NEW SPECIES OF CALYPTRAIDZ. 205 
Found on dead shells dredged from sandy mud, at a depth ranging from six to ten 
fathoms. 
29. CaLYPTRHA EXCAVATA. 
Tab. XXIX. Fig. 7. 
Cal. testd crassiusculd, subtortuosd, levi, albidd vel subflavd fusco punctatd et strigatd, 
itis albd, limbo interdum fusco ciliato-strigato. 
Long. 12 poll., lat. 12, alt. 4. 
Hab. 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. ewcavata. The apex is close to the margin, obliquely turned towards 
the right side. 
The dimensions are taken from the largest specimen. 
30. CaLYPTRHA ARENATA. 
Tab. XXIX. Fig. 8. 
Cal. testé subovatd, albidd rubro-fusco creberrimé punctatd, intis subrubrd vel albidd 
subrubro maculata, septo albo. 
Long. 1+ poll., lat. 2, 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. CALYPTREA MARGINALIS. 
Tab. XXIX. Fig. 9. 
Cal. testé subovatd, sublevi vel via corrugatd, subflavd vel albidd fusco strigatd, intus 
nigricante vel flavd fusco strigatd, septo albo. 
Long. 1+ poll., lat. +2, alt. +45. 
Hab. 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. Catyprr@a SQuaMa. 
Tab. XXIX. Fig. 10. 
Cal. testd suborbiculari, complanatd, sublevi, subtenui, pallidé flavd vel albidé fusco sub- 
strigatd, intus subflavéd vel subflavd fusco strigatd. 
252 
