198 
MR.  BRODERIP'S  DESCRIPTIONS  OF  SOME 
Diam.  -f  poll.,  alt.  4-. 
Hah.  ad  Aricam  Pemvise. 
Dredged  up  from  sandy  mud  at  a  depth  of  nine  fathoms. 
Subgenus  Calypeopsis,  Less. 
Cyatho  interno  integro,  lateraliter  adhserente. 
Before  I  proceed  to  describe  the  species  of  this  subgenus  which  appear  to  me  to  be 
new,  I  must  refer  to  the  finest  specimens  of  Cal.  Eoctinctorium,  Lam.,  and  of  Cal.  spi- 
nosa,  Sow.,  and  its  varieties,  that  I  have  hitherto  seen.  The  specimen  of  Cal.  Extinc- 
torium  was  taken  by  Mr.  Cuming  at  Guaymas  in  the  Gulf  of  California :  its  length  is 
2-1- inches,  its  breadth  2f,  and  its  height  1-i-.  The  large-spined  varieties  of  Cal.  spinosa 
(Tab.  XXVIII.  fig.  8.)  were  found  under  stones  at  low  water  at  St.  Elena  and  at  Lobos 
Island,  and  some  small-spined  varieties  were  dredged  from  sandy  mud,  adhering  to 
stones  and  shells,  at  a  depth  of  from  six  to  eight  fathoms,  at  St.  Elena.  In  all  the 
varieties  the  spines  are  tubular.  The  originals  are  in  Mr.  Cuming's  collection.  It 
will  be  observed  that  the  specimen  of  Cal.  spinosa  is  so  flat  that  the  edge  of  the  cup  is 
considerably  below  the  margin  of  the  external  shell,  whereas  the  species  is  generally 
more  or  less  conical,  the  apex  of  the  cone  often  rising  to  a  fair  height. 
6.  Calyptr^a  radiata. 
Tab.  XXVII.  Fig.  6. 
Cal.  testd  conico-orbiculari,  albidd  fusco  radiatd,  striis  longitudinalibus  crebris ;  limbo  cre- 
nulato ;  apice  acuto,  subrecurvo  ;  cyatho  depresso. 
Diam.  1  poll.,  alt. 
Hab.  in  America  Meridionali.    (Bay  of  Caraccas.) 
The  cup  of  this  pretty  species  is  pressed  in,  as  it  were,  on  one  side,  and  adheres  to 
the  shell,  not  only  by  its  apex,  but  also  by  a  lateral  seam,  which  scarcely  reaches  to  the 
rim  of  the  cup.  The  apex  of  the  younger  specimens,  both  externally  and  internally,  is 
generally  of  a  rich  brown,  and  there  can  be  little  doubt  that  when  first  produced  they 
are  entirely  of  that  colour. 
Found  in  sandy  mud  on  dead  shells,  at  a  depth  of  from  seven  to  eight  fathoms. 
7.  Calyptrjea  imbricata. 
Tab.  XXVII.  Fig.  7. 
Cal.  testd  albidd,  crassd,  subconicd,  ovatd,  costis  longitudinalibus  et  squamis  transversis 
imbricatd;  apice  subincurvo,  acuto ;  limbo  crenato ;  cyatho  depresso. 
