﻿164 
  H. 
  M. 
  WOODCOCK. 
  

  

  clear 
  and 
  careful 
  drawings, 
  the 
  real 
  siguificauce 
  of 
  whicli 
  

   will 
  be 
  readily 
  manifest 
  on 
  comparing 
  them 
  with 
  the 
  figures 
  

   of 
  another 
  Coccidian, 
  Caryotropha 
  mesnilii, 
  lately 
  des- 
  

   cribed 
  by 
  Siedlecki 
  (2) 
  from 
  a 
  Poly 
  chaste, 
  Polymnia 
  

   nebulosa, 
  where 
  it 
  inhabits 
  the 
  testis. 
  The 
  name 
  Klos- 
  

   siella 
  muris 
  may 
  quite 
  well 
  be 
  retained, 
  at 
  any 
  rate 
  until 
  

   the 
  parasite 
  is 
  re-discovered 
  and 
  the 
  number 
  of 
  its 
  genuine 
  

   spores 
  and 
  sporozoites 
  determined, 
  since, 
  notwithstanding 
  

   the 
  resemblance 
  between 
  the 
  schizogonic 
  phase 
  in 
  the 
  two 
  

   forms, 
  the 
  very 
  different 
  habitat, 
  and 
  important 
  distinctions 
  

   in 
  the 
  manner 
  of 
  formation 
  of 
  the 
  microgametocytes 
  already 
  

   preclude 
  us 
  from 
  uniting 
  the 
  two 
  genera 
  together. 
  

  

  The 
  drawings 
  in 
  Fig. 
  A 
  are 
  reproduced 
  from 
  Smith 
  and 
  

   Johnson's 
  figures, 
  and 
  those 
  in 
  Fig. 
  B 
  are 
  copied 
  from 
  

   Siedlecki's 
  paper. 
  All 
  are 
  drawn 
  the 
  same 
  size 
  as 
  the 
  

   originals.^ 
  I 
  will 
  first 
  give, 
  as 
  it 
  were, 
  a 
  revised 
  account 
  of 
  

   Avhat 
  is 
  known 
  of 
  the 
  life-history 
  of 
  Klossiella 
  muris, 
  and 
  

   then 
  proceed 
  to 
  justify 
  my 
  interpretation 
  of 
  the 
  same, 
  finally 
  

   contrasting 
  the 
  genus 
  with 
  one 
  or 
  two 
  other 
  Coccidia. 
  The 
  

   authors' 
  designations 
  of 
  the 
  various 
  stages 
  are 
  enclosed 
  in 
  

   square 
  brackets. 
  

  

  In 
  Fig. 
  A 
  (1) 
  we 
  have 
  one 
  of 
  the 
  smallest 
  trophozoites 
  

   [sporonts] 
  seen. 
  Such 
  a 
  young 
  form, 
  commencing 
  to 
  

   grow, 
  is 
  from 
  8 
  ju 
  to 
  11 
  /t 
  in 
  diameter, 
  and 
  lies 
  in 
  a 
  

   vacuole 
  (v.) 
  in 
  the 
  host-cell. 
  Its 
  membrane, 
  so 
  far 
  as 
  it 
  

   has 
  one, 
  is 
  very 
  delicate, 
  and 
  practically 
  only 
  a 
  limit 
  

   to 
  the 
  cell. 
  Each 
  individual 
  contains 
  from 
  ten 
  to 
  twenty 
  

   plastin 
  granules 
  {pi. 
  g.). 
  " 
  N." 
  is 
  the 
  nucleus 
  of 
  the 
  host- 
  

   cell, 
  and 
  " 
  n" 
  that 
  of 
  the 
  parasite. 
  In 
  the 
  next 
  figure, 
  A 
  (2), 
  

   the 
  trophozoite 
  has 
  become 
  considerably 
  larger 
  (even 
  allow- 
  

   ing 
  for 
  the 
  difference 
  in 
  magnification), 
  and 
  is 
  now 
  almost 
  

   full-grown; 
  it 
  is, 
  in 
  fact, 
  a 
  schizont 
  beginning 
  merogony 
  

   [mother-sporoblast] 
  . 
  Such 
  an 
  adult 
  trophozoite 
  or 
  schizont 
  

  

  1 
  A 
  comparison 
  of 
  Smith 
  and 
  Johnson's 
  different 
  figures 
  would 
  have 
  been 
  

   greatly 
  facilitated 
  if 
  they 
  had 
  been 
  drawn 
  to 
  the 
  same, 
  or 
  multiples 
  of 
  the 
  

   same, 
  magnification; 
  while 
  Siedlecki 
  does 
  not 
  give 
  the 
  magnification 
  of 
  his 
  at 
  

   all. 
  

  

  