﻿432 
  On 
  the 
  Polyzoa 
  of 
  the 
  St. 
  Lawrence. 
  

  

  the 
  Yorkshire 
  coast, 
  where 
  I 
  met 
  with 
  it 
  abundantly 
  on 
  some 
  

   of 
  the 
  Crisiidre. 
  I 
  have 
  also 
  found 
  it 
  in 
  Lamlash 
  Bay 
  and 
  on 
  

   a 
  Cellularia 
  from 
  Shetland 
  (probably). 
  These 
  were 
  the 
  only 
  

   known 
  localities 
  for 
  it. 
  It 
  now 
  proves 
  to 
  be 
  abundant 
  

   amongst 
  the 
  St. 
  -Lawrence 
  dredgings 
  on 
  Crista, 
  which 
  seems 
  

   to 
  be 
  its 
  favourite 
  habitat. 
  It 
  takes 
  its 
  place 
  amongst 
  the 
  

   Northern 
  forms 
  which 
  have 
  migrated 
  to 
  our 
  coasts 
  by 
  way 
  of 
  

   Shetland. 
  

  

  Family 
  Pedicellinidse, 
  Hincks. 
  

   Pedicellina, 
  Sars. 
  

  

  Pedicellina 
  nutans, 
  Dalyell. 
  (PI. 
  XXI. 
  fig. 
  9.) 
  

  

  The 
  form 
  which 
  I 
  have 
  identified 
  with 
  Dalyell's 
  species 
  * 
  

   occurs 
  plentifully 
  and 
  of 
  large 
  size 
  in 
  the 
  St. 
  Lawrence 
  ; 
  and 
  

   a 
  further 
  examination 
  of 
  it 
  has 
  confirmed 
  me 
  in 
  my 
  opinion 
  

   that 
  it 
  is 
  specifically 
  distinct 
  from 
  P. 
  cernua. 
  

  

  Jullien 
  t 
  has 
  questioned 
  the 
  validity 
  of 
  this 
  species 
  and 
  

   considers 
  that 
  it 
  may 
  probably 
  be 
  no 
  more 
  than 
  a 
  variety 
  of 
  

   P. 
  cernua. 
  But 
  he 
  has 
  hardly 
  done 
  justice 
  to 
  the 
  characters 
  

   upon 
  which 
  1 
  rely 
  as 
  distinctive. 
  The 
  small 
  size 
  compara- 
  

   tively 
  of 
  the 
  zocecium 
  and 
  the 
  constriction 
  of 
  the 
  pedicel 
  

   below 
  it 
  are 
  by 
  no 
  means 
  the 
  only 
  points 
  nor 
  yet 
  the 
  most 
  

   significant 
  in 
  which 
  it 
  differs 
  from 
  the 
  latter 
  species. 
  I 
  have 
  

   insisted 
  on 
  the 
  remarkable 
  difference 
  between 
  the 
  shape 
  of 
  the 
  

   body 
  in 
  the 
  two 
  forms, 
  which 
  is 
  well 
  shown 
  in 
  my 
  woodcuts, 
  

   figs. 
  '69 
  and 
  40, 
  as 
  a 
  most 
  important 
  character. 
  There 
  is 
  a 
  

   group 
  of 
  distinctive 
  characters 
  which, 
  in 
  my 
  judgment, 
  amply 
  

   justifies 
  my 
  view. 
  The 
  very 
  characteristic 
  pedicel 
  (broad 
  

   below 
  and 
  tapering 
  rapidly 
  upward 
  to 
  a 
  subacuminate 
  extre- 
  

   mity), 
  the 
  constant 
  absence 
  of 
  spines, 
  the 
  symmetrical 
  vase- 
  

   like 
  body, 
  destitute 
  of 
  the 
  gibbosity 
  on 
  the 
  dorsal 
  side, 
  so 
  cha- 
  

   racteristic 
  of 
  P. 
  cernua, 
  are 
  significant 
  points 
  of 
  difference 
  

   which 
  prevent 
  me 
  from 
  accepting 
  Dr. 
  Jullien's 
  criticism. 
  

  

  The 
  Pedicellinidee 
  abound 
  in 
  the 
  Northern 
  seas. 
  The 
  St.- 
  

   Lawrence 
  dredgings 
  have 
  already 
  yielded 
  P. 
  nutans, 
  Pallas, 
  

   Barentsia 
  major, 
  a 
  fine 
  new 
  species 
  described 
  in 
  my 
  last 
  

   paper, 
  and 
  B. 
  gracilis, 
  Sars. 
  B. 
  bulbosa, 
  Hincks, 
  is 
  a 
  native 
  

   of 
  Barents 
  Sea. 
  

  

  I 
  have 
  figured 
  B. 
  gracilis 
  (PI. 
  XXI. 
  fig. 
  10) 
  for 
  com- 
  

   parison 
  with 
  B. 
  major 
  (' 
  Annals 
  ' 
  for 
  March 
  1888, 
  pi. 
  xv. 
  

   fig. 
  2) 
  and 
  also 
  to 
  show 
  the 
  great 
  variability 
  in 
  the 
  length 
  of 
  

   the 
  muscular 
  cylinder. 
  

  

  * 
  ' 
  British 
  Marine 
  Polyzoa,' 
  vol. 
  i. 
  p. 
  567, 
  woodcuts 
  figs. 
  37,88, 
  and 
  40. 
  

   f 
  • 
  Bryozoaires 
  recueillis 
  par 
  la 
  Mission 
  du 
  Cap 
  Horn/ 
  pp. 
  1-10. 
  

  

  