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  PROFESSORS 
  EDWARD 
  FORBES 
  AND 
  J. 
  GOODSIR 
  ON 
  SOME 
  

  

  namely, 
  the 
  S. 
  halterata, 
  a 
  native 
  of 
  the 
  coasts 
  of 
  Cornwall. 
  We 
  have 
  the 
  

   pleasure 
  of 
  adding 
  a 
  second 
  and 
  very 
  distinct 
  species, 
  to 
  which 
  the 
  name 
  of 
  

   Slabberia 
  catenata 
  may 
  be 
  applied. 
  

  

  It 
  differs 
  from 
  the 
  former, 
  among 
  other 
  characters, 
  most 
  conspicuously 
  in 
  

   having 
  its 
  poiser-like 
  marginal 
  tentacula 
  thickened 
  for 
  half 
  their 
  length 
  by 
  a 
  

   series 
  of 
  rings 
  or 
  bulbs, 
  charged 
  with 
  pigment 
  cells, 
  and 
  ranged 
  in 
  succession 
  

   above 
  the 
  terminal 
  bulb 
  with 
  a 
  dark 
  nucleus, 
  so 
  characteristic 
  of 
  the 
  genus. 
  

  

  The 
  umbrella 
  is 
  deeply 
  campanulate 
  or 
  subglobular, 
  smooth 
  and 
  colourless. 
  

   The 
  subumbrella 
  is 
  much 
  less 
  in 
  proportion 
  than 
  in 
  its 
  described 
  ally 
  ; 
  it 
  is 
  

   divided 
  into 
  equal 
  portions 
  by 
  four 
  canals, 
  which 
  open 
  into 
  a 
  central 
  marginal 
  

   vessel. 
  The 
  very 
  minute 
  linear 
  genital 
  glands 
  can 
  scarcely 
  be 
  traced 
  on 
  the 
  

   upper 
  part 
  of 
  these 
  vessels. 
  The 
  border 
  of 
  the 
  general 
  cavity 
  is 
  provided 
  with 
  a 
  

   shelf-like 
  veil. 
  The 
  tentacula 
  are 
  stout, 
  four 
  in 
  number, 
  colourless, 
  and 
  cylindrical 
  

   in 
  their 
  upper, 
  nodulose 
  and 
  annulated 
  in 
  their 
  lower 
  half. 
  There 
  are 
  five 
  or 
  

   six 
  ring-like 
  or 
  bulbous 
  thickenings, 
  besides 
  the 
  terminal 
  bulb. 
  Each 
  is 
  of 
  an 
  

   orange 
  hue, 
  and 
  the 
  lower 
  ones 
  are 
  larger 
  than 
  the 
  upper. 
  The 
  next 
  above 
  the 
  

   terminal 
  bulb 
  is 
  largest. 
  The 
  terminal 
  bulb 
  is 
  also 
  orange, 
  but 
  has 
  a 
  dark 
  

   nucleus. 
  The 
  tentacula 
  spring 
  from 
  ocellated 
  bulbs. 
  These 
  are 
  somewhat 
  trian- 
  

   gular 
  in 
  shape, 
  pale 
  yellow 
  above, 
  marked 
  across 
  the 
  centre 
  by 
  a 
  band 
  of 
  dark 
  

   orange, 
  below 
  which, 
  on 
  a 
  pale 
  yellow 
  ground, 
  is 
  the 
  small 
  black 
  ocellus. 
  The 
  

   peduncle, 
  or 
  stomach, 
  is 
  longer 
  than 
  the 
  tentacula 
  when 
  expanded 
  to 
  its 
  full 
  

   dimensions. 
  It 
  is 
  highly 
  contractile, 
  and 
  is 
  of 
  a 
  dull 
  olive 
  hue, 
  with 
  indications 
  

   of 
  darker 
  cylindrical 
  bands. 
  The 
  height 
  of 
  the 
  umbrella 
  was 
  about 
  two-tenths 
  of 
  

   an 
  inch. 
  This 
  curious 
  medusa 
  was 
  taken 
  off 
  Tobermory, 
  and 
  afterwards 
  near 
  

   Loch 
  Laigh 
  in 
  Mull. 
  

  

  Hippocrene 
  pyramidaia. 
  Sp. 
  Nov. 
  — 
  During 
  our 
  cruise, 
  we 
  had 
  the 
  good 
  

   fortune 
  to 
  add 
  no 
  fewer 
  than 
  three 
  new 
  and 
  very 
  distinct 
  species 
  to 
  the 
  beautiful 
  

   and 
  singular 
  genus 
  Hippocrene 
  or 
  Bougainrillia. 
  They, 
  like 
  their 
  congeners, 
  were 
  

   all 
  exceedingly 
  minute. 
  

  

  The 
  first 
  of 
  which 
  we 
  name 
  H. 
  pyramidata, 
  is 
  distinguished 
  conspicuously 
  by 
  

   the 
  form 
  of 
  the 
  ovarian 
  lobes 
  of 
  the 
  peduncle 
  ; 
  instead 
  of 
  being 
  quadrate, 
  as 
  in 
  all 
  

   known 
  species, 
  they 
  are 
  triangular, 
  so 
  that 
  the 
  entire 
  peduncle 
  assumes 
  the 
  

   shape 
  of 
  an 
  inverted 
  pyramid. 
  

  

  The 
  umbrella 
  is 
  transparent, 
  smooth, 
  colourless, 
  and 
  subglobular. 
  The 
  sub- 
  

   umbrella 
  is 
  comparatively 
  small 
  and 
  quadrately 
  campanulate; 
  its 
  opening 
  is 
  

   protected 
  by 
  a 
  four-lobed 
  veil. 
  At 
  the 
  four 
  angles 
  are 
  the 
  groups 
  of 
  connate 
  eye- 
  

   tubercles. 
  Each 
  group 
  forms 
  an 
  oblong 
  mass, 
  the 
  general 
  colour 
  of 
  which 
  is 
  

   yellowish 
  below 
  and 
  orange 
  above. 
  From 
  four 
  to 
  six 
  tubercles 
  go 
  to 
  a 
  mass, 
  and 
  

   the 
  orange-coloured 
  portion 
  is 
  lobed 
  according 
  to 
  their 
  number. 
  On 
  the 
  lobed 
  

   yellowish 
  part 
  below 
  is 
  a 
  black 
  eye-speck, 
  one 
  to 
  each 
  tubercle. 
  One, 
  or 
  at 
  most 
  

   two 
  transparent 
  tentacula, 
  were 
  seen 
  to 
  protrude 
  from 
  each 
  of 
  the 
  masses. 
  The 
  

  

  