﻿46 
  PROCEEDINGS 
  OF 
  THE 
  NATIONAL 
  MUSEUM 
  vol.98 
  

  

  species, 
  I 
  have 
  concluded 
  that 
  generically 
  they 
  should 
  not 
  be 
  separated 
  

   and 
  that 
  Kronia 
  and 
  Pseudothyrina 
  belong 
  in 
  this 
  group, 
  and 
  that 
  

   they 
  are 
  not 
  generically 
  distinct 
  from 
  Odontestkes. 
  

  

  All 
  counts 
  given 
  in 
  the 
  key 
  were 
  made 
  on 
  the 
  specimens 
  listed 
  above 
  

   and 
  involved 
  10 
  counts 
  for 
  fin 
  rays. 
  

  

  Both 
  specimens 
  of 
  0. 
  perugiae 
  had 
  IV-I, 
  i, 
  7 
  dorsal 
  rays, 
  and 
  I, 
  i, 
  13 
  

   and 
  I, 
  i, 
  14 
  anal 
  rays. 
  

  

  On 
  May 
  1, 
  1945, 
  1 
  wrote 
  to 
  Prof. 
  Paulo 
  de 
  Miranda 
  Ribeiro, 
  Museu 
  

   Nacional, 
  Rio 
  de 
  Janeiro, 
  and 
  in 
  a 
  letter 
  dated 
  June 
  25 
  I 
  received 
  from 
  

   him 
  the 
  following 
  information 
  concerning 
  the 
  genotypes 
  of 
  

   Pseudothyrina 
  and 
  Kronia 
  (figs. 
  8, 
  9), 
  and 
  for 
  this 
  data 
  I 
  express 
  my 
  

   sincere 
  thanks 
  to 
  him 
  : 
  

  

  The 
  type, 
  only 
  known 
  specimen, 
  of 
  Pseudothyrina 
  iheringi 
  Ribeiro 
  

   has 
  the 
  body 
  cavity 
  extending 
  into 
  the 
  haemal 
  canal 
  ; 
  the 
  origin 
  of 
  first 
  

   dorsal 
  one 
  and 
  one-half 
  series 
  of 
  scales 
  in 
  front 
  of 
  the 
  origin 
  of 
  anal 
  

   fin; 
  origin 
  of 
  the 
  second 
  dorsal 
  over 
  eleventh 
  ray 
  of 
  anal. 
  "Teeth 
  

   disposed 
  irregularly, 
  especially 
  on 
  lower 
  jaw 
  (mandible) 
  giving 
  the 
  

   impression 
  of 
  bands, 
  tending 
  however 
  to 
  arrange 
  themselves 
  into 
  two 
  

   series 
  (especially 
  on 
  the 
  maxilla) 
  ; 
  they 
  are 
  conical, 
  curved, 
  and 
  strong; 
  

   the 
  first 
  series 
  placed 
  close 
  to 
  margin 
  of 
  jaw, 
  there 
  being 
  between 
  this 
  

   series 
  and 
  the 
  next 
  a 
  space 
  that 
  would 
  serve 
  for 
  location 
  of 
  another 
  

   series 
  ; 
  I 
  came 
  across 
  no 
  vomerine 
  teeth." 
  The 
  following 
  counts 
  were 
  

   sent 
  : 
  "1st 
  dorsal 
  4 
  ; 
  2d 
  dorsal 
  91/2 
  ; 
  anal 
  18 
  ; 
  pectoral 
  15 
  ; 
  lateral 
  line 
  53 
  ; 
  

   vertical 
  [scale 
  row] 
  under 
  1st 
  ray 
  of 
  2d 
  dorsal, 
  9 
  ; 
  under 
  1st 
  ray 
  of 
  

   1st 
  dorsal, 
  11." 
  The 
  belly 
  was 
  compressed, 
  and 
  no 
  sheath 
  of 
  scales 
  

   was 
  observed 
  along 
  the 
  anal 
  base. 
  

  

  I 
  find 
  no 
  outstanding 
  differences 
  that 
  separate 
  Pseudothyrina 
  from 
  

   Odontesthes 
  and 
  therefore 
  refer 
  it 
  to 
  the 
  synonymy 
  of 
  the 
  latter 
  genus. 
  

  

  The 
  following 
  was 
  furnished 
  from 
  the 
  type, 
  only 
  known 
  specimen, 
  

   of 
  Kronia 
  iguapensis 
  Ribeiro: 
  "The 
  body 
  cavity 
  reaches 
  half 
  the 
  

   distance 
  between 
  the 
  anus 
  (vent) 
  and 
  first 
  anal 
  ray, 
  then 
  narrowing 
  

   and 
  penetrating 
  the 
  haemal 
  channel 
  (canal)." 
  He 
  says 
  that 
  the 
  first 
  

   ray 
  of 
  the 
  second 
  dorsal 
  fin 
  is 
  over 
  the 
  fourteenth 
  anal 
  ray; 
  

   the 
  distance 
  from 
  the 
  first 
  ray 
  of 
  first 
  dorsal 
  to 
  first 
  ray 
  of 
  second 
  

   dorsal 
  is 
  contained 
  four 
  times 
  in 
  the 
  distance 
  from 
  tip 
  of 
  snout 
  to 
  

   first 
  dorsal 
  origin; 
  the 
  first 
  ray 
  of 
  first 
  dorsal 
  is 
  over 
  the 
  anus. 
  "The 
  

   dentition 
  is 
  a 
  good 
  deal 
  damaged, 
  placing 
  difficulties 
  to 
  a 
  good 
  under- 
  

   standing 
  thereof; 
  we 
  can, 
  however, 
  say 
  that 
  it 
  consists 
  of 
  relatively 
  

   long 
  teeth, 
  conical 
  and 
  slightly 
  curved 
  inwards 
  and 
  tending 
  to 
  form 
  

   two 
  series, 
  the 
  exterior 
  being 
  implanted 
  close 
  to 
  the 
  [outer] 
  border 
  

   of 
  the 
  jaws 
  and 
  the 
  second 
  removed 
  by 
  a 
  space 
  that 
  would 
  permit 
  the 
  

   implantation 
  of 
  another 
  series; 
  all 
  the 
  teeth 
  on 
  the 
  mandible 
  are 
  

   broken 
  ; 
  those 
  of 
  the 
  second 
  [inner 
  row] 
  tending 
  same 
  way. 
  Those 
  on 
  

   the 
  vomer 
  seem 
  to 
  have 
  been 
  placed 
  in 
  series, 
  but 
  I 
  cannot 
  be 
  positive." 
  

   Other 
  notes 
  indicate 
  that 
  what 
  scales 
  are 
  left 
  appear 
  to 
  have 
  smooth 
  

  

  