﻿318 
  PROCEEDINGS 
  OF 
  THE 
  MALACOLOGICAL 
  SOCIETY. 
  

  

  hinder 
  portion 
  stained 
  with 
  rosaceous, 
  the 
  colour 
  in 
  two 
  more 
  or 
  less 
  

   suffused 
  rays. 
  The 
  radiating 
  riblets 
  upon 
  the 
  middle 
  of 
  the 
  valves 
  are 
  

   very 
  faintly 
  convex, 
  and 
  separated 
  by 
  mere 
  impressed 
  lines. 
  These 
  

   become 
  more 
  distinct 
  grooves 
  both 
  anteriorly 
  and 
  behind. 
  The 
  lines 
  

   of 
  growth 
  are 
  distinct 
  in 
  the 
  grooves, 
  and 
  in 
  the 
  impressed 
  striee 
  

   produce 
  an 
  almost 
  punctate 
  appearance. 
  

  

  Bkachtdontes 
  (Hormomta) 
  ritfolineatus, 
  n.sp. 
  

  

  Testa 
  elongata, 
  radiatim 
  et 
  concentrice 
  lirata, 
  undique 
  granulata, 
  

   periostraco 
  hirsute 
  induta, 
  sordide 
  albida, 
  postice 
  rufo 
  maculata 
  et 
  

   lineata 
  ; 
  margo 
  cardinalis 
  supra 
  ligamentum 
  brevis, 
  rectus, 
  postice 
  vix 
  

   angulatus 
  ; 
  margo 
  ventralis 
  leviter 
  incurvatus 
  ; 
  valvae 
  tenues, 
  ad 
  

   marginem 
  intus 
  denticulatae, 
  iridescentes, 
  rufo 
  lineatae 
  et 
  variegatse 
  ; 
  

   margo 
  cardinis 
  ante 
  ligamentum 
  dentibns 
  tribus 
  validis, 
  quatuor 
  

   minoribus 
  posticis 
  instructus 
  ; 
  umbones 
  pallidi, 
  nitentes, 
  concentrice 
  

   striati, 
  baud 
  radiatim 
  sculpti. 
  Long. 
  10'5, 
  alt. 
  5'5, 
  diam. 
  5"3 
  mm. 
  

  

  Hah. 
  — 
  Flying 
  Fish 
  Cove, 
  in 
  30 
  fathoms. 
  

  

  Allied 
  to 
  Brachjdontes 
  {Hormomya) 
  Karachietisis, 
  Melvill 
  & 
  Standen, 
  

   but 
  different 
  in 
  form, 
  owing 
  to 
  the 
  shorter 
  hinge-line 
  and 
  the 
  less 
  

   marked 
  dorsal 
  angle. 
  The 
  concentric 
  sculpture 
  in 
  the 
  present 
  species 
  

   is 
  also 
  stronger, 
  causing 
  the 
  radiating 
  lirseto 
  be 
  more 
  gi'anulous. 
  The 
  

   colour-markings 
  constitute 
  another 
  distinguishing 
  feature, 
  and 
  the 
  

   periostracum 
  in 
  Karachiemis 
  appears 
  to 
  be 
  of 
  a 
  less 
  hairy 
  nature. 
  

  

  The 
  margin 
  of 
  the 
  valves 
  is 
  most 
  strongly 
  denticulate 
  along 
  the 
  

   dorsal 
  and 
  hinder 
  edges, 
  and 
  somewhat 
  more 
  finely 
  on 
  the 
  ventral 
  side, 
  

   excepting 
  at 
  the 
  byssal 
  opening, 
  which 
  is 
  smooth. 
  

  

  