﻿[9] 
  ANNELIDA 
  CIIiETOPODA. 
  715 
  

  

  the 
  anal 
  plate 
  is 
  a 
  thin 
  membrane,, 
  with 
  simple 
  margin, 
  projecting 
  only 
  

   a 
  short 
  distance 
  beyond 
  the 
  anal 
  segment, 
  and 
  not 
  wider 
  than 
  that 
  

   segment, 
  and 
  the 
  posterior 
  segments 
  are 
  much 
  longer 
  than 
  in 
  the 
  ma- 
  

   ture 
  form. 
  

  

  Length, 
  3-6""\ 
  

  

  Width, 
  0.2" 
  1 
  "', 
  0.6 
  mm 
  . 
  

  

  Coarse 
  sand 
  and 
  gravel 
  and 
  muddy 
  sand; 
  not 
  uncommon. 
  

  

  Gyptis 
  Marion 
  and 
  Bobretzky, 
  

   Gyptis 
  vittata, 
  n. 
  sp. 
  

  

  (Pl. 
  I, 
  Figs. 
  21, 
  22; 
  Pl. 
  II, 
  Fig. 
  23.) 
  

  

  The 
  head 
  is 
  somewhat 
  quadrangular 
  (fig. 
  21), 
  the 
  lateral 
  and 
  ante 
  

   rior 
  margins 
  being 
  slightly 
  convex, 
  the 
  posterior 
  margin 
  concave, 
  all 
  the 
  

   angles 
  widely 
  rounded. 
  

  

  ►Superior 
  paired 
  antennae 
  cylindrical 
  to 
  near 
  the 
  end, 
  then 
  suddenly 
  

   conical 
  ; 
  median 
  antenna*, 
  short, 
  fusiform 
  ; 
  iuferior 
  antennae 
  (palpi) 
  com- 
  

   posed 
  of 
  two 
  articles, 
  about 
  equal 
  in 
  length 
  ; 
  they 
  arise 
  well 
  bach 
  on 
  

   the 
  inferior 
  surface 
  of 
  the 
  head, 
  and 
  are 
  nearly 
  as 
  long 
  as 
  the 
  superior 
  

   antenna 
  1 
  , 
  but 
  the 
  part 
  visible 
  in 
  a 
  dorsal 
  view 
  is 
  only 
  about 
  one-hall' 
  as 
  

   long; 
  both 
  articles 
  are 
  cylindrical, 
  the 
  inner 
  larger 
  than 
  the 
  outer. 
  

  

  There 
  are 
  two 
  pairs 
  of 
  eyes 
  situated 
  on 
  the 
  middle 
  line; 
  the 
  outer 
  

   pair 
  crescentic, 
  large, 
  lateral 
  ; 
  the 
  inner 
  pair 
  almost 
  in 
  contact 
  with 
  the 
  

   •outer, 
  oval, 
  small. 
  

  

  The 
  first 
  segment 
  seen 
  dorsally 
  is 
  very 
  short; 
  it 
  bears 
  two 
  pairs 
  of 
  

   tentacular 
  cirri 
  ; 
  the 
  second 
  segment 
  a 
  little 
  longer 
  than 
  the 
  first, 
  

   shorter 
  than 
  the 
  second. 
  The 
  tentacular 
  cirri 
  taper 
  slightly 
  from 
  their 
  

   origin 
  ; 
  they 
  are 
  composed 
  of 
  numerous 
  articles, 
  of 
  which 
  those 
  along 
  

   the 
  inner 
  third 
  are 
  shorter 
  and 
  less 
  distinctly 
  separated 
  from 
  each 
  other 
  

   than 
  the 
  others. 
  The 
  upper 
  cirri 
  are 
  from 
  two 
  to 
  three 
  times 
  the 
  width 
  

   of 
  the 
  body 
  in 
  length 
  ; 
  the 
  lower 
  from 
  one-half 
  to 
  two-thirds 
  as 
  long 
  as 
  

   the 
  upper. 
  

  

  The 
  dorsal 
  cirri 
  are 
  similar 
  to 
  the 
  tentacular 
  cirri, 
  but 
  a 
  little 
  shorter 
  

   and 
  not 
  so 
  stout. 
  The 
  feet 
  begin 
  on 
  the 
  fifth 
  segment; 
  they 
  are 
  com- 
  

   posed 
  of 
  two 
  distinct 
  rami 
  (fig. 
  22). 
  The 
  dorsal 
  ramus 
  arises 
  from 
  the 
  

   inner 
  part 
  of 
  the 
  foot, 
  just 
  below 
  (outside) 
  the 
  origin 
  of 
  the 
  dorsal 
  cir- 
  

   rus; 
  it 
  is 
  small 
  but 
  well 
  defined, 
  somewhat 
  compressed, 
  more 
  convex 
  

   above 
  than 
  below, 
  pointed 
  ; 
  the 
  lower 
  ramus 
  (fig. 
  22) 
  is 
  stout, 
  elon- 
  

   gated, 
  inner 
  three-fourths 
  irregularly 
  convex, 
  outer 
  fourth 
  conical 
  ; 
  the 
  

   ventral 
  cirrus 
  arises 
  from 
  the 
  under 
  surface 
  of 
  the 
  foot, 
  near 
  its 
  base, 
  

   is 
  stout, 
  conical, 
  apex 
  bluntly 
  rounded, 
  from 
  one-half 
  to 
  two-thirds 
  the 
  

   length 
  of 
  the 
  foot. 
  

  

  There 
  are 
  three 
  anal 
  cirri, 
  two 
  long, 
  lateral 
  similar 
  in 
  all 
  respects 
  

   to 
  the 
  dorsal 
  cirri, 
  and 
  one 
  short 
  median 
  style. 
  

  

  The 
  body 
  is 
  convex 
  above, 
  nearly 
  flat 
  below, 
  widest 
  in 
  the 
  middle. 
  

  

  