16 



Differs from C. equestris, lithedaphus, and other similar spe- 

 cies, in having rather distant, regularly-disposed raised lines, 

 with intervening smaller ones, instead of their being all of uni- 

 form size. 



Calyptr^a chlorina. Testa irregularis, tenuis, concentrice 

 undosa, lineis clevatis aeutis confertis radiata, ad basim subcir- 

 cularis, oblique pyramidata, epidermide tenui chlorico induta ; 

 apice elevata, posteriori, spirali, cernuo : intus nitida, porcellana ; 

 margine evoluto, acuto ; lamina interiori semi-cyathiformi, brevi, 

 refiexo, oblique truncate Long. .}, lat. T G -, alt. -} poll. Hab. 

 Port Praya, Cape de Verds. 



Allied to C. equestris. Its depressed, orbicular and compara- 

 tively regular form, its short cup, and its color, are its character- 

 istics. 



Hipponix imbricata. Testa solida, oblique elevato-conica, 

 rubescens, costulis aeutis radiantibus 40-50, et lamcllis concen- 

 tricis concinne imbricato-clathrata ; apice submediano : apertura 

 rotundato-ovata : intus coccinea. Long. -£4, lat. ?>£, alt. 7 8 2 poll. 

 Hab. Sandwich Islands. 



Most like H. pilosa in sculpture, though the pattern is much 

 coarser. The apex is far more central and elevated. The color 

 of the interior is like II. foliacea, but more intense. 



Pileopsis crystallina. Testa parva, Candida, crystallina, 

 nitidissima, semiglobosa, ad basim ovata, sulcis profundis creber- 

 rimis radiantibus aeutis insculpta ; apice terminali, acuto, vix 

 curvato, submarginali : subtus ad marginem anticc acuminata, 

 postice septiformis. Long. £, lat. f , alt. £■ poll. Hab. Feejee 

 Islands. 



The beautiful crystalline, quartz-like lustre of this shell, its 

 deep, regular sulci, and its crepiduloid base very distinctly mark 

 this species. 



Helix labiosa. Testa depresso-conica, subtus convexa, arete 

 umbilicata, lutco-cornea, pilis scriceis quincuncialiter dispositis 

 undique villosa : spira anfr. 6 convexis, ultimo immodicc cres- 

 ccnte et pone labrum valde contracto : apertura angusta, lunata ; 

 labro albo, late revoluto ; faucc livida. Lat. -/y, alt. -£% poll. 

 Hab. Astoria, Oregon. 



Closely allied to II. palliata, but is smaller, lacks the tooth on 



