﻿78 
  DR. 
  G. 
  C. 
  BOURNE 
  ON 
  THE 
  RANINID^E 
  : 
  

  

  Fi°\ 
  17. 
  Thoracic 
  skeleton 
  of 
  No/opus 
  dorsipes 
  seen 
  from 
  the 
  left 
  side, 
  illustrating 
  the 
  great 
  

   depth 
  of 
  the 
  epimera 
  and 
  the 
  oblique 
  raised 
  ridge 
  on 
  the 
  11th, 
  12th, 
  and 
  13th 
  

   epimera, 
  against 
  which 
  the 
  lower 
  margin 
  of 
  the 
  branchiostegite 
  fits: 
  ix, 
  x, 
  the 
  

   ninth 
  and 
  tenth 
  sterna 
  ; 
  vi/vii 
  to 
  ix/x. 
  intersegmental 
  arthrophragms. 
  

  

  Fig. 
  18. 
  Frontal 
  view 
  of 
  the 
  thoracic 
  skeleton 
  of 
  Notopus 
  dorsipes. 
  The 
  articular 
  socket 
  of 
  

   the 
  second 
  maxilla 
  of 
  the 
  left 
  side 
  is 
  omit-ted. 
  

  

  Fig. 
  19. 
  The 
  antennary 
  region 
  of 
  Nephrops 
  norvegicus. 
  The 
  rostrum 
  is 
  cut 
  short 
  and 
  the 
  eyes, 
  

   antenuules, 
  and 
  antennas 
  are 
  removed 
  from 
  their 
  sockets, 
  i. 
  The 
  membranous 
  

   ocular 
  sternum 
  ; 
  ii. 
  the 
  antennulary 
  sternum 
  ; 
  iii. 
  the 
  antennary 
  sternum 
  ; 
  iv. 
  the 
  

   mandibular 
  sternum; 
  ii/iii. 
  the 
  arthrophragm 
  between 
  the 
  antennulary 
  and 
  

   antennary 
  fossas. 
  .r. 
  sclerite 
  identified 
  as 
  the 
  mandibular 
  epimerou. 
  

  

  Fig. 
  20. 
  Side 
  view 
  of 
  the 
  ocular 
  and 
  the 
  antennary 
  regions 
  of 
  Nephrops 
  norvegicus. 
  The 
  

   rostrum 
  is 
  cut 
  short 
  and 
  the 
  antenuules 
  and 
  antennas 
  are 
  removed, 
  oc.t. 
  sclerite 
  

   representing 
  the 
  tergum 
  of 
  the 
  ocular 
  segment; 
  i. 
  the 
  sternum 
  of 
  the 
  ocular 
  

   segment 
  : 
  the 
  epimera 
  of 
  this 
  segment 
  are 
  membranous. 
  

  

  Fi»\ 
  21. 
  Antennary 
  region 
  and 
  buccal 
  frame 
  of 
  JEthusina 
  gracilipes, 
  Miers. 
  Ep. 
  iv. 
  epimeron 
  

   of 
  the 
  mandibular 
  segment. 
  

  

  Fin 
  - 
  . 
  22. 
  Antennary 
  region 
  and 
  buccal 
  frame 
  of 
  Notojms 
  dorsipes. 
  The 
  appendages 
  have 
  been 
  

   removed, 
  with 
  the 
  exception 
  of 
  the 
  right 
  ocular 
  peduncle 
  and 
  the 
  left 
  mandible. 
  

   A 
  u 
  A 
  2) 
  sockets 
  of 
  the 
  antenuules 
  and 
  autenna? 
  ; 
  pgt. 
  sub-antennary 
  lobe 
  of 
  the 
  

   pt.erygostome. 
  

  

  Fi<>\ 
  23. 
  A 
  similar 
  view 
  of 
  the 
  antennary 
  region 
  and 
  buccal 
  frame 
  of 
  Ranina 
  dentata. 
  

  

  Plate 
  6. 
  

  

  Fig. 
  24. 
  A 
  similar 
  view 
  of 
  the 
  antennary 
  region 
  and 
  buccal 
  frame 
  of 
  Notosceles 
  chimmonis. 
  

