﻿ACADEMY 
  OF 
  SCIENCES. 
  255 
  

  

  In 
  the 
  female 
  they 
  seem 
  to 
  be 
  changed 
  into 
  pouches 
  for 
  the 
  development 
  of 
  the 
  

   ova. 
  Posterior 
  part 
  of 
  the 
  body 
  as 
  in 
  C. 
  Scammoni, 
  but 
  there 
  are 
  no 
  serra- 
  

   tions 
  on 
  the 
  anterior 
  edge 
  of 
  the 
  seventh 
  segment. 
  Length 
  of 
  largest 
  specimen, 
  

   0.8 
  inches. 
  Domicile 
  on 
  Balana 
  Siebodii, 
  Gray 
  ; 
  North 
  Pacific 
  Ocean. 
  

  

  This 
  is 
  readily 
  distinguished 
  from 
  C. 
  mijsticeti 
  Dall, 
  by 
  its 
  spiked 
  " 
  hands 
  " 
  

   and 
  knobby 
  branchial 
  segments 
  ; 
  and 
  from 
  C. 
  Scammoni 
  by 
  its 
  straight 
  un- 
  

   equal 
  branchire, 
  long 
  antennae, 
  knobs, 
  and 
  the 
  shape 
  of 
  the 
  head. 
  

  

  Cijamus 
  gracilis, 
  n. 
  s. 
  

  

  This 
  species 
  is 
  of 
  a 
  pale, 
  v?axen 
  yellow, 
  of 
  elongated 
  and 
  slender 
  form, 
  and 
  small 
  

   and 
  slender 
  limbs. 
  It 
  more 
  nearly 
  resembles 
  C. 
  suffusus 
  Dall, 
  (Scammon 
  loc. 
  

   cit. 
  pi. 
  X, 
  figure 
  3) 
  than 
  any 
  of 
  the 
  other 
  described 
  species. 
  It 
  differs 
  from 
  

   that 
  species 
  in 
  the 
  following 
  particulars 
  : 
  It 
  is 
  smaller, 
  the 
  largest 
  specimen 
  

   measuring 
  only 
  0.5 
  of 
  an 
  inch 
  in 
  length. 
  It 
  wants 
  the 
  purple 
  color, 
  and 
  is 
  more 
  

   compact 
  and 
  solid. 
  The 
  second 
  pair 
  of 
  antennas 
  are 
  much 
  shorter, 
  being 
  only 
  

   equal 
  to 
  the 
  first 
  segment 
  and 
  half 
  of 
  the 
  next 
  segment 
  of 
  the 
  corresponding 
  

   members 
  in 
  C. 
  suffusus. 
  The 
  branchiae, 
  though 
  similar, 
  are 
  proportionally 
  one- 
  

   third 
  shorter. 
  The 
  posterior 
  limbs 
  are 
  shorter 
  and 
  much 
  more 
  weak 
  and 
  slender 
  

   than 
  in 
  C. 
  suffusus. 
  The 
  first 
  pair 
  of 
  " 
  hands 
  " 
  are 
  slenderly 
  pyriform, 
  instead 
  

   of 
  quadrate. 
  The 
  second 
  pair 
  are 
  simple, 
  without 
  the 
  tubercles 
  between 
  the 
  

   articulation 
  of 
  the 
  limb 
  and 
  the 
  " 
  finger 
  ; 
  " 
  or, 
  at 
  most, 
  in 
  the 
  largest 
  specimens, 
  

   the 
  termination 
  of 
  the 
  hand 
  under 
  the 
  articulation 
  of 
  the 
  hook, 
  or 
  finger, 
  is 
  

   slightly 
  produced 
  into 
  a 
  point. 
  The 
  head 
  is 
  shorter, 
  sub-triangular 
  instead 
  of 
  

   elongated. 
  Lastly, 
  the 
  segments 
  of 
  the 
  body 
  are 
  more 
  or 
  less 
  closely 
  appressed 
  

   against 
  each 
  other 
  before 
  and 
  behind, 
  instead 
  of 
  being 
  laterally 
  attenuated, 
  and 
  

   separated 
  as 
  in 
  suffusus. 
  They 
  are 
  also 
  proportionately 
  less 
  wide 
  from 
  side 
  to 
  

   side 
  than 
  in 
  suffusus. 
  Habitat, 
  with 
  the 
  last. 
  

  

  The 
  prominent 
  features 
  of 
  this 
  species 
  are 
  its 
  slender 
  and 
  compact 
  form, 
  short 
  

   antennae, 
  and 
  weak 
  and 
  inconspicuous 
  posterior 
  limbs. 
  

  

  Captain 
  T. 
  W. 
  Williams 
  brought 
  down 
  from 
  the 
  Arctic 
  Ocean, 
  in 
  1873, 
  

   some 
  parasites 
  from 
  the 
  walrus, 
  which 
  he 
  presented 
  to 
  the 
  Academy. 
  These 
  

   parasi^tes 
  are 
  of 
  a 
  very 
  dark 
  brown 
  color, 
  almost 
  perfectly 
  round 
  in 
  shape, 
  

   with 
  an 
  indistinctly 
  segmented 
  abdomen, 
  somewhat 
  roughened 
  with 
  short 
  hairs 
  ; 
  

   three 
  pairs 
  of 
  short, 
  bristly 
  legs, 
  a 
  distinct 
  but 
  small 
  throat, 
  and 
  very 
  small 
  

   and 
  short 
  head. 
  There 
  is 
  one 
  pair 
  of 
  short, 
  stout 
  antenna;, 
  with 
  four 
  joints 
  ; 
  

   the 
  mouth 
  is 
  suctorial. 
  There 
  are 
  no 
  other 
  appendages 
  to 
  the 
  abdomen 
  or 
  

   head. 
  The 
  want 
  of 
  books 
  of 
  reference 
  prevents 
  my 
  being 
  able 
  to 
  refer 
  these 
  

   creatures 
  to 
  their 
  proper 
  generic 
  position 
  ; 
  and 
  it 
  would 
  be, 
  in 
  any 
  case, 
  inad- 
  

   visable 
  to 
  describe 
  them 
  as 
  new, 
  as 
  parasites 
  from 
  the 
  walrus 
  of 
  the 
  North 
  

   Sea 
  have 
  been 
  recently 
  described 
  by 
  a 
  Swedish 
  naturalist, 
  and 
  they 
  may 
  be 
  

   identical 
  with 
  the 
  present 
  form. 
  

  

  Mr. 
  Stearns, 
  reporting 
  for 
  the 
  Publication 
  Committee, 
  spoke 
  of 
  

   the 
  large 
  amount 
  of 
  work 
  accomplished 
  by 
  the 
  Committee 
  during 
  

   the 
  past 
  year, 
  and 
  stated 
  that 
  the 
  Proceedings 
  of 
  the 
  Academy, 
  

   for 
  1873, 
  would 
  be 
  ready 
  for 
  distribution 
  at 
  the 
  next 
  meeting. 
  

  

  