﻿So 
  nth- 
  African 
  Land-MoUusca. 
  471 
  

  

  to 
  be 
  fouiul. 
  The 
  jaw 
  with 
  radula 
  complete 
  was 
  secured 
  and 
  

   mounted. 
  

  

  The 
  jaw 
  has 
  a 
  small 
  central 
  projection 
  and 
  the 
  radula 
  the 
  

   formula 
  : 
  

  

  + 
  60 
  . 
  2 
  . 
  12 
  . 
  1 
  . 
  12 
  . 
  2 
  . 
  60 
  + 
  

   + 
  74. 
  1 
  . 
  74 
  + 
  . 
  

  

  Genus 
  Microkehkus 
  (continued 
  from 
  p. 
  582, 
  Part 
  II.). 
  

  

  Microkerkus 
  Jmiculiir, 
  M. 
  & 
  P. 
  (Part 
  II., 
  pi. 
  xvi. 
  figs. 
  2, 
  2a, 
  

   2 
  b, 
  parts 
  of 
  animal.) 
  

  

  K, 
  rkojj/iorm 
  fiisiculor, 
  M. 
  & 
  P., 
  Ann. 
  S. 
  A. 
  Mus. 
  p. 
  lO^^. 
  

  

  Locality. 
  Platberg, 
  Harrismith, 
  O.R.C. 
  (received 
  from 
  

   Connolly 
  per 
  H. 
  C. 
  Burnup) 
  (No. 
  8). 
  

  

  Animal. 
  — 
  Tlie 
  right 
  shell-lobe 
  somewhat 
  broadly 
  tongue- 
  

   shaped 
  and 
  short, 
  left 
  shell-lol)e 
  small 
  and 
  tongue-shaped 
  ; 
  

   left 
  dorsal 
  k)])e 
  in 
  two 
  parts, 
  the 
  posterior 
  elongate 
  and 
  the 
  

   longest. 
  Foot 
  pale 
  cokjured, 
  neck 
  and 
  tentacles 
  grey, 
  sole 
  

   of 
  foot 
  not 
  divide'd, 
  small 
  h)be 
  above 
  the 
  triangular-shaped 
  

   mucous 
  pore, 
  peripodial 
  margin 
  broad. 
  Wall 
  of 
  the 
  branchial 
  

   sac 
  dusky 
  black, 
  mottled 
  indistinctly 
  with 
  white. 
  The 
  

   kidney 
  conspicuous 
  by 
  its 
  pale 
  ochraceous 
  colour, 
  which 
  is 
  

   bordered 
  with 
  black 
  above. 
  The 
  visceral 
  sac 
  beyond 
  this 
  is 
  

   tvhitish 
  above 
  and 
  mottled 
  black 
  below. 
  Lobe 
  above 
  the 
  

   mucous 
  pure 
  sm-^11, 
  dorsal 
  surface 
  of 
  foot 
  flattened. 
  

  

  Mr. 
  Burnup 
  writes: 
  — 
  '"A 
  fine 
  thing 
  bearing 
  a 
  great 
  

   resemblance 
  both 
  in 
  shell 
  and 
  animal 
  (externally) 
  to 
  No. 
  4 
  

   {symmetricus, 
  Craven), 
  but 
  on 
  a 
  larger 
  scale." 
  

  

  Ponsonby, 
  in 
  letter 
  Nov. 
  1907, 
  says 
  this 
  species 
  appears 
  

   as 
  a 
  Natalina 
  in 
  the 
  last 
  monograph 
  of 
  the 
  Rhytididse. 
  

  

  The 
  radula 
  teeth 
  are 
  arranged 
  

   60 
  . 
  8 
  . 
  14 
  . 
  1 
  . 
  14 
  . 
  3 
  . 
  60, 
  or 
  87 
  . 
  1 
  . 
  87 
  in 
  the 
  row. 
  

  

  They 
  are 
  like 
  others 
  described 
  in 
  species 
  of 
  the 
  family. 
  

  

  '^J'he 
  marginals 
  are 
  unevenly 
  bicuspid. 
  

  

  Jaw 
  with 
  a 
  central 
  projection. 
  

  

  In 
  the 
  genitalia 
  the 
  epiuhallus 
  is 
  long, 
  the 
  accessory 
  gland 
  

   globose, 
  on 
  a 
  sliort 
  stalk. 
  The 
  spermatheca 
  large 
  and 
  

   swollen, 
  on 
  a 
  thick 
  stalk. 
  Flagellum 
  not 
  attenuate. 
  The 
  

   spermatophore 
  : 
  the 
  capsule 
  is 
  long 
  and 
  narrow, 
  and 
  the 
  

   flume 
  bears 
  spines 
  quite 
  unlike 
  any 
  I 
  have 
  found 
  in 
  allied 
  

   species 
  ; 
  there 
  are 
  two 
  main 
  branches, 
  growing 
  from 
  same 
  

   point 
  close 
  to 
  the 
  flume 
  ; 
  from 
  these, 
  again, 
  about 
  eight 
  

   curved 
  spines 
  are 
  given 
  otf, 
  gradually 
  becoming 
  shorter 
  

   towards 
  the 
  tip 
  of 
  the 
  branch. 
  

  

  There 
  are 
  30 
  spines 
  on 
  one 
  side, 
  none 
  on 
  the 
  other 
  (y^). 
  

  

  