﻿266 
  Transactions. 
  — 
  Zoolofjy. 
  

  

  situated 
  on 
  a 
  very 
  slight 
  eminence 
  common 
  to 
  them 
  with 
  the 
  posterior 
  

   laterals, 
  they 
  look 
  forward 
  and 
  slightly 
  outwards. 
  Posterior 
  middles 
  look 
  

   upwards, 
  posterior 
  laterals 
  upwards 
  and 
  outwards. 
  

  

  Sternum 
  a 
  long 
  heart-shape, 
  flat, 
  with 
  concave 
  emarginations 
  opposite 
  

   the 
  cox£e. 
  

  

  Lip 
  twice 
  as 
  long 
  as 
  broad, 
  tongue-shaped, 
  sides 
  nearly 
  parallel, 
  but 
  

   narrowing 
  somewhat 
  anteriorly, 
  towards 
  its 
  origin 
  it 
  is 
  pinched 
  iu 
  and 
  then 
  

   widens 
  to 
  its 
  insertion. 
  Its 
  anterior 
  border 
  is 
  notched. 
  

  

  Maxillse 
  cut 
  obliquely 
  away 
  from 
  the 
  lip 
  and 
  running 
  to 
  a 
  sharp 
  point 
  

   anteriorly, 
  outer 
  border 
  rounded, 
  pinched 
  in 
  anteriorly 
  to 
  the 
  insertion 
  of 
  

   the 
  palpi, 
  flattish, 
  but 
  becoming 
  more 
  convex 
  towards 
  their 
  insertion. 
  

   Abdomen 
  ovoid. 
  Spinnerets 
  short, 
  diverging, 
  the 
  upper 
  and 
  lower 
  pair 
  

   rather 
  longer 
  than 
  the 
  middle 
  pair. 
  Legs 
  long, 
  slender, 
  clothed 
  with 
  

   yellowish 
  white 
  hairs 
  intermingled 
  with 
  bristles 
  at 
  distal 
  end 
  of 
  third 
  and 
  

   fourth 
  tibial 
  joints. 
  

  

  Tarsi 
  have 
  three 
  claws, 
  the 
  two 
  principal 
  claws 
  deeply 
  combed, 
  the 
  

   posterior 
  claw 
  small, 
  inconspicuous, 
  not 
  combed, 
  and 
  abruptly 
  bent 
  just 
  

   beyond 
  its 
  origin. 
  

  

  Male 
  palpi 
  long, 
  slender. 
  The 
  radial 
  joint 
  has 
  on 
  its 
  outer 
  side 
  a 
  

   bifurcate 
  process, 
  the 
  lower 
  segment 
  thin, 
  broad, 
  and 
  flattened, 
  yellowish, 
  

   with 
  the 
  upper 
  border 
  thickened, 
  and 
  dark 
  brown, 
  the 
  upper 
  segment 
  thick, 
  

   very 
  much 
  narrower 
  than 
  the 
  lower 
  segment, 
  from 
  which 
  it 
  is 
  slightly 
  

   turned 
  away, 
  blunt 
  at 
  its 
  point, 
  dark 
  brown. 
  The 
  digital 
  joint 
  ovoid, 
  ^ro- 
  

   longed, 
  and 
  tapering 
  distally, 
  and 
  provided 
  at 
  its 
  extremity 
  with 
  short, 
  stout 
  

   spines 
  ; 
  the 
  palpal 
  organ 
  has 
  a 
  coiled 
  cirrhus 
  about 
  three-fourths 
  the 
  cir- 
  

   cumference 
  of 
  the 
  organ 
  in 
  length. 
  The 
  palpi 
  are 
  clothed 
  with 
  abundant 
  

  

  long 
  hairs. 
  

  

  Meastjeements. 
  

  

  M. 
  

  

  Total 
  length 
  .. 
  .. 
  ., 
  0-015 
  

  

  Cephalothorax 
  0-0042 
  

  

  Falces 
  0-0042 
  

  

  Abdomen 
  . 
  . 
  . 
  . 
  . 
  . 
  O'OOo 
  

  

  Leg 
  of 
  1st 
  pair 
  .. 
  .. 
  0-0145 
  \ 
  

  

  -verified 
  exact 
  in 
  a 
  second 
  specimen^ 
  

  

  2nd 
  „ 
  .. 
  .. 
  0-01 
  I 
  

  

  „ 
  3rd 
  „ 
  .. 
  .. 
  0-009 
  

  

  M 
  4th 
  „ 
  .. 
  .. 
  O-OlOsi 
  

  

  Male 
  palpus 
  . 
  . 
  . 
  . 
  . 
  . 
  0-0075 
  

  

  Female. 
  — 
  Colouring 
  as 
  male. 
  Cephalothorax 
  more 
  convex 
  above, 
  

   falces 
  slightly 
  shorter 
  but 
  more 
  massive. 
  Fang 
  thicker 
  and 
  stronger* 
  

   Epigyne 
  pale-yellowish. 
  A 
  small 
  concavity 
  with 
  a 
  denticle 
  on 
  either 
  side 
  

   pointing 
  inwards, 
  posteriorly 
  a 
  short 
  blunt 
  process 
  directed 
  backwards. 
  

  

  Desis 
  rohsoni 
  is 
  excedingly 
  like 
  Desis 
  martensii 
  (Koch, 
  Arachn. 
  Austral.), 
  

   which 
  it 
  also 
  resembles 
  in 
  its 
  marine 
  habits. 
  This 
  is 
  so 
  interesting 
  that 
  I 
  

   jnake 
  no 
  apology 
  for 
  quoting 
  Dr. 
  Koch's 
  remarks 
  in 
  full 
  ;~ 
  

  

  