﻿MARINE 
  POLYCHAETE 
  WORMS 
  — 
  PETTIBONE 
  293 
  

  

  Greenland: 
  1 
  mile 
  northwest 
  Conical 
  Rock, 
  25-60 
  fms., 
  Bartlett, 
  

   1938. 
  Bering 
  Sea: 
  Albatross 
  Sta. 
  3223, 
  54°26' 
  N., 
  165°32' 
  W., 
  

   56 
  fms., 
  1890; 
  Bering 
  Strait, 
  13 
  fms., 
  Dall, 
  1880. 
  Alaska: 
  Iliuliuk 
  

   Harbor, 
  Unalaska, 
  1871, 
  and 
  New 
  Harbor, 
  Unga 
  Island, 
  under 
  stones, 
  

   1872, 
  Dall; 
  Kodiak, 
  W. 
  J. 
  Fisher. 
  East 
  Coast 
  North 
  America: 
  

   Off 
  Labrador, 
  95 
  fms.. 
  Blue 
  Dolphin 
  'Eixpedition, 
  1949; 
  Bay 
  of 
  Fmidy, 
  

   Maine, 
  48-90 
  fms., 
  U. 
  S. 
  Fish 
  Commission. 
  

  

  Distribution. 
  — 
  Widely 
  distributed 
  in 
  the 
  Arctic: 
  Siberian, 
  Alaskan, 
  

   and 
  Canadian 
  Arctic, 
  Davis 
  Strait, 
  Greenland, 
  Novaya 
  Zemlya,Kara 
  

   Sea. 
  Also 
  Iceland, 
  Faroes, 
  Norway 
  to 
  Danish 
  waters; 
  Labrador 
  to 
  

   Maine; 
  Bering 
  Sea 
  to 
  Gulf 
  of 
  Alaska; 
  north 
  Japan 
  Sea. 
  In 
  low 
  water 
  

   to 
  609 
  fathoms. 
  

  

  Family 
  Scalibregmidae 
  

  

  Body 
  inflated 
  anteriorly 
  or 
  short, 
  fusiform. 
  Integument 
  roughened 
  

   or 
  tesseiated 
  and 
  divided 
  into 
  superficial 
  rings. 
  Prostomium 
  small, 
  

   bilobed, 
  or 
  entire 
  and 
  with 
  frontal 
  horns; 
  two 
  ciliated 
  evaginable 
  

   nuchal 
  grooves 
  on 
  each 
  side 
  of 
  prostomium 
  (fig. 
  33, 
  i). 
  Buccal 
  

   segment 
  achaetous. 
  Parapodia 
  biramous, 
  rami 
  small, 
  with 
  or 
  without 
  

   dorsal 
  and 
  ventral 
  cirri. 
  Setae 
  simple, 
  capillary, 
  some 
  single, 
  some 
  

   forked. 
  Branchiae 
  limited 
  to 
  anterior 
  few 
  segments 
  (may 
  be 
  absent). 
  

   Pygidium 
  with 
  or 
  without 
  anal 
  cirri. 
  Proboscis 
  eversible, 
  unarmed, 
  

   globular, 
  smooth. 
  

  

  Represented 
  by 
  a 
  single 
  species 
  from 
  Point 
  Barrow. 
  

  

  Genus 
  Scalibregma 
  Rathke, 
  1843 
  

   Scalihregma 
  inflatum 
  Rathke, 
  1843 
  

  

  FiGUEE 
  33, 
  i-k 
  

  

  Scalibregma 
  inflatum 
  Rathke, 
  1843, 
  p. 
  184, 
  pi. 
  9, 
  figs. 
  15-21. 
  — 
  Moore, 
  1923, 
  

   p. 
  217.— 
  Fauvel, 
  1927, 
  p. 
  123, 
  fig. 
  44, 
  a-f 
  ; 
  1932, 
  p. 
  187; 
  1934a, 
  p. 
  50.— 
  

   Augener, 
  1928, 
  p. 
  754.— 
  Monro, 
  1930, 
  p. 
  163.— 
  Annenkova, 
  1934, 
  p. 
  322; 
  

   1937, 
  p. 
  176; 
  1938, 
  p. 
  186.— 
  Okuda, 
  1938b, 
  p. 
  99.— 
  Hartman, 
  1944a, 
  pp. 
  

   336, 
  341; 
  1948, 
  p. 
  40.— 
  St0p-Bowitz, 
  1946, 
  p. 
  67, 
  fig. 
  2; 
  1948b, 
  p. 
  24, 
  fig. 
  8.— 
  

   Zatsepin, 
  1948, 
  p. 
  136, 
  pi. 
  33, 
  fig. 
  10.— 
  Wesenberg-Lund, 
  1950a, 
  p. 
  36; 
  

   1950b, 
  p. 
  86; 
  1951, 
  p. 
  81.— 
  Berkeley 
  and 
  Berkeley, 
  1952, 
  p. 
  58, 
  figs. 
  119-121. 
  

  

  Scalibregma 
  brevicauda 
  Verrill, 
  1873, 
  pp. 
  416, 
  422, 
  605; 
  1881, 
  p. 
  302, 
  pi. 
  9, 
  fig. 
  5. 
  

  

  Scalibregma 
  minutum 
  Webster 
  and 
  Benedict, 
  1887, 
  p. 
  727. 
  

  

  Description. 
  — 
  ^Length 
  up 
  to 
  100 
  mm., 
  width 
  13 
  mm., 
  45-60 
  segments 
  

   (two 
  specimens 
  washed 
  ashore 
  after 
  a 
  storm 
  were 
  longer 
  than 
  any 
  

   previously 
  recorded). 
  Body 
  divided 
  into 
  two 
  more 
  or 
  less 
  distinct 
  

   regions, 
  anterior 
  inflated 
  portion 
  (anterior 
  15-17 
  setigers) 
  tapered 
  

   anteriorly, 
  without 
  dorsal 
  and 
  ventral 
  cirri, 
  and 
  narrower 
  attenuated 
  

   posterior 
  region 
  with 
  dorsal 
  and 
  ventral 
  cirri. 
  A 
  more 
  or 
  less 
  devel- 
  

  

  