﻿[89] 
  DECAPODA 
  FROM 
  ALBATROSS 
  DREDGINGS. 
  693 
  

  

  show 
  some 
  important 
  differences. 
  The 
  ventral 
  process 
  of 
  the 
  crowo 
  

   of 
  the 
  mandible, 
  instead 
  of 
  being 
  truncated 
  at 
  the 
  anterior 
  angle, 
  is 
  

   prolonged 
  into 
  an 
  acute 
  angular 
  process 
  which 
  closes 
  by 
  a 
  similar 
  proc- 
  

   ess 
  of 
  the 
  opposite 
  side. 
  The 
  palpus 
  is 
  very 
  different 
  in 
  form; 
  the 
  

   proximal 
  segment 
  is 
  narrow, 
  about 
  three 
  times 
  as 
  long 
  as 
  broad, 
  reaches 
  

   to 
  about 
  the 
  tip 
  of 
  the 
  crown, 
  and 
  expands 
  very 
  slightly 
  distally; 
  the 
  

   distal 
  segment 
  is 
  only 
  about 
  half 
  as 
  long 
  as 
  the 
  proximal 
  and 
  about 
  as 
  

   wide 
  at 
  the 
  base, 
  but 
  the 
  iuner 
  edge 
  is 
  obliquely 
  truncated 
  from 
  just 
  below 
  

   the 
  middle 
  so 
  that 
  the 
  obtuse 
  tip 
  is 
  narrow. 
  The 
  first 
  maxillae 
  differ 
  ouly 
  

   very 
  slightly 
  and 
  unessentially. 
  The 
  endognath 
  andepignath 
  of 
  the 
  sec- 
  

   ond 
  inaxillae 
  differ 
  very 
  little, 
  but 
  the 
  four 
  lobes 
  of 
  the 
  protognath 
  are 
  

   very 
  much 
  more 
  nearly 
  alike, 
  the 
  distal 
  lobe 
  being 
  only 
  a 
  very 
  little 
  broader 
  

   than 
  the 
  others, 
  while 
  the 
  proximal 
  is 
  very 
  much 
  like 
  the 
  others, 
  being 
  

   as 
  long 
  as 
  the 
  one 
  next 
  it 
  and 
  not 
  narrowed 
  toward 
  the 
  rounded 
  tip. 
  

   The 
  endognath 
  of 
  the 
  maxilliped 
  is 
  a 
  little 
  shorter 
  and 
  the 
  small 
  ter- 
  

   minal 
  segment 
  either 
  wanting 
  or 
  very 
  obscure; 
  the 
  exopod 
  is 
  shorter 
  

   and 
  suddenly 
  narrowed 
  into 
  a 
  short 
  and 
  slender 
  flagelliform 
  tip. 
  The 
  

   exopod 
  of 
  the 
  first 
  gnathopod 
  is 
  very 
  much 
  smaller, 
  being 
  very 
  slender 
  

   and 
  considerably 
  shorter 
  than 
  the 
  endopod. 
  The 
  endopod 
  of 
  the 
  second 
  

   gnathopod 
  is 
  more 
  slender 
  and 
  armed 
  with 
  longer 
  and 
  stronger 
  spines, 
  

   and 
  the 
  dactylus 
  is 
  very 
  different, 
  being 
  nearly 
  two- 
  thirds 
  as 
  long 
  as 
  the 
  

   propodus, 
  slender, 
  subcylindrical, 
  and 
  strongly 
  tapered 
  distally, 
  where 
  

   it 
  is 
  armed 
  with 
  several 
  slender 
  spines 
  nearly 
  as 
  long 
  as 
  itself. 
  

  

  The 
  chelate 
  peraeopods 
  are 
  similar 
  to 
  those 
  of 
  Benthcecetes 
  Bartletti, 
  

   but 
  considerably 
  longer 
  and 
  more 
  slender, 
  the 
  first 
  pair 
  reaching 
  con- 
  

   siderably 
  by 
  the 
  tips 
  of 
  the 
  second 
  gnathopods. 
  The 
  fourth 
  and 
  fifth 
  

   peraeopods 
  are 
  very 
  long, 
  exceedingly 
  slender, 
  and 
  the 
  proximal 
  por- 
  

   tions 
  nearly 
  as 
  in 
  Benthcecetes 
  Bartletti. 
  The 
  carpi 
  in 
  the 
  fifth 
  pair 
  are 
  

   considerably 
  longer 
  than 
  the 
  ineri 
  ; 
  the 
  propodi 
  in 
  the 
  fourth 
  are 
  much 
  

   shorter 
  than 
  the 
  carpi, 
  and 
  in 
  the 
  fifth 
  not 
  half 
  as 
  long 
  as 
  the 
  carpi 
  ; 
  

   the 
  dactyli 
  are 
  slender, 
  multiarticulate, 
  flagelliform, 
  and 
  very 
  long, 
  be- 
  

   ing 
  in 
  the 
  fourth 
  pair 
  fully 
  three 
  times 
  as 
  long 
  as 
  the 
  propodi. 
  The 
  

   number 
  and 
  arrangement 
  of 
  the 
  branchiae 
  and 
  epipods 
  are 
  the 
  same 
  as 
  

   in 
  Benthcecetes 
  Bartletti, 
  but 
  there 
  are 
  small 
  rudimentary 
  exopods 
  at 
  the 
  

   bases 
  of 
  all 
  the 
  peraeopods, 
  as 
  in 
  Benthesicymus 
  f 
  carinatus. 
  

  

  The 
  pleon 
  is 
  similar 
  to 
  that 
  of 
  Benthcecetes 
  Bartletti 
  except 
  that 
  there 
  

   is 
  no 
  spine 
  on 
  the 
  fifth 
  somite. 
  The 
  dorsum 
  is 
  evenly 
  rounded 
  on 
  the 
  

   first 
  four 
  somites, 
  but 
  on 
  the 
  fifth 
  and 
  sixth 
  there 
  is 
  a 
  sharp 
  median 
  

   carina 
  which 
  projects 
  posteriorly 
  in 
  a 
  very 
  slight 
  angle 
  on 
  each 
  of 
  these 
  

   somites. 
  The 
  epimera 
  are 
  all 
  somewhat 
  smaller 
  than 
  in 
  Benthcecetes 
  

   Bartletti, 
  and 
  the 
  posterior 
  edges 
  of 
  the 
  fourth 
  and 
  fifth 
  project 
  much 
  

   less 
  and 
  are 
  broadly 
  rounded. 
  The 
  telson 
  is 
  narrowly 
  triangular, 
  trans- 
  

   versely 
  convex 
  above 
  at 
  the 
  base, 
  but 
  with 
  a 
  broad 
  and 
  shallow 
  sulcus 
  two- 
  

   thirds 
  of 
  its 
  length. 
  The 
  extreme 
  tip 
  is 
  spiniform 
  and 
  acute, 
  and 
  just 
  

   in 
  front 
  of 
  it 
  the 
  eage 
  each 
  side 
  is 
  armed 
  with 
  three 
  small 
  spines. 
  The 
  

   sternum 
  of 
  the 
  first 
  somite 
  is 
  armed 
  with 
  a 
  laterally 
  compressed 
  mesial 
  

  

  