﻿Marsipubranchs 
  of 
  the 
  Order 
  Ilyperoartii. 
  195 
  

  

  Synopsis 
  of 
  the 
  Species. 
  

  

  I. 
  Enlarged 
  cusps 
  of 
  anterior 
  lingual 
  lamina 
  small, 
  the 
  denticulated 
  

  

  ridge 
  evident. 
  

  

  The 
  two 
  most 
  anterior 
  of 
  the 
  radial 
  series 
  of 
  labial 
  teeth 
  

   meet 
  behind 
  and, 
  diverging 
  in 
  front, 
  are 
  separated 
  by 
  

   a 
  single 
  tooth 
  1. 
  lapicida. 
  

  

  The 
  two 
  most 
  anterior 
  of 
  the 
  radial 
  series 
  of 
  labial 
  teeth 
  

  

  are 
  entirely 
  separated 
  by 
  a 
  group 
  of 
  three 
  teeth 
  .... 
  2. 
  mordax. 
  

  

  II. 
  Enlarged 
  cusps 
  of 
  anterior 
  lingual 
  lamina 
  very 
  strong, 
  hiding 
  the 
  

  

  denticulated 
  ridges 
  3. 
  acutidens. 
  

  

  1. 
  Mordacia 
  lapicida. 
  

  

  Caragola 
  lapicida, 
  Gray, 
  Ohondropt. 
  p. 
  143, 
  pi. 
  i. 
  fig. 
  5 
  (1851), 
  or 
  Proc. 
  

  

  Zool. 
  Soc. 
  1851, 
  p. 
  239. 
  

   Mordacia 
  mordax 
  (part.), 
  Giinth. 
  Cat. 
  Fish. 
  viii. 
  p. 
  507 
  (1870). 
  

   Mordacia 
  lapicida, 
  Plate, 
  Zool. 
  Jahrb. 
  Suppl. 
  v. 
  1902, 
  p. 
  656, 
  pL 
  xix. 
  

  

  figs. 
  3-4. 
  

  

  Chile. 
  

   1, 
  160 
  mm. 
  (type 
  of 
  the 
  species). 
  Valparaiso. 
  

  

  2. 
  Mordacia 
  mordax. 
  

  

  Petromyzon 
  mordax, 
  Richards. 
  Ereb. 
  & 
  Terr. 
  Fish. 
  p. 
  62, 
  pi. 
  xxxviii. 
  

  

  figs. 
  3-6 
  (1848). 
  

   Mordacia 
  mordax, 
  Gray, 
  Ohondropt. 
  p. 
  144, 
  pi. 
  i. 
  fig. 
  6 
  (1851), 
  or 
  

  

  Proc. 
  Zool. 
  Soc. 
  1851, 
  p. 
  239, 
  pi. 
  iv. 
  fig. 
  6 
  ; 
  Ogilb. 
  Proc. 
  Linn. 
  Soc. 
  

  

  N.S.W. 
  xxi. 
  1896, 
  p. 
  400; 
  Plate, 
  Zool. 
  Jahrb. 
  Suppl. 
  v. 
  1902, 
  

  

  p. 
  654, 
  pi. 
  xix. 
  figs. 
  1-2. 
  

   Mordacia 
  mordax 
  (part.), 
  Giinth. 
  Cat. 
  Fish. 
  viii. 
  p, 
  507 
  (1870). 
  

  

  New 
  South 
  Wales 
  ; 
  Victoria 
  ; 
  Tasmania. 
  

  

  1. 
  250 
  mm. 
  (type 
  of 
  the 
  speeies). 
  Tasmania. 
  Haslar 
  ColL 
  

  

  2. 
  330 
  mm. 
  „ 
  M. 
  Allport, 
  Esq. 
  

  

  3. 
  Mordacia 
  acutidens. 
  

  

  ? 
  Petromyzon 
  anwandteri, 
  Philippi, 
  Arch. 
  f. 
  Nat. 
  1863, 
  p. 
  207, 
  pi. 
  x. 
  

  

  fig. 
  b. 
  

   Petromyzon 
  acutidens, 
  Philippi, 
  ib. 
  1864, 
  p. 
  107, 
  or 
  Ann. 
  & 
  Mag. 
  Nat. 
  

  

  Hist. 
  xvi. 
  1865, 
  p. 
  221. 
  

   Mordacia 
  acutidens, 
  Plate, 
  Zool. 
  Jahrb. 
  Suppl. 
  v. 
  1902, 
  p. 
  657, 
  pi. 
  xix. 
  

  

  figs. 
  5-6. 
  

  

  Chile. 
  

   1-2. 
  320-330 
  mm. 
  Chile. 
  Gerrard. 
  

  

  13* 
  

  

  