99 
sequently,  it  must  have  a  very  wide  geogra¬ 
phic  distribution. 
We  found  the  plasmodia  of  tertian  fever 
Laverania  malariae  (G RASSI  &  FELETTÍ 
1890)  and  Plamodium  vivax  (GRASSI  &  FE- 
LETTI),  but  heard  of  no  cases  of  infection 
with  Plasmodium  malariae  LAVERAN  1881, 
causing  quartan  fever. 
Fish  microsporidia  were  conspicuous  y 
rare  during  the  whole  journey;  though  I  exa¬ 
mined  all  fishes  caught  on  excursions,  I  only 
found  one  infected  species;  this  was  Pseudopi- 
melodus  charus,  commonly  called  “pacú”.  The 
parasite  was  a  new  species  of  the  genus  tlen- 
neguya  which  Dr.  A.  M.  da  CUNHA  and  I 
described  as  H.  lutzi  (Vide  Brazil  Medico 
vol.  32  n.  52  p.  414). 
Microplankton.  As  already  explained,  I  will 
not  deal  either  with  the  potamoplankton  of 
the  rivers  Paraná  and  Pequery  or  the  limno- 
plankton  of  lake  Ipacarahy,  but  shall  only 
give  a  list  of  the  Protozoa  and  Diatomacea , 
collected  from  the  coast  of  Uruguay  (frontier 
of  Biazil)  up  to  that  of  Sta.  Catharina.  1 
found  59  species,  many  of  which  had 
not  been  found  in  brazilian  waters  before. 
A  more  minutious  study  of  these  and  of 
other  material,  collected  by  Dr.  A.  M.  da 
CUNHA,  is  now  in  the  press. 
Follows  the  list  : 
Cystoflagellata. 
1—  Noctiluca  miliaris  Suriray,  1836. 
Tintinnodea. 
2  —  Codonella  morchella  Cleve,  1900. 
3—  Tintinnopsis  beroidea  Stein,  1867. 
4—  Tintinnopsis  campanula  (Ehrenberg 
1840). 
5  —  Cyttarocylis  ehrenbergii  (Clap,  et 
Lachm.,  1858)  var.  claparedei 
(Daday,  1887). 
6  -Ptychocylis  (Rhabdonella)  apophy sa¬ 
ta  (Cleve,  1900). 
7-  Tintinnus  gany medes  Entz,  1885. 
8—  Tintinnus  lusus-undae  Entz,  1885. 
9-  Tintinnus  amphora  CI.  et  Lachm.  var. 
quadrilineatum  (Cl.  et  Lachm. 
1858) . 
Schizophyce  '. 
10  -  Richelia  intracellularis  (Schmidt, 
1901). 
J1  —  Frorocentrum  micans  Ehrenberg, 
1838. 
12  —  Dinophysis  ovum  Schuett,  1895. 
1 3  —  Dinophysis  schuetti  Murray  et 
Whitting,  1S99. 
14  —  Dinophysis  homunculus  Stein,  1883. 
15  —  Glenodinium  trochoideum  Stein, 
1883. 
16  —  Goniodoma  polyedricum  (Pouchet) 
Joergensen,  1899. 
17  —  Peridinium  steini  Joergensen,  1889. 
18  —  Petidinium  depressum  Bailey,  1855. 
19  —  Peridinium  divergeas  Ehrenberg, 
1840. 
It)  — Peridinium  pentagonum  Gran,  1902. 
21  —  Oxytoxum  scolopax  Stein,  1883. 
22  -Oxytoxum  milneri  Murray  Whit¬ 
ting,  1899. 
23  —Ceratocorys  hórrida  Stein,  1883. 
24  —  Cetatium  candelabrum  ( Ehrenberg) 
Stein,  1883. 
25  —Ceratium  furca  (Ehrenberg)  Clap. 
et  Lachm,  1859. 
26  —  Ceratium  fus  us  (Ehrenberg,  1883) 
Dujaidin,  1841. 
21  — Ceratium  incisum  (Karsten,  1906). 
28  —  Ceratium  belone  Cleve,  1900. 
29  —  Ceratium  pentagonum  Gourret, 
1883. 
30—  Ceratium  penatum  Kofoid,  1907. 
31  —  Ceratium  palmatum  (Schroeder, 
1900)  Schroeder  var.  ranipes , 
Cleve. 
32  —  Ceratium  massiliense Gourret,  1883. 
33-  Ceratium  trichoceros  (Ehrenberg, 
1859)  Kofoid,  1908. 
34 - Ceratium  tripos  (O.  F.  Mueller, 
Mil). 
35-  Ceratium  gibberum  Gourret,  1883. 
35a  -  Ceratium  gibberum  Gourret,  1883 
forma  sinistrum  Gourret,  1883. 
