NEW  SPECIES  OF  CALYPTR^ID^. 
205 
Found  on  dead  shells  dredged  from  sandy  mud,  at  a  depth  ranging  from  six  to  ten 
fathoms. 
29.  Calyptr^a  excavata. 
Tab.  XXIX.  Fig.  7. 
Cal.  testa  crassiusculd,  suhtortuosd,  loevi,  alhidd  vel  suhflavd  fusco  punctatd  et  strigatd, 
intus  albd,  limbo  interdum  fusco  ciliato-strigato. 
Long.  H  poll.,  lat.  I4-,  alt. 
Hob.  ad  Real  Llejos. 
This  species  is  remarkable  for  the  depth  of  the  internal  margin  before  it  reaches  the 
septum  formed  by  the  plate.  In  Crepidula  adunca.  Sow.,  this  depth  is  even  greater 
than  it  is  in  Crep.  excavata.  The  apex  is  close  to  the  margin,  obliquely  turned  towards 
the  right  side. 
The  dimensions  are  taken  from  the  largest  specimen. 
30.  Calyptr^a  arenata. 
Tab.  XXIX.  Fig.  8. 
Cal.  testd  subovatd,  alhidd  rubro-fusco  creberrime  punctatd,  intus  subrubrd  vel  alhidd 
subrubro  maculatd,  septo  albo. 
Long,  li  poll.,  lat.  i-,  alt. 
Hab.  ad  Sanctam  Elenam. 
This  approaches  Crepidula  Porcellana,  Lam.  The  septum  is  somewhat  distant  from 
the  margin  ;  and  the  apex,  which  is  also  somewhat  distant  from  it,  is  obtuse,  and  ob- 
liquely turned  towards  the  right  side. 
From  sandy  mud  on  shells,  at  a  depth  ranging  from  six  to  eight  fathoms. 
31.    CALYPTRyEA  MARGINALIS. 
Tab.  XXIX.  Fig.  9. 
Cal.  testd  subovatd,  sublavi  vel  vix  corrugatd,  suhflavd  vel  alhidd  fusco  strigatd,  intus 
nigricante  vel  flavd  fusco  strigatd,  septo  albo. 
Long.  1-i-  poll.,  lat.  -ff,  alt, 
Hah.  ad  Panamam  et  ad  Insulam  Muerte. 
This  species  was  found  on  stones  and  shells  in  sandy  mud,  at  a  depth  ranging  from 
six  to  ten  fathoms.  The  white  septum  shows  beautifully  against  the  black  brown  of  the 
interior.  The  apex  is  almost  lost  in  the  margin,  and  is  directed  towards  the  right  side. 
32.  Calyptr^a  Squama, 
Tab.  XXIX.  Fig.  10. 
Cal.  testd  suborhiculari,  complanatd,  suhlcsvi,  suhtenui,  pallide  flavd  vel  alhidd  fusco  sub- 
strigatd,  intus  suhflavd  vel  suhflavd  fusco  strigatd. 
2  E  2 
