39 



Calyptr^a STRiGATA. Ccil. testct suhcorrugutd, sonlide ruhrd alio 

 varid ; intus suhrufd interdum alhd vel nlbd rnbro-custaneo varid : 

 diam. 1 poll, 



Hab. ad Valparaiso. 



This varies mucli both in colour and shape. Some of the specimens 

 are quite flat, and the lamina almost convex. An obscure subar- 

 cuate 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 Cat. 

 dilatato. 



Found on Mytili at depths varying from three to six fathoms. — 

 W. J. B. 



Calyptr^a Echinus. Cat. testd albidd violaceo maculatd, inter- 

 dum fusca, striis longitudinaiibus creberrimis spinis fornicatis hor- 

 ridd ; inihs Jlavente vel alba : diam. l-J-, lat. \^, alt. \ poll. 

 Hnb. ad Peruviam. (Lobos Island.) 



In old specimens the spines are almost entirely worn down, and 

 rough stri(F only, for the most part, remain. In this state it bears 

 a great resemblance to the figure given of Crepidula fornicata in 

 Sowerby's Genera of Shells, No. 23, f . 1 . 

 Found under stones at low water. — VV. J. B. 



Calyptr^a Hystuix. Col. .lordide albd vel fused, complanatd, 

 longiludinaliter striatd, spinis magnis fornicatis apertis seriatim 

 dispositis ; intus albidd, interdum castuneo maculatd: diam. Jj-, 

 lat. I, alt. 1 poll. 

 Hab. ad Peruviam. (Lobos Island.) 



Approaching the last, but difl'ering in being always more flatiened, 

 in the comparatively great size of the vaulted spines, and in the com- 

 paratively wide interval between them ; still I would not be ])ositive 

 that they are not all varieties of Crepidula aculeata. Lam. — W. J. B. 



Calyptr^a pallida. Cal. testd sordid^ albd, ovatd ; apice promi- 



nente : diam. I, lat. ^, alt. i poll. 

 Hab. ad Insulas Falkland dictas. 

 Found under stones. — W. J. B. 



Subgenus Crepidula, Less. 

 Lamina subrecta, apice postico et submedio. 



Crkpidula unguiformis. Lam., varietas complanato-recurva : 

 long. 1 1, lat. I- poll. 



Hab. ad Insulam Chiloen et ad Panamam. 



This variety affords a good example of the powers of adaptation of 

 the animal. The shell is either flattened or concave on the back, and 

 recurved in consequence of its adhesion to the inside of dead shells 

 of Ranella Fexillum, calata, &c. 



It was dredged from sandy mud, at a depth ranging from four to 

 ten fathoms. — W. J. B. 



Calyptr^a Lkssonii. Cal. testd complanatd, subconcentrice folia- 

 cedffoliis tenuibus, albdfusco Ion gitudina liter strigatd ; intus al- 

 bidd ; limbo inlerno interdum fusco cilia to-strigato : long. l-^V, lat. 

 -14-, alt. ipoll. 



