﻿TWO 
  NEW 
  FORMS 
  OF 
  CHONIOSTOMATID^. 
  353 
  

  

  the 
  lengtli 
  of 
  the 
  seta 
  on 
  these 
  appendages 
  and 
  on 
  the 
  caudal 
  

   stylets 
  it 
  differs 
  considerably 
  from 
  all 
  other 
  forms 
  hitherto 
  

   known. 
  Furthermore, 
  I 
  have 
  not 
  observed 
  the 
  existence 
  of 
  

   two 
  hairy 
  arete 
  in 
  front 
  and 
  two 
  transverse 
  rows 
  of 
  hairs 
  more 
  

   backwards 
  on 
  the 
  upper 
  surface 
  of 
  the 
  head 
  in 
  the 
  male 
  of 
  

   any 
  other 
  species. 
  The 
  structui-e 
  of 
  the 
  hairs 
  on 
  the 
  trunk 
  

   is 
  rather 
  similar 
  to 
  that 
  met 
  with 
  in 
  Sph. 
  Giardii, 
  H. 
  J. 
  H. 
  

   The 
  female 
  is, 
  as 
  usual, 
  less 
  characteristic 
  than 
  the 
  male, 
  but 
  

   presents 
  yet 
  some 
  distinguishing 
  features: 
  in 
  most 
  other 
  

   species 
  the 
  trunk 
  is 
  almost 
  totally 
  naked 
  ; 
  in 
  no 
  other 
  

   female 
  I 
  observed 
  two 
  hairy 
  areas 
  on 
  the 
  upper 
  surface 
  of 
  

   the 
  head 
  behind 
  the 
  frontal 
  margin, 
  and 
  the 
  distribution 
  of 
  

   hairs 
  on 
  the 
  lower 
  surface 
  of 
  the 
  head 
  is 
  rather 
  similar 
  to 
  

   that 
  in 
  Sph. 
  intermedia, 
  H. 
  J. 
  H., 
  but 
  differing 
  from 
  most 
  

   other 
  species; 
  the 
  shape 
  of 
  the 
  submedian 
  skeleton 
  and 
  of 
  

   the 
  transverse 
  strips 
  just 
  in 
  front 
  of 
  the 
  trunk 
  was 
  not 
  ob- 
  

   served 
  in 
  any 
  other 
  form. 
  

  

  Sphgeronellopsis, 
  n. 
  gen. 
  

  

  Female. 
  — 
  The 
  body 
  is 
  more 
  or 
  less 
  ovate. 
  The 
  head 
  is 
  

   rather 
  large, 
  well 
  defined 
  from 
  the 
  trunk. 
  The 
  frontal 
  

   border 
  is 
  at 
  most 
  feebly 
  developed, 
  while 
  the 
  lateral 
  margins 
  

   are 
  wanting. 
  The 
  antennula3 
  are 
  small, 
  two-jointed; 
  the 
  

   antennae 
  wanting. 
  The 
  mouth 
  of 
  moderate 
  size; 
  its 
  border 
  

   is 
  narrow. 
  The 
  maxillulas 
  are 
  well 
  developed, 
  with 
  a 
  good- 
  

   sized 
  additional 
  branch. 
  The 
  maxillfs 
  are 
  rather 
  small, 
  

   but 
  normally 
  shaped. 
  The 
  maxillipeds 
  consist 
  of 
  only 
  three 
  

   joints 
  : 
  the 
  basal 
  one 
  is 
  short, 
  but 
  very 
  thick, 
  inflated 
  ; 
  the 
  

   second 
  joint, 
  which 
  certainly 
  is 
  formed 
  by 
  the 
  complete 
  

   fusion 
  of 
  two 
  joints, 
  is 
  rather 
  short; 
  the 
  terminal 
  joint 
  is 
  

   nearly 
  rudimentary. 
  The 
  trunk 
  has 
  two 
  quite 
  rudimentary 
  

   pairs 
  of 
  legs, 
  each 
  consisting 
  of 
  a 
  joint 
  with 
  one 
  terminal 
  

   seta. 
  The 
  genital 
  area 
  is 
  well 
  developed, 
  situated 
  on 
  the 
  

   posterior 
  surface 
  of 
  the 
  body, 
  nearly 
  as 
  long 
  as 
  broad 
  ; 
  the 
  

   genital 
  apertures 
  are 
  situated 
  as 
  in 
  Sphaeronella 
  rather 
  

  

  