﻿A 
  STUDY 
  IN 
  CARCINOLOGV. 
  77 
  

  

  Plate 
  4. 
  

  

  Fig. 
  1. 
  Ventral 
  view 
  of 
  Notopus 
  dorsipes, 
  de 
  Ilaan. 
  The 
  chelipeds 
  have 
  heen 
  turned 
  

   outwards 
  and 
  the 
  pereiopods 
  are 
  extended 
  to 
  show 
  their 
  structure 
  as 
  far 
  as 
  

   possible. 
  

  

  Fig. 
  2. 
  Dorsal 
  view 
  of 
  Notosceles 
  chimmonis, 
  no 
  v. 
  gen. 
  et 
  sp. 
  The 
  chelipeds 
  and 
  pereiopods 
  

   have 
  been 
  extended 
  as 
  in 
  tig. 
  1. 
  

  

  Fig. 
  3. 
  Ventral 
  view 
  of 
  Notosceles 
  chimmonis. 
  

  

  Fig. 
  4. 
  Ventral 
  view 
  of 
  Lyreidus 
  tridentatus, 
  de 
  Haau. 
  Note 
  the 
  elongated 
  digging 
  dactyli 
  

   of 
  the 
  first 
  and 
  second 
  pereiopods. 
  

  

  Fi°\ 
  5. 
  Dorsal 
  view 
  of 
  Raninoides 
  personatus, 
  White 
  MS., 
  Henderson. 
  The 
  first 
  and 
  third 
  

   pereiopods 
  of 
  the 
  left 
  side 
  are 
  missing. 
  

  

  Fig. 
  6. 
  Ventral 
  view 
  of 
  the 
  same 
  specimen 
  as 
  tig. 
  5. 
  Note 
  the 
  large 
  size 
  of 
  the 
  sternal 
  

   plastron, 
  due 
  to 
  the 
  great 
  enlargement 
  of 
  sternum 
  xii 
  and 
  the 
  adaptation 
  of 
  the 
  

   second 
  and 
  third 
  pereiopods 
  for 
  swimming. 
  

  

  Fig. 
  7. 
  Left 
  side 
  view 
  of 
  Notopus 
  dorsipes. 
  The 
  first 
  three 
  pairs 
  of 
  pereiopods 
  have 
  been 
  

   pulled 
  downwards 
  to 
  show 
  the 
  large 
  extent 
  of 
  epimera 
  xi 
  and 
  xii 
  left 
  uncovered 
  

   by 
  the 
  edge 
  of 
  the 
  branchiostegite. 
  

  

  Fio-. 
  8. 
  Central 
  nervous 
  system 
  of 
  Ranina 
  dentata. 
  i. 
  ocular, 
  ii. 
  antennulary, 
  iii. 
  antennary 
  

   nerves; 
  iv. 
  mandibular 
  nerves; 
  v-ix. 
  nerves 
  to 
  maxillae 
  and 
  maxillipeds 
  issuing 
  

   from 
  the 
  subcesophageal 
  ganglion 
  ; 
  x. 
  ganglion 
  of 
  cheliped 
  ; 
  xi-xiv. 
  ganglia 
  of 
  

   the 
  four 
  posterior 
  thoracic 
  segments; 
  xv-xx. 
  ganglia 
  of 
  the 
  abbreviated 
  

   abdominal 
  nerve 
  chain, 
  st.a. 
  aperture 
  for 
  passage 
  of 
  the 
  sternal 
  artery. 
  

  

  Fi"\ 
  9. 
  Right 
  half 
  of 
  the 
  endophragmal 
  skeleton 
  of 
  Ranina 
  dentata 
  as 
  seen 
  from 
  within 
  

   after 
  division 
  into 
  two 
  halves 
  by 
  a 
  sagittal 
  cat. 
  The 
  more 
  anterior 
  thoracic 
  

   somites 
  are 
  omitted. 
  The 
  thoracic 
  portion 
  of 
  the 
  central 
  nervous 
  system 
  is 
  

   shown 
  in 
  situ. 
  Note 
  the 
  great 
  depth 
  of 
  the 
  sagittal 
  apodemes 
  of 
  sterna 
  xii, 
  xiii, 
  

   and 
  xiv. 
  g. 
  \\-g. 
  14, 
  the 
  four 
  posterior 
  thoracic 
  ganglia. 
  

