4 
Anoplophrya  polydorae  FARIA,  CUNHA 
and  FONSECA,  1917. 
This  protozoon  is  a  ciliate  of  the  subor¬ 
der  Astomata  and  belongs  to  the  genus 
Anoplophrya  STEIN. 
Description :  Body  flattened,  the  outline 
oval,  one  side  concave,  the  other  convex,  an¬ 
terior  end  smaller,  posterior  larger.  Cellular 
membrane  showing  longitudinal  striae  star¬ 
ting  from  both  poles  of  the  animal  ;  as  these 
approach  the  miadle  part  of  the  ciliate,  new 
lines  appear  between  them,  filling  up  the  in¬ 
tervals,  so  that  the  distance  between  two 
successive  striae  remains  nearly  equal.  These 
striae  are  occupied  by  several  rows  of  ciliae, 
which  are  fine,  equally  long,  and  arranged 
closely  and  regularly  on  the  entire  surface 
of  the  body.  Ectoplasma  forming  a  narrow 
hyaline  layer,  equally  disposed  beneath  the 
cellular  membrane.  Endoplasma  finely  gra¬ 
nulated.  Macronucleus  forming  a  long  and 
thick  rod,  dilated  at  the  ends  and  sometimes 
undulating;  it  runs,  longitudinally  and  some 
times  a  little  obliquely,  through  nearly  the 
whole  body.  Micronucleus  spindleshaped, 
generally  far  from  the  macronucleus  and  near 
to  the  cellular  membrane.  On  each  side  of 
the  macronuclens  a  row  of  (generally  three) 
vacuoles,  all  of  them  appearing  spherical  but 
varying  in  size. 
Dimensions  :  About  85 :  65  micro. 
Habitat:  Digestive  tract  of  Polydora  so- 
cialis. 
Selenidium  cruzi  FARIA,  CUNHA  and 
FONSECA,  1917. 
This  gtegarine  belongs,  in  our  opinion, 
to  the  suborder  Schizogregarinae,  though  we 
never  observed  the  forms  of  multiple  divisi¬ 
on,  characteristical  of  this  suborder;  taking  in 
account  the  form  of  the  trophozoite,  we  in¬ 
clude  it  in  the  genus  Selenidium  GIARD. 
Description  :  —  As  mentioned  before, 
our  description  is  limited  to  the  forms  of 
the  trophozoite,  as  we  did  not  meet  with 
any  other  stage  in  the  evolution  of  this  or¬ 
ganism. 
Trophozoite  elongated,  slightly  flattened, 
vermiform  and  longitudinally  striated  by 
myonema  fibrils,  about  eight  on  each  face. 
Anterior  end  less  attenuated  than  the  po¬ 
sterior  one  and  provided  with  a  short  epi- 
merite. 
Nucleus  stretched  in  longitudinal  direc¬ 
tion,  situated  in  the  middle  of  the  body  and 
showing,  in  one  of  the  ends,  a  caryosome, 
in  which  a  centriole  is  sometimes  perceived. 
Near  the  caryosome  we  sometimes  find 
a  small  granulation,  very  rich  in  chromatin, 
which  is  likely  to  represent  the  centriole, 
emigrated  from  the  interior  of  the  caryosome. 
Nearly  all  the  chromatin  is  accumulated  in 
the  caryosome. 
Dimensions:  100-160:  15-25  micra. 
Habitat  :  Digestive  tract  of  Polyaora  so- 
cialis. 
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