﻿256 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM. 
  vol.44. 
  

  

  Family 
  LERNiEOPODID^. 
  

  

  Genus 
  THYSANOTE 
  Kr0yer. 
  

   THYSANOTE 
  POMACANTHI 
  Kr0yer. 
  

  

  Thysanote 
  pomacanthi 
  Kr0ter, 
  1863, 
  p. 
  288, 
  pi. 
  15, 
  figs. 
  la-i. 
  

  

  Host 
  and 
  record 
  of 
  specimens. 
  — 
  Kr0yer 
  obtained 
  half 
  a 
  score 
  of 
  speci- 
  

   mens 
  from 
  the 
  gills 
  of 
  the 
  Indian 
  or 
  flat-fish, 
  Poraacanthus 
  para, 
  from 
  

   the 
  Danish 
  West 
  Indies. 
  Upon 
  these 
  he 
  established 
  the 
  new 
  genus, 
  

   Thysanote, 
  and 
  the 
  new 
  species, 
  pomacanthi, 
  which 
  became 
  the 
  i-y?Q 
  

   of 
  the 
  genus. 
  

  

  Two 
  years 
  later 
  Heller 
  said 
  (1865, 
  p. 
  238) 
  that 
  Kr0yer's 
  genus 
  was 
  

   nothing 
  but 
  a 
  ''Brachiella" 
  with 
  numerous 
  processes 
  on 
  the 
  arms 
  and 
  

   posterior 
  body, 
  and 
  he 
  described 
  two 
  new 
  species 
  which 
  he 
  referred 
  to 
  

   the 
  genus 
  BrachieUa. 
  But 
  neither 
  Kr03^er 
  nor 
  Heller 
  found 
  the 
  males 
  

   of 
  the 
  species 
  they 
  described. 
  Nordmann, 
  however, 
  had 
  previously 
  

   described 
  and 
  figured 
  (1832, 
  p. 
  92, 
  pi. 
  8, 
  figs. 
  1 
  to 
  3) 
  both 
  sexes 
  of 
  

   "BrachieUa 
  impudica," 
  which 
  have 
  since 
  been 
  referred 
  to 
  the 
  genus 
  

   Thysanote 
  by 
  Bassett-Smith 
  (1899, 
  p. 
  497), 
  T. 
  Scott 
  (1900, 
  p. 
  169), 
  

   and 
  A. 
  Scott 
  (1904, 
  p. 
  123). 
  

  

  Steenstmp 
  and 
  Liitken 
  also 
  described 
  and 
  figured 
  (1861, 
  ]). 
  419, 
  

   pi. 
  15, 
  fig. 
  35) 
  both 
  sexes 
  of 
  "Brachiella 
  appendiculata," 
  which 
  evi- 
  

   dentl}^ 
  belongs 
  to 
  tliis 
  genus 
  Thysanote, 
  and 
  Bassett-Smith 
  described 
  

   and 
  figured 
  (1898, 
  p. 
  14, 
  pi. 
  6, 
  figs. 
  1 
  to 
  3) 
  both 
  sexes 
  of 
  "BrachieUa. 
  

   appendiculosa," 
  which 
  he 
  afterwards 
  acknowledged 
  (1899, 
  p. 
  497) 
  

   to 
  be 
  identical 
  with 
  Steenstrup 
  and 
  Liitken's 
  species. 
  

  

  These 
  last 
  two 
  males 
  corresponcj 
  with 
  the 
  one 
  here 
  described, 
  as 
  do 
  

   the 
  females, 
  and 
  may 
  therefore 
  be 
  taken 
  as 
  typical 
  of 
  the 
  genus. 
  

  

  There 
  are 
  far 
  more 
  differences 
  between 
  the 
  males 
  and 
  those 
  of 
  true 
  

   BrachieUa 
  species 
  than 
  there 
  are 
  between 
  the 
  females, 
  but 
  even 
  

   with 
  the 
  latter 
  the 
  differences 
  are 
  enough 
  to 
  estabhsh 
  the 
  vaUdity 
  

   of 
  the 
  genus. 
  There 
  is 
  no 
  one 
  tiling 
  besides 
  the 
  fimbriate 
  processes 
  

   which 
  can 
  be 
  regarded 
  as 
  a 
  conclusive 
  generic 
  character. 
  Rather 
  

   is 
  the 
  genus 
  distinguished 
  by 
  an 
  accumulation 
  of 
  small 
  and 
  not 
  very 
  

   prominent 
  differences, 
  which 
  ma}^ 
  be 
  summed 
  up 
  as 
  follows 
  : 
  

  

  Female. 
  — 
  Cephalothorax 
  short 
  and 
  tliickset, 
  and 
  in 
  the 
  same 
  fine 
  

   with 
  the 
  rest 
  of 
  the 
  body; 
  completely 
  fused 
  with 
  the 
  remainder 
  of 
  

   the 
  thorax 
  or 
  only 
  imperfectly 
  separated 
  ; 
  segmentation 
  indicated 
  by 
  

   breaks 
  in 
  the 
  musculature. 
  The 
  arms 
  (second 
  maxillae) 
  and 
  pos- 
  

   terior 
  margin 
  or 
  corners 
  of 
  the 
  body 
  bearing 
  fimbriate 
  processes; 
  no 
  

   abdomen, 
  anal 
  laminae 
  very 
  rudimentary. 
  

  

  First 
  antenna3 
  between 
  the 
  terminal 
  joints 
  of 
  the 
  second 
  pair 
  and 
  

   the 
  mouth, 
  visible 
  only 
  from 
  below, 
  indistinctly 
  segmented. 
  Second 
  

   pair 
  closely 
  appressed 
  to 
  the 
  frontal 
  margin 
  of 
  the 
  head 
  and 
  just 
  

   meeting 
  at 
  the 
  midhne; 
  mandibles 
  with 
  a 
  pronounced 
  curve 
  near 
  

   the 
  center 
  of 
  the 
  blade; 
  first 
  maxillae 
  large, 
  \vith 
  a 
  distinct 
  palp; 
  

  

  