40 



Hab. in sinu Giuiyaąuil. (Isle ot Muerte.) 



This beautiful species, which I havenamed in honourof M Lesson, 

 was found under stones at low water. It vvill remind the observer ot" 

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



Calyptr^a incurva. Cal. testd fusco nigricante, tortuosd, corrn- 

 gatd ; intus nigricante, sepio albo ; apice adunco: long. 1, lat. +, 

 alt. ^ poli. 



Hab. ad Sanctam Elenatn et ad Xipixapl. 



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

 from six to ten fatlioms, — W. J. B. 



Calyptb^a excavata. Cal. testd crassiusculd, subtortuosd, letvi, 

 albidd vel subjįavd fusco punctatd et strigntd ; intus albd vel albd 

 fusco fucatu, limbo interdum fusco ciliato-strigato : long. H, 

 lat. \į, alt. 4- poli. 

 Hab. ad Real Liejos. 



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

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

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

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



Calyptrjea arenata. Cal. testd subovatd, albidd rubro-fusco cre- 

 berrime punctatd ; intils subrubrd vel albidd subrubro maculatd, 

 septo albo : long. \ -y, lat. į, alt. -^Kf poli, 

 Hab. ad Sanctam Elenam. 



This approaches Crep. porcelianą. The septum is somevrhat distant 

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

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



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

 fathoms.— \V. J. B. 



Calyptr^ba marginalis. Cal. lestd subovatd, sublcevi vel vir cor- 

 rugatd, subfldvd vel albidd fusco slrigatd ; intus nigricante vel 

 Jlavd fusco slrigatd, septo albo: long. l^, lat. -Į4, alt. tV poli. 

 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 vvhite septum show.s 

 beautifuUy against the black-brovvn of the interior. The apex is al- 

 most lošt in the margin, and is directed tovvards the right side. — 

 W. J. B. 



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

 subtenui, pallide Jlavd vel albidd fusco substrigatd ; intiis subjiavd 

 vel subjiavd fusco slrigatd: long. \, lat. -^, alt. ^\ poli. 

 Hab. ad Panamam. 



The apex of this very flat species is lošt in the margin, Found under 

 stones. — W. J. B. 