   Fig. 
  25. 
  A 
  similar 
  view 
  of 
  the 
  antennary 
  region 
  and 
  buccal 
  frame 
  of 
  Lyreidus 
  tridentatus, 
  

  

  showing 
  the 
  great 
  elongation 
  of 
  the 
  antennary 
  sternum 
  iii. 
  pgl. 
  paraglessas. 
  

   Fig. 
  26. 
  Perspective 
  sketch 
  of 
  the 
  buccal 
  frame 
  of 
  Ranina 
  dentata, 
  to 
  show 
  the 
  hood-shaped 
  

  

  mandibular 
  sternum 
  iv. 
  

   Fi°\ 
  27. 
  Antennary 
  region 
  and 
  buccal 
  frame 
  of 
  Dromia 
  vulgaris. 
  The 
  appendages 
  have 
  been 
  

  

  removed, 
  with 
  the 
  exception 
  of 
  the 
  right 
  ocular 
  peduncle. 
  

   Figs. 
  28-33. 
  Notopus 
  dorsipes. 
  Fig. 
  28. 
  Eight 
  antennule 
  : 
  admedian 
  aspect. 
  

   Fi°s. 
  29 
  & 
  29 
  a. 
  Right 
  antenna, 
  admedian 
  and 
  outer 
  aspects. 
  1-5, 
  segments 
  of 
  the 
  peduncle. 
  

   Fig. 
  30. 
  Second 
  maxilla 
  with 
  scaphognathite. 
  

   Fio\ 
  31. 
  First 
  maxilliped. 
  Fig. 
  32. 
  Second 
  maxilliped 
  : 
  note 
  the 
  relatively 
  large 
  flagellum 
  

  

  of 
  the 
  exopodite. 
  Fig. 
  33. 
  Third 
  maxilliped 
  : 
  note 
  the 
  oblique 
  line 
  of 
  hairs 
  on 
  

  

  the 
  ischium 
  also 
  seen 
  in 
  Ra?iilia, 
  M. 
  Edw. 
  

   Fig. 
  34, 
  outer 
  and 
  Fig. 
  34 
  a, 
  admedian 
  views 
  of 
  the 
  right 
  antennule 
  of 
  Ranina 
  dentata. 
  

  

  Note 
  the 
  external 
  opening 
  of 
  the 
  statocyst, 
  scy. 
  

   Fi°\ 
  35, 
  outer 
  and 
  Fig. 
  35 
  a, 
  admedian 
  views 
  of 
  the 
  right 
  antenna 
  of 
  Ranina 
  dentata. 
  

  

  1-5, 
  segments 
  of 
  peduncle. 
  

   Fig. 
  36. 
  Outer 
  aspect 
  of 
  the 
  right 
  antennule 
  of 
  Raninoides 
  personatus. 
  Note 
  the 
  infolding 
  

  

  of 
  the 
  cuticle 
  to 
  form 
  the 
  statocyst, 
  and 
  the 
  external 
  aperture 
  of 
  the 
  latter 
  at 
  scy. 
  

   Fig. 
  37. 
  Admedian 
  view 
  of 
  the 
  right 
  antenna 
  of 
  Raninoides 
  personatus. 
  In 
  this 
  genus 
  and 
  

  

  in 
  Lyreidtis 
  the 
  two 
  basal 
  segments 
  of 
  the 
  peduncle 
  are 
  indistinguishably 
  fused 
  

  

  together. 
  

   Fig. 
  38. 
  Admedian 
  view 
  of 
  right 
  antennule 
  of 
  Lyreidus 
  tridentatus. 
  

   Fig. 
  39. 
  Admedian 
  view 
  of 
  right 
  antenna 
  of 
  Lyreidus 
  tridentatus. 
  

   Fig. 
  40. 
  Admedian 
  view 
  of 
  right 
  autennule 
  of 
  Notosceles 
  chimmonis. 
  

  

  Fig. 
  41, 
  outer 
  and 
  Fig. 
  41 
  a, 
  admedian 
  views 
  of 
  the 
  right 
  antenna 
  of 
  Notosceles 
  chimmonis. 
  

   Fig. 
  43. 
  Notosceles 
  chimmonis. 
  Third 
  maxilliped. 
  

  

  