
  

   180, 
  183, 
  18S5) 
  confirm 
  the 
  distinctness 
  of 
  this 
  genus 
  aud 
  enable 
  me 
  to 
  

   state 
  its 
  characteristics 
  and 
  its 
  relations 
  to 
  the 
  allied 
  genera. 
  Both 
  

   flagella 
  of 
  the 
  antenuulai 
  are 
  slender 
  and 
  at 
  least 
  as 
  long 
  as 
  the 
  cara- 
  

  

  