40 



Hub. in sinu Guayaquil. (Isle ot Muerte.) 



This beautiful species, which I have named in honour of M. Lesson, 

 was found under stones :it low water. It will remind the observer of 

 the upper valves of some of the ChamcE. — W. J. B. 



Calyptr^a iNCURVA. Cal. testd fusco nigricante, tortuosd, corru- 

 gatd ; intHs nigricante, septo albo ; apice adunco: long. %, lat. ^j-, 

 alt. -i- poll. 

 Hab. ad Sanctam Elenam et ad Xipixapi. 



Found on dead shells dredged from sandy mud, at a depth ranging 

 from six to ten fathoms. — W. J. B. 



CalyptrjEA excavata. Cal. testd crassiusculd, subtortuosd, lavi, 

 albidd vel subfavd fusco punctata et strigntd ; intiis albdvel albd 

 fusco fucatd, limbo interdum fusco ciliato-strigato : long. 1 i, 

 tat. 14^, alt. I- poll. 

 Hab. ad Real Llejos. 



This species is remarkable for the depth of the internal margin be- 

 fore it reaches the septum. In Crepidula adunca, Sow., this depth is 

 even greater than it is in Crep. excavata. The apex is close to the 

 margin, and obliquely turned towards the right side. — W. J. B. 



Calyptr^a arenata. Cal. testd subovatd, albidd rubro-fusco cre- 

 berrime punctatd ; infils subrubrd vel albidd subrubro maculatd, 

 septo albo .- long. I ^, lat. ^, alt. nV poll. 

 Hab. ad Sanctam Elenam. 



This approaches Crep. porcellana. The septum is somewhat distant 

 from the margin, and the apex, which is also somewhat distant from 

 it, is obtuse and obliquely turned towards the right side. 



From sandy mud, on shells, at a depth ranging from six to eight 

 fathoms.— W. J. B. 



Calyptr«a marginams. Cal. testd subovatd, sublavi vel vix cor- 

 rugatd, subfldvd vel albidd fusco strigatd ; intus nigricante vel 

 Jiavd fusco strigatd, septo albo: long. 1^, lat. 4^, alt. -r\ poll. 

 Hab. ad Panamam et ad Insulam Muerte. 



This species was found on stones and sliells, 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 al- 

 most lost in the margin, and is (directed towards the right side. — 

 W. J. B. * 



Calyptr^a squama. Cal. testd suborbiculari, complanatd, sublavi, 

 subtenui, pallidejlavd vel albidd fusco substrigatd; intus subjlavd 

 vel subjlavd fusco strigatd: long. 1, lat. -}-|-, alt. -tt^ poll. 



Hab. ad Panamam. 



The apex of this very flat species is lost in the margin. Found under 

 stones. — W. J. B. 



