﻿Gatty 
  Marine 
  Lahoralory^ 
  St. 
  Andrews. 
  83 
  

  

  In 
  his 
  original 
  descriptiim 
  Malmgren 
  describes 
  the 
  branchiae 
  

   as 
  four 
  pairs, 
  the 
  basal 
  re^jion 
  of 
  the 
  long 
  tapering 
  forms 
  as 
  

   pinnate, 
  the 
  distal 
  as 
  filiform 
  (referiing 
  to 
  the 
  elongate 
  

   pinnate 
  organs 
  of 
  the 
  front 
  and 
  rear 
  of 
  the 
  anterior 
  region). 
  

   He, 
  however, 
  observes 
  that 
  these 
  are 
  longer 
  than 
  the 
  branchiae 
  

   of 
  his 
  second 
  and 
  third 
  segments 
  (for 
  he 
  apparently 
  over- 
  

   looked 
  the 
  minute 
  anterior'feet), 
  yet 
  he 
  does 
  not 
  diftereutiate 
  

   these 
  from 
  the 
  dorsal 
  lamellae 
  of 
  the 
  feet, 
  which 
  are 
  truly 
  

   lanceolate, 
  whilst 
  the 
  true 
  branchiae, 
  which 
  he 
  apparently 
  

   represents 
  in 
  his 
  fig. 
  55 
  A, 
  Taf. 
  x., 
  are 
  broadly 
  strap-shaped, 
  

   only 
  a 
  little 
  tapered 
  at 
  the 
  tip, 
  which 
  ends 
  in 
  a 
  conical 
  

   process 
  or 
  mucro. 
  Moreover, 
  they 
  are 
  closely 
  striated 
  trans- 
  

   versely 
  and 
  richly 
  ciliated, 
  whereas 
  the 
  pinnate 
  processes 
  and 
  

   the 
  lamellae 
  of 
  the 
  feet 
  are 
  not. 
  Claparede, 
  again, 
  expressed 
  

   doubt 
  as 
  to 
  the 
  actual 
  number 
  of 
  branchise, 
  from 
  the 
  facility 
  

   with 
  which 
  these 
  delicate 
  organs 
  break 
  off. 
  He, 
  however, 
  

   considered 
  the 
  pinnate 
  cirri 
  as 
  branchise, 
  though 
  he 
  found 
  no 
  

   cilia 
  on 
  them. 
  In 
  his 
  figure 
  (pi, 
  xxii. 
  fig- 
  3) 
  none 
  of 
  the 
  

   ligulate 
  (true) 
  branchiae 
  are 
  shown, 
  and 
  the 
  position 
  of 
  the 
  

   posterior 
  pair 
  of 
  the 
  pinnate 
  cirri 
  is 
  faulty. 
  

  

  In 
  the 
  first 
  foot 
  the 
  dorsal 
  and 
  ventral 
  lamellae 
  are 
  rounded 
  

   and 
  rudimentary, 
  and 
  the 
  tufts 
  of 
  bristles 
  small 
  ; 
  moreover, 
  

   the 
  granular 
  condition 
  of 
  the 
  axis 
  of 
  the 
  bristle 
  was 
  not 
  made 
  

   out. 
  The 
  second 
  foot 
  has 
  the 
  dorsal 
  lamella 
  of 
  a 
  lanceolate 
  

   outline, 
  whilst 
  the 
  ventral 
  is 
  rounded. 
  Both 
  dorsal 
  and 
  

   ventral 
  bristles 
  showed 
  a 
  granular 
  condition 
  of 
  the 
  axis, 
  so 
  

   that 
  it 
  (axis) 
  appeared 
  to 
  have 
  minute 
  transverse 
  bars 
  in 
  the 
  

   centre 
  (PI. 
  VI. 
  fig. 
  6). 
  

  

  In 
  the 
  third, 
  fourth, 
  and 
  fifth 
  feet 
  the 
  dorsal 
  lamella 
  

   largely 
  increases 
  in 
  size 
  as 
  a 
  broadly 
  lanceolate 
  process, 
  but 
  

   in 
  the 
  third 
  and 
  fourth 
  it 
  is 
  considerably 
  Ijess 
  than 
  the 
  

   elongate 
  branchia 
  which 
  forms 
  a 
  conspicuous 
  process 
  on 
  the 
  

   inner 
  side 
  of 
  each, 
  and 
  readily 
  distinguished 
  by 
  the 
  trans- 
  

   verse 
  lines. 
  These 
  branchiae 
  are 
  much 
  longer 
  than 
  those 
  in 
  

   the 
  Canadian 
  form, 
  and 
  the 
  tip 
  differs 
  in 
  its 
  tapered 
  con- 
  

   dition. 
  They 
  are 
  also 
  proportionally 
  larger 
  and 
  longer 
  than 
  

   in 
  the 
  P, 
  plumosa 
  of 
  Sars. 
  The 
  first 
  ten 
  segments 
  are 
  con^ 
  

   spicuously 
  bristled, 
  the 
  strongly 
  curved 
  dorsal 
  and 
  ventral 
  

   bristles 
  projecting 
  laterally 
  in 
  front 
  of 
  tiie 
  lamellae. 
  The 
  

   eleventh 
  has 
  more 
  slender 
  capillary 
  bristles. 
  Claparede 
  

   stated 
  that 
  the 
  hooks 
  commenced 
  on 
  the 
  fitteenth 
  segment, 
  

   but 
  Mr. 
  Southern 
  described 
  them 
  on 
  the 
  twelfth 
  bristled 
  

   segment. 
  When 
  this 
  feature 
  was 
  examined 
  the 
  specimens 
  

   were 
  much 
  injured, 
  so 
  that 
  exactitude 
  was 
  not 
  possible, 
  

   They 
  seemed 
  to 
  begin 
  about 
  the 
  fourteenth 
  or 
  fifteenth, 
  

  

  The 
  three 
  forms 
  mentioned 
  above, 
  vi%., 
  Malmgren's, 
  Sars's^ 
  

  

  

  

  