NEW  SPECIES  OF  CALYPTR^ID^. 
199 
Diam.  1  poll.,  lat.  4,  alt. 
Hah.  ad  Panamam. 
Found  on  stones  in  sandy  mud,  at  a  depth  of  from  six  to  ten  fathoms. 
8.  Calyptr^a  lignaria. 
Tab.  XXVII.  Fig.  8. 
Cal.  testa  crassd,  fused,  deformi,  striis  corrugatd;  apice  prominente,  suhadunco,  acuto, 
posteriore. 
Diam.  1  ,*o  poll.,  lat.  I,  alt.  -|-. 
Hah.  in  America  Centrali.    (Real  Llejos.) 
The  majority  of  individuals  of  this  species  have  their  shells  so  deformed  that  they 
set  description  at  defiance  ;  the  comparatively  well-formed  shell  occurs  so  rarely,  that 
it  may  be  almost  considered  as  the  exception  to  the  rule.  When  in  this  last-mentioned 
state,  the  circumference  of  the  shell  is  an  irregular  somewhat  rounded  oval,  and  it  rises 
into  a  form  somewhat  resembling  the  back  of  Ancylus,  with  the  apex  very  sharp  and 
inclining  downwards.  The  shell  in  this  shape  is  generally  less  corrugated  than  it  is  in 
deformed  individuals,  though  some  of  those  are  comparatively  smooth ;  but,  in  both 
states,  the  shell  is  striated  immediately  under  the  apex,  and  is,  for  the  most  part,  cor- 
rugated on  the  other  side  of  it. 
Found  under  stones. 
Var.  a.  Enormiter  conica,  cyatho  valde  profundo. 
Tab.  XXVII.  Fig.  8*. 
This  variety  is  often  one  inch  and  six  eighths  in  height,  and  its  cup  nearly  one  inch 
deep,  while  the  diameter  of  the  shell  at  the  aperture  does  not  exceed  one  inch. 
Found  on  shells  in  sandy  mud,  at  the  depth  of  four  fathoms,  at  the  island  of  Chiloe. 
9.    CALYPTRiEA  TENUIS. 
Tab.  XXVII.  Fig.  9. 
Cal.  testd  irregulari,  tenui,  suhdiaphand,  creherrime  striata,  alhidd,  interdum  fusco  pallide 
strigatd. 
Diam.  1  poll.,  alt.  -^r. 
Hah.  ad  Peruvise  oras.    (Saraanco  Bay.) 
Found  on  living  shells  in  muddy  sand,  at  a  depth  of  nine  fathoms. 
