39 



Calyptr^ea strigata. Cal. lestd subcorrugatd, soriHde rubrd alio 

 varid ; intūs suhrufd interdum alhd vel albd rubro-castaneo varid: 

 diam. 1 poli, 



Hab. ad Valparaiso. 



This varies much both in colouv and shape. Some of the specimens 

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

 cuate longitudinal vvhitish broad streak may be traced on the backs 

 of most ot them. It is not impossible that it may be a variety of Cal. 

 dilatata. 



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

 W. J. B. 



Calyptk^a EcniNUS. Cal. testd albidd violaceo maculatd, inter- 

 dum fuscd, striis longitudinalibus creberrimis spinis fornicatis hor- 

 ridd; intūs Jiavente vel albd : diam. I4-, lat. 1-į-, alt. ^ poli. 

 Hab. ad Peruviam. (Lobos Island.) 



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

 rough stri(E only, for the most part, remain. In this statė it bears 

 a great resemblance to the figure given of Crepidula fornicata in 

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

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



Calyptr^ea Hystuix. Cal. sordide albd vel fuscd, coniplanatd, 

 longiludinaliter striatd, spinis magnis fornicatis apertis seriatim 

 dispositis ; intiis albidd, interdum castaneo maculatd: diatn. If, 

 lat. į, uit. į poli. 

 Hab. ad Peruviam. (Lobos Island.) 



Approaching the lašt, but diflering in being always more flatiened, 

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

 paratively wide inlerval betvveen them ; still I would r.ot be positive 

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



CalyptRjEa pallida. Cal. testd sordidi albd, ovatd; apice promi- 



nente : diam. I, lat. ^, alt. I poli. 

 Hab. ad Insulas F'alkland dietas. 

 Found under stones. — W. J. B. 



Subgenus Crepidula, Less. 

 Lamina subrecta, apice postico et submedio. 



Crepidula unguiformis, Lam.^ varietas complanato-recurva : 

 long. I-5-, lat. %■ poli. 



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 Vexillum, cotlata, &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 foUa- 

 ced,foUis tenuibus, albdfusco longitudinaliter strigatd ; inlus al- 

 bidd ; limbo interno interdum fusco ciliatcstrigato : long. 1-rV, lai. 

 -1 T) alt. -g- poli. 



