﻿196 
  Mr. 
  C. 
  T. 
  Regan— 
  A 
  Synopsis 
  of 
  the 
  

  

  2. 
  Geotria. 
  

  

  Geotria, 
  Gray, 
  Chondropt. 
  p. 
  142 
  (1851) 
  ; 
  Giinth. 
  Cat. 
  Fish. 
  viii. 
  p. 
  508 
  

  

  (1870). 
  

   Velasia, 
  Gray, 
  I. 
  c. 
  

  

  Yarra, 
  Casteln. 
  Proc. 
  Zool. 
  Soc. 
  Vict. 
  i. 
  1872, 
  p. 
  231. 
  

   Neomordacia, 
  Casteln. 
  t. 
  c. 
  p. 
  232. 
  

   Exomeyas, 
  Gill, 
  Proc. 
  U.S. 
  Nat. 
  Mus. 
  v. 
  1882, 
  p. 
  524. 
  

   Macr 
  ophthalmia, 
  Plate, 
  Sitzungsb. 
  Ges. 
  naturf. 
  Fr. 
  Berlin, 
  1897, 
  p. 
  137. 
  

  

  Disc 
  covered 
  with 
  radially 
  arranged 
  teeth. 
  A 
  single 
  broad 
  

   quadricuspid 
  supraoral 
  lamina 
  ; 
  infraoral 
  lamina 
  usually 
  

   weakly 
  cuspidate. 
  Anterior 
  lingual 
  lamina 
  bi- 
  or 
  tricuspid. 
  

  

  Dorsal 
  fins 
  separate. 
  

  

  Australia; 
  New 
  Zealand 
  ; 
  Chile. 
  

  

  Synopsis 
  of 
  the 
  Species. 
  

  

  I. 
  Disc 
  small, 
  with 
  the 
  labial 
  teeth 
  close 
  together, 
  almost 
  imbricating 
  ; 
  

  

  gular 
  pouch 
  small 
  or 
  absent. 
  ( 
  Velasia.) 
  

   Inner 
  pair 
  of 
  supraoral 
  cusps 
  spatulate 
  ; 
  anterior 
  

  

  lingual 
  plate 
  bicuspid, 
  the 
  cusps 
  very 
  strong 
  ; 
  

  

  length 
  of 
  base 
  of 
  first 
  dorsal 
  considerably 
  more 
  

  

  than 
  its 
  distance 
  from 
  the 
  second 
  1. 
  chilensis. 
  

  

  Inner 
  pair 
  of 
  supraoral 
  cusps 
  either 
  ovate 
  or 
  triangular 
  

  

  and 
  acutely 
  pointed 
  ; 
  anterior 
  lingual 
  plate 
  usually 
  

  

  tricuspid 
  ; 
  length 
  of 
  base 
  of 
  first 
  dorsal 
  from 
  a 
  

  

  little 
  less 
  to 
  a 
  little 
  more 
  than 
  its 
  distance 
  from 
  

  

  the 
  second 
  2. 
  stenostoma. 
  

  

  II. 
  Disc 
  large, 
  with 
  the 
  labial 
  teeth 
  well 
  separated 
  ; 
  a 
  gular 
  pouch. 
  

  

  {Geotria.) 
  

  

  A. 
  Supraoral 
  lamina 
  prominent. 
  

  

  Lateral 
  cusp 
  of 
  supraoral 
  lamina 
  broader 
  than 
  the 
  ad- 
  

   jacent 
  lateral 
  part 
  of 
  the 
  lamina, 
  from 
  which 
  it 
  is 
  

   separated 
  by 
  a 
  groove 
  ; 
  anterior 
  lingual 
  tooth 
  

   tricuspid; 
  base 
  of 
  first 
  dorsal 
  fin 
  a 
  little 
  shorter 
  

   than 
  its 
  distance 
  from 
  the 
  second 
  3. 
  saccifera. 
  

  

  Lateral 
  cusp 
  of 
  supraoral 
  lamina 
  narrower 
  than 
  the 
  

   adjacent 
  lateral 
  part 
  of 
  the 
  lamina; 
  anterior 
  

   lingual 
  tooth 
  bicuspid 
  ; 
  base 
  of 
  first 
  dorsal 
  longer 
  

   than 
  its 
  distance 
  from 
  the 
  second 
  4. 
  australis. 
  

  

  B. 
  Supraoral 
  lamina 
  hidden 
  ; 
  anterior 
  lingual 
  tooth 
  tricuspid 
  ; 
  base 
  

  

  of 
  first 
  dorsal 
  much 
  longer 
  than 
  its 
  distance 
  from 
  the 
  second. 
  

  

  5. 
  macrostomus. 
  

  

  1 
  . 
  Geotria 
  chilensis. 
  

  

  Velasia 
  chilensis, 
  Gray, 
  Chondropt. 
  p. 
  143, 
  pi. 
  i. 
  fig. 
  4 
  (1851). 
  

   Geotria 
  chilensis 
  (part.), 
  Giinth. 
  Cat. 
  Fish. 
  viii. 
  p. 
  509 
  (1870). 
  

  

  1. 
  380 
  mm. 
  (type 
  of 
  the 
  species). 
  Chile. 
  

  

  