﻿302 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol. 
  103 
  

  

  with 
  numerous 
  sand 
  grains 
  as 
  statoliths. 
  Color 
  : 
  In 
  life 
  : 
  Deep 
  orange 
  

   to 
  brownish 
  red. 
  In 
  alcohol: 
  Bluish 
  to 
  grayish 
  black 
  or 
  brown. 
  

  

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

   August 
  21, 
  24, 
  28, 
  September 
  6, 
  12, 
  19, 
  22, 
  October 
  16, 
  1949 
  (54 
  

   specimens); 
  off 
  Point 
  Barrow 
  base, 
  along 
  shore, 
  1.7 
  fms., 
  on 
  bottom 
  

   of 
  gravel 
  with 
  mud 
  (2 
  stations, 
  3 
  specimens) 
  . 
  

  

  Distribution. 
  — 
  Alaskan 
  and 
  Canadian 
  Arctic. 
  In 
  1.7-3 
  fathoms. 
  

  

  Family 
  Maldanidae 
  

  

  Body 
  cylindrical, 
  truncated 
  at 
  both 
  ends, 
  without 
  differentiated 
  

   regions, 
  segments 
  usually 
  few, 
  some 
  much 
  longer 
  than 
  wide. 
  Pro- 
  

   stomium 
  a 
  small 
  cephalic 
  crest 
  fused 
  with 
  achaetous 
  buccal 
  segment, 
  

   forming 
  ovoid 
  head, 
  without 
  appendages, 
  with 
  or 
  without 
  oblique 
  

   limbate 
  brim 
  or 
  plate 
  (fig. 
  34, 
  b, 
  i, 
  I) 
  ; 
  pair 
  of 
  nuchal 
  slits 
  on 
  either 
  side 
  

   cephalic 
  crest. 
  In 
  anterior 
  region 
  with 
  numerous 
  glandular 
  cells, 
  

   diffused 
  or 
  grouped 
  in 
  clear 
  bands 
  alternating 
  with 
  pigmented 
  rings. 
  

   Parapodia 
  biramous; 
  notopodia 
  with 
  capillary 
  setae; 
  neuropodia 
  with 
  

   projecting 
  tori 
  bearing 
  rows 
  of 
  crotchets 
  (fig. 
  34,/) 
  with 
  dentate 
  ros- 
  

   trum 
  and 
  rostral 
  hairs; 
  the 
  crotchets 
  may 
  be 
  replaced 
  by 
  few 
  stout 
  

   acicular 
  spines 
  on 
  first 
  few 
  setigers. 
  Without 
  dorsal 
  or 
  ventral 
  cirri; 
  

   usually 
  without 
  branchiae. 
  Pygidium 
  a 
  limbate 
  plate, 
  spatulate 
  or 
  

   funneUike 
  (fig. 
  34, 
  h, 
  j, 
  m). 
  Proboscis 
  eversible, 
  unarmed, 
  globular. 
  

   Live 
  in 
  tubes 
  in 
  sand 
  or 
  mud; 
  tube 
  cylindrical, 
  membranous, 
  covered 
  

   with 
  thin 
  to 
  thick 
  layer 
  of 
  mud, 
  sand, 
  gravel, 
  more 
  or 
  less 
  resistant. 
  

  

  Represented 
  by 
  four 
  genera 
  and 
  five 
  species 
  from 
  Point 
  Barrow. 
  All 
  

   the 
  genera 
  are 
  without 
  specialized 
  collarettes, 
  without 
  special 
  glandular 
  

   ventral 
  shield 
  on 
  setiger 
  8, 
  with 
  neuropodial 
  crotchets 
  in 
  single 
  rows. 
  

  

  Key 
  to 
  the 
  genera 
  of 
  Maldanidae 
  from 
  Point 
  Barrow 
  

  

  1. 
  Head 
  with 
  limbate 
  plate 
  (fig. 
  34, 
  h, 
  g) 
  2 
  

  

  Head 
  without 
  limbate 
  plate 
  (fig. 
  34, 
  i, 
  I). 
  With 
  1-2 
  stout 
  acicular 
  setae 
  in 
  

   neuropodia 
  of 
  first 
  3 
  setigers. 
  Pygidium 
  funnel-shaped 
  or 
  forming 
  concave 
  

   plate, 
  with 
  or 
  without 
  cirri; 
  anus 
  opening 
  on 
  surface 
  of 
  plate 
  3 
  

  

  2. 
  Head 
  with 
  low 
  cephalic 
  crest, 
  bordered 
  by 
  oblique 
  limbate 
  plate, 
  entire 
  or 
  

  

  notched 
  laterally 
  (fig. 
  34, 
  h, 
  c) 
  . 
  With 
  ventral 
  crotchets 
  beginning 
  on 
  setiger 
  1. 
  

   Pygidium 
  funnel-shaped, 
  bordered 
  with 
  cirri, 
  with 
  anus 
  in 
  center 
  of 
  somewhat 
  

  

  protruding 
  anal 
  cone 
  within 
  the 
  funnel 
  (fig. 
  34, 
  d) 
  Praxillella 
  (p. 
  303) 
  

  

  Head 
  with 
  middorsal 
  convex 
  cephalic 
  crest 
  or 
  keel, 
  bordered 
  by 
  limbate 
  plate, 
  

   divided 
  into 
  3 
  parts 
  by 
  2 
  deep 
  lateral 
  grooves 
  (fig. 
  34, 
  g). 
  Without 
  neuro- 
  

   setae 
  on 
  setiger 
  1 
  ; 
  crotchets 
  begin 
  on 
  setiger 
  2. 
  Pygidium 
  a 
  slightly 
  oblique 
  

   oval 
  plate, 
  bordered 
  by 
  rim 
  which 
  is 
  incised 
  laterally, 
  smooth 
  or 
  denticled; 
  

   anus 
  dorsal 
  to 
  pygidial 
  disc 
  (fig. 
  34, 
  h) 
  Maldane 
  (p. 
  303) 
  

  

  3. 
  Pygidium 
  sHghtly 
  obhque, 
  funnel-shaped, 
  bordered 
  with 
  cirri 
  (fig. 
  34, 
  j, 
  k). 
  

  

  Nicomache 
  (p. 
  304) 
  

  

  Pygidium 
  an 
  asj'^mmetrical, 
  foliaceous, 
  concave 
  plate, 
  reduced 
  dorsally, 
  wider 
  

  

  ventrally, 
  with 
  border 
  smooth 
  or 
  crenulate 
  (fig. 
  34, 
  m) 
  .Petaloproctus 
  (p. 
  306) 
  

  

  