﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  271 
  

  

  Description. 
  — 
  Length 
  115-300 
  mm., 
  width 
  without 
  setae 
  9-12 
  mm. 
  

   Dorsal 
  pair 
  tentacular 
  cuTi 
  about 
  half 
  as 
  large 
  as 
  ventral 
  pair. 
  

   Branchiae 
  begin 
  on 
  setiger 
  6, 
  at 
  first 
  a 
  small 
  swelling 
  on 
  the 
  lower 
  side 
  

   of 
  the 
  base 
  of 
  the 
  flattened, 
  triangular 
  dorsal 
  cirrus, 
  gradually 
  becom- 
  

   ing 
  larger; 
  where 
  best 
  developed, 
  they 
  are 
  inflated 
  on 
  the 
  basal 
  half, 
  

   with 
  the 
  distal 
  half 
  more 
  slender, 
  digitiform 
  and 
  slightly 
  recurved 
  or 
  

   hooked; 
  they 
  are 
  smaller 
  and 
  rudimentary 
  only 
  on 
  posterior 
  half 
  of 
  

   body. 
  Notopodial 
  acicular 
  lobes 
  of 
  anterior 
  and 
  middle 
  region 
  

   unequally 
  bilobed, 
  the 
  upper 
  one 
  wider 
  and 
  shorter 
  and 
  the 
  ventral 
  

   one 
  narrower 
  and 
  longer; 
  rounded 
  in 
  posterior 
  region. 
  Neuropodial 
  

   acicular 
  lobes 
  slightly 
  bilobed 
  in 
  anterior 
  region; 
  very 
  low 
  and 
  rounded 
  

   in 
  middle 
  and 
  posterior 
  regions 
  (not 
  very 
  distinct 
  from 
  posterior 
  

   lamellae). 
  Color: 
  In 
  alcohol: 
  Brownish. 
  

  

  Remarks. 
  — 
  The 
  type 
  of 
  N. 
  rickettsi 
  Hartman 
  from 
  Alaska 
  was 
  

   compared 
  with 
  a 
  specimen 
  of 
  A^. 
  discors 
  from 
  Bay 
  of 
  Fundy 
  and 
  is 
  

   herein 
  referred 
  to 
  the 
  latter 
  species. 
  

  

  New 
  records. 
  — 
  Arctic 
  Alaska: 
  Point 
  Barrow 
  base, 
  washed 
  ashore; 
  

   off 
  Point 
  Barrow 
  base, 
  up 
  to 
  12.1 
  miles 
  from 
  shore, 
  24.7-123.5 
  fms., 
  

   on 
  bottoms 
  of 
  mud, 
  gravel-mud, 
  stones 
  and 
  large 
  perforated 
  rocks, 
  

   and 
  mass 
  of 
  worm 
  tubes 
  (5 
  stations, 
  5 
  specimens). 
  West 
  Coast 
  

   North 
  America: 
  Puget 
  and 
  Washington 
  Sounds, 
  70-83 
  fms., 
  mud 
  

   (3 
  specimens), 
  Pettibone, 
  1938, 
  1939. 
  East 
  Coast 
  North 
  America: 
  

   Bay 
  of 
  Fundy, 
  U. 
  S. 
  Fish 
  Commission. 
  

  

  Distribution. 
  — 
  Alaskan 
  Arctic 
  to 
  southern 
  California; 
  Bay 
  of 
  Fundy 
  

   to 
  Maine. 
  In 
  24-268 
  fathoms. 
  

  

  Nephtys 
  paradoxa 
  Malm, 
  1874 
  

  

  Figure 
  30, 
  j, 
  k 
  

  

  Nephthys 
  paradoxa 
  Malm, 
  1874, 
  p. 
  78, 
  pi. 
  1, 
  fig. 
  2. 
  — 
  Fauvel, 
  1923, 
  p. 
  375, 
  fig. 
  

   146, 
  f-i.— 
  Augener, 
  1928, 
  p. 
  701.— 
  Gustafson, 
  1936, 
  p. 
  7.— 
  Annenkova, 
  1938, 
  

   p. 
  163.— 
  Friedrich, 
  1939, 
  p. 
  123.— 
  Berkeley 
  and 
  Berkeley, 
  1943, 
  p. 
  130.— 
  

   Wesenberg-Lund, 
  1950a, 
  p. 
  22; 
  1950b, 
  p. 
  61; 
  1951, 
  p. 
  47. 
  

  

  Nephthys 
  phyllobranchia 
  Mcintosh, 
  1885, 
  p. 
  164, 
  pi. 
  26, 
  fig. 
  10; 
  pi. 
  27, 
  fig. 
  3; 
  pi. 
  

   14, 
  A, 
  figs. 
  12, 
  13. 
  

  

  ? 
  Nephthys 
  brachycephala 
  Moore, 
  1903, 
  p. 
  431. 
  — 
  Annenkova, 
  1937, 
  p. 
  164; 
  1938, 
  

   p. 
  162.— 
  Zatsepin, 
  1948, 
  p. 
  121, 
  pi. 
  30, 
  fig. 
  9. 
  

  

  Nephtys 
  paradoxa 
  Hartman, 
  1944a, 
  pp. 
  335, 
  339, 
  pi. 
  15, 
  fig. 
  6; 
  1950, 
  p. 
  111. 
  

  

  Nephtys 
  phyllobranchia 
  Hartman, 
  1950, 
  p. 
  111. 
  

  

  Description. 
  — 
  Length 
  150-200 
  mm., 
  width 
  without 
  setae 
  8-13 
  mm. 
  

   Dorsal 
  pair 
  tentacular 
  cirri 
  reduced 
  to 
  a 
  tubercle, 
  smaller 
  than 
  ventral 
  

   pair. 
  Branchiae 
  begin 
  on 
  setigers 
  11-13 
  (8-14), 
  very 
  short, 
  triangular 
  

   at 
  first, 
  gradually 
  becoming 
  larger; 
  where 
  best 
  developed, 
  they 
  are 
  

   flat, 
  wide 
  foliaceous, 
  weakly 
  to 
  distinctly 
  concave; 
  they 
  are 
  small, 
  

   nearly 
  absent 
  on 
  the 
  last 
  15-30 
  segments. 
  The 
  anterior 
  acicular 
  

   lobes 
  are 
  rounded; 
  those 
  of 
  the 
  middle 
  and 
  posterior 
  regions 
  are 
  

   conical, 
  pointed. 
  The 
  postsetal 
  lamellae 
  in 
  the 
  anterior 
  region 
  are 
  

  

  