﻿Classification 
  of 
  the 
  Order 
  Microcyprini. 
  321 
  

  

  There 
  remain, 
  then, 
  for 
  consideration 
  only 
  the 
  Esocidge, 
  

   Umbiidas, 
  and 
  Dalliidae, 
  the 
  Haplorai 
  sensu 
  sirictu, 
  and 
  the 
  

   Cyprinodontidge 
  and 
  Amblyopsidse, 
  for 
  which 
  I 
  have 
  proposed 
  

   the 
  ordinal 
  name 
  Microcyprini. 
  

  

  These 
  two 
  groups 
  resemble 
  each 
  other 
  in 
  the 
  absence 
  of 
  a 
  

   mesocoracoid 
  and 
  an 
  orbitosphenoid, 
  the 
  separation 
  of 
  the 
  

   parietals 
  by 
  the 
  supraoccipital, 
  &c, 
  but 
  they 
  differ 
  widely 
  in 
  

   other 
  respects, 
  and 
  do 
  not 
  seem 
  to 
  be 
  closely 
  related. 
  

  

  The 
  Haplomi 
  are 
  physostomous, 
  the 
  maxillary 
  enters 
  the 
  

   gape, 
  the 
  mesethmoid 
  is 
  represented 
  by 
  a 
  pair 
  of 
  dermal 
  

   bones, 
  and 
  the 
  ribs 
  are 
  borne 
  on 
  autogenous 
  parapophyses 
  *. 
  

   The 
  Microcyprini 
  appear 
  to 
  be 
  physoclistic, 
  the 
  mouth 
  is 
  

   bordered 
  above 
  by 
  the 
  prsemaxiliaries 
  only, 
  the 
  mesethmoid 
  

   is 
  unpaired, 
  and 
  all 
  or 
  most 
  of 
  the 
  ribs 
  are 
  inserted 
  on 
  strong 
  

   transverse 
  processes. 
  Whereas 
  the 
  Haplomi 
  show 
  relation- 
  

   ship 
  to 
  the 
  most 
  generalized 
  isospondylous 
  fishes, 
  the 
  Micro- 
  

   cyprini 
  bear 
  more 
  resemblance 
  to 
  the 
  Salmopercse 
  and 
  

   Synentognathi, 
  especially 
  the 
  latter. 
  

  

  Order 
  MICROCYPRINI. 
  

  

  Malacopterous 
  physoclists 
  with 
  abdominal 
  pelvic 
  fins, 
  each 
  

   of 
  6 
  or 
  fewer 
  rays. 
  No 
  lateral 
  line. 
  Mouth 
  terminal, 
  

   bordered 
  above 
  by 
  the 
  prEemaxillaries 
  ; 
  second, 
  third, 
  and 
  

   fourth 
  upper 
  pharyngeals 
  dentigerous 
  ; 
  lower 
  pharyngeals 
  

   either 
  separate, 
  or 
  if 
  united 
  with 
  the 
  median 
  suture 
  persistent 
  ; 
  

   branchiostegals 
  6 
  or 
  less. 
  Parietals 
  separated 
  by 
  supra- 
  

   occipital 
  ; 
  mesethmoid 
  unpaired 
  ; 
  no 
  orbitosphenoid 
  ; 
  ali- 
  

   sphenoids 
  well 
  separated; 
  basisphenoid, 
  when 
  present, 
  small, 
  

   free 
  superiorly 
  ; 
  roof 
  of 
  mj'odome 
  membranous 
  or 
  thinly 
  

   ossified 
  ; 
  a 
  short 
  occipital, 
  but 
  no 
  parietal 
  crests. 
  Pectoral 
  

   arch 
  attached 
  to 
  skull; 
  post-temporal 
  foiked, 
  or 
  the 
  lower 
  

   limb 
  sometimes 
  ligamentous 
  ; 
  supra-cleithrum 
  small 
  ; 
  no 
  

   mesocoracoid 
  ; 
  radials 
  4, 
  short 
  and 
  broad, 
  2 
  or 
  '6 
  on 
  hyper- 
  

   coracoid. 
  Vertebral 
  column 
  of 
  solid 
  centra 
  which 
  are 
  

   co-ossified 
  with 
  the 
  arches; 
  all 
  or 
  most 
  of 
  the 
  prsecaudals 
  

   with 
  strong 
  parapophyses 
  bearing 
  the 
  ribs 
  ; 
  epipleurals, 
  but 
  

   no 
  epineurals 
  ; 
  ribs 
  commencing 
  on 
  second 
  vertebra 
  ; 
  no 
  

   upurned 
  centra 
  at 
  base 
  of 
  caudal 
  fin; 
  hypurals 
  ankylosed 
  

   with 
  the 
  last 
  centrum. 
  

  

  I 
  have 
  examined 
  a 
  number 
  of 
  genera, 
  and 
  I 
  believe 
  that 
  

   all 
  are 
  physoclistic, 
  but 
  I 
  have 
  not 
  undertaken 
  the 
  detailed 
  

   research 
  necessary 
  to 
  establish 
  this. 
  Valenciennes 
  came 
  to 
  

  

  * 
  Cf. 
  Starks, 
  Biol. 
  Bull. 
  vii. 
  1904, 
  p. 
  254, 
  and 
  Zool. 
  Jahrb. 
  1904, 
  

   p. 
  249. 
  

  

  