15 



I am acquainted with no other species where the apex is so 

 elevated and so remote from the margin of the shell. It looks 

 like a very obtuse-angled bird's-beak. The specimen examined 

 had numerous rib-like folds on the surface, which were probably- 

 caused by its adhesion to some ribbed shell. 



Crepidula lingulata. Testa parva, depressa, obliqua, rotun- 

 data, alba, lineis numerosis crebre divaricantibus radiata, epider- 

 mide pallido induta ; apice acuto, libero, prope marginem sito : 

 intus lutescens ; septo linguiformi, exeavato, ad medium carina 

 diviso et oblique protruso, ad latus sinistrum profunde sinuato. 

 Diam. £, alt. f poll. Hab. Puget Sound. 



Like C. capensis, Quoy. The only specimen examined seems 

 to have been convex and solid in its early growth, afterwards 

 becoming flat. 



Crepidula ndmmaria. Testa tenuis, plana, circularis, alba, 

 striis incrementalibus laxis insculpta, epidermide flavo-cornea 

 induta ; apice vix conspicuo, marginali : septum internum latius 

 quam longum, deorsum fornicatum ; margine flexuoso : cavitas 

 fere nulla. Diam. f poll. Hab. Classet. 



This very peculiar shell is well characterized by its perfectly 

 flat, circular form. It probably grew within some other shell, 

 and other specimens may be found moulded into a different form. 

 It is separated from C. lingulata by the form of its septum. 



Calyptr^a fastigiata. Testa parva, tenuis, lsevis, rotun- 

 data, elevato-conica, concentrice et tenuissime striata, epider- 

 mide fusescente induta ; spira anfract. 3 planulatis, apice sub- 

 mediano, acuto : lamella interna spiralis, striata margine libero ad 

 centrum duplicato, haud appresso, umbilicum parvum effbrmante. 

 Diam. \ t alt. f poll. Hab. Puget Sound. 



In shape, size and interior, it scarcely differs from C. pileolus, 

 D'Orb., but that shell is white, has a rough surface, and is radi- 

 ately ribbed about the summit. It also resembles C. squa?na, 

 Brod. 



Calyptr.ea radiosa. Testa irregularis, tenuis, alba, lucida, 

 ad basim rotundata, oblique globoso-conica, lineis acutis numero- 

 sis elevatis cum striis tenuissimis intercalariis radiata ; apice 

 postico, obtuso : lamella interna elongata, semi-volutata, per- 

 oblique truncata ; cornubus lanceolatis ; basi attenuato. Diam. 

 $, alt. T 4 tf poll. Hab. Mangsi. 



