NEW  SPECIES  OF  CALYPTRiEID^. 
203 
21.    CALYPTRiEA  DILATATA,  Lam. 
Varietas  intus  nigro-castanea. 
Tab.  XXVIII.  Fig.  11. 
Cal.  testa  sordide  alba  castaneo  strigatd,  intus  nitide  nigro-castaned,  lamind  alba. 
Diam.  If  poll.,  lat.  If,  alt.  f . 
Hab.  ad  Valparaiso. 
This  highly  coloured  variety  was  found  on  exposed  rocks  at  low  water.  The  pure 
white  of  the  plate  shows  to  great  advantage,  lying  above  the  rich  back  ground  of  the 
interior  of  the  shell.    In  some  individuals  this  internal  colour  is  all  but  black. 
22.  CalyptryEA  strigata. 
Tab.  XXVIII.  Fig.  12. 
Cal.  testd  subcorrugatd,  sordide  rubrd  albo  varid,  intus  subrufd  interdum  albd  vel  alba 
rubro-castaneo  varid. 
Diam.  1  poll. 
Hab.  ad  Valparaiso. 
This  varies  much  both  in  colour  and  shape.  Some  of  the  specimens  are  quite  flat, 
and  the  plate  is  almost  convex.  An  obscure,  subarcuate,  longitudinal,  whitish,  broad 
streak  may  be  traced  on  the  backs  of  most  of  them.  It  is  not  impossible  that  it  may 
be  a  variety  of  Cal.  dilatata. 
Found  on  Mytili  at  depths  varying  from  three  to  six  fathoms. 
23.  CALYPTRyEA  EcHINUS. 
Tab.  XXIX.  Fig.  1. 
Cal.  testd  albidd  violaceo  maculatd,  interdum  fused,  striis  longitudinalibus  creberrimis, 
spinis  fornicatis  horridd,  intiis  Jiavente  vel  albd. 
Diam.  1+  poll.,  lat.  If,  alt  f. 
Hab.  ad  Peruviam.    (Lobos  Island.) 
In  old  specimens  the  spines  are  almost  entirely  worn  down,  and  rough  stria  only  for 
the  most  part  remain.  In  this  state  it  bears  a  great  resemblance  to  the  figure  given  of 
Crepidula  fornicata  in  Mr.  Sowerby's  '  Genera  of  Shells',  No.  23.  f.  1. 
Found  under  stones  at  low  water. 
24.  Calyptr^a  Hystrix. 
Tab.  XXIX.  Fig.  2. 
Cal.  sordide  albd  vel  fused,  complanatd,  longitudinaliter  striatd,  spinis  magnis  fornicatis 
apertis  seriatim  dispositis,  intus  albidd  interdum  castaneo  maculatd. 
Diam.  If  poll.,  lat.  f,  alt.  f . 
VOL,  I.  2  E 