  

  Fig. 
  10. 
  Central 
  nervous 
  system 
  of 
  Lyreidus 
  tridentatus. 
  Lettering 
  as 
  in 
  fig. 
  8. 
  

  

  Fio-. 
  11. 
  A 
  drawing 
  from 
  the 
  left 
  side 
  of 
  the 
  eleventh 
  and 
  twelfth 
  segments 
  of 
  the 
  common 
  

   lobster 
  to 
  show 
  the 
  relations 
  of 
  the 
  endophragmal 
  to 
  the 
  exoskeleton. 
  xi 
  and 
  

   xii. 
  sterna 
  of 
  the 
  eleventh 
  and 
  twelfth 
  segments. 
  The 
  preparation 
  has 
  been 
  

   slightly 
  tilted 
  to 
  the 
  right 
  to 
  show 
  the 
  endopleurites 
  edpl, 
  consequently 
  the 
  

   epimera 
  Ep. 
  xi 
  and 
  Ep. 
  xii 
  are 
  foreshortened. 
  

  

  Fio-. 
  12. 
  A 
  left 
  side 
  view 
  of 
  the 
  thoracic 
  skeleton 
  of 
  Dromia 
  vulgaris. 
  The 
  ventro-lateral 
  

   projections 
  of 
  the 
  sterna 
  have 
  been 
  omitted, 
  and 
  the 
  preparation 
  is 
  slightly 
  tilted 
  

   over 
  to 
  the 
  right, 
  xi-xiv. 
  the 
  four 
  posterior 
  thoracic 
  sterna. 
  

  

  Plate 
  5. 
  

  

  Fig. 
  13. 
  A 
  posterior 
  view 
  of 
  the 
  thoracic 
  skeleton 
  of 
  the 
  common 
  lobster, 
  showing 
  the 
  large 
  

   size 
  of 
  the 
  penultimate 
  and 
  the 
  structure 
  of 
  the 
  last 
  thoracic 
  sternum. 
  

  

  Fig. 
  14. 
  A 
  posterior 
  view 
  of 
  the 
  thoracic 
  skeleton 
  of 
  Ranina 
  dentata, 
  illustrating 
  the 
  shape 
  

   of 
  the 
  last 
  three 
  thoracic 
  sterna 
  and 
  the 
  formation 
  of 
  the 
  sella 
  turcica 
  posterior. 
  

   sg.a. 
  sagittal 
  apodemes. 
  

  

  Fig. 
  15. 
  A 
  similar 
  view 
  of 
  the 
  thoracic 
  skeleton 
  of 
  Dromia 
  vidgaris. 
  In 
  the 
  absence 
  of 
  

   sagittal 
  apodemes 
  in 
  the 
  posterior 
  thoracic 
  sterna 
  the 
  arthrophragms 
  xiv/xv 
  

   do 
  not 
  meet 
  in 
  the 
  middle 
  line, 
  and 
  there 
  is 
  no 
  sella 
  turcica. 
  

  

  Fio-. 
  16. 
  The 
  endophragmal 
  skeleton 
  of 
  Notopus 
  dorsipes 
  as 
  seen 
  from 
  above 
  after 
  removal 
  

   of 
  the 
  upper 
  parts 
  of 
  the 
  epimera. 
  6, 
  7, 
  S, 
  the 
  articular 
  cavities 
  of 
  the 
  

   second 
  maxilla 
  and 
  first 
  and 
  second 
  maxillipeds. 
  The 
  endosternites 
  edst. 
  and 
  

   endopleurites 
  edpl. 
  are 
  clearly 
  shown. 
  

  

  