GASTEROPODA. 375 
Length half an inch ; breadth three-eighths of an inch; height one- 
fifth of an inch. 
Inhabits Upolu, Samoa Islands. 
A very pretty species, somewhat resembling E. parmophordea, 
Quoy, but differs in the dark colouring along the inner margin of the 
muscular impression, forming the figure of a mushroom, and in the 
greater development of the notch. 
Figures 491, 491 a, 491 8, dorsal, interior, and profile views of the 
shell; 491 c, details of sculpture, enlarged. 
CREPIDULA ROSTRIFORMIS (Gould). 
Testa solida, levis, castanea, elevata, recurva, ad basim rotundato-ovalis ; 
apice postico, adunco : lamina interna angusta, alba, profunde sita, ver- 
sus apicem penetrans : margine arcuatim sinuato. 
Crepidula rostriformis, GouLD ; Proceed. Boston Soc. Nat. Hist., 1. 
160. August 1846. Expedition Shells, 14. 
Suet solid, nearly circular at base, elevated, and curved back- 
wards so as to resemble a short, thick beak, like that of a parrot. 
The apex is pointed, hooked, and projects beyond the posterior 
margin of the base. The surface is smooth, regular, and somewhat 
polished, of a pale chestnut-colour. The interior very pale chestnut, 
covered with a whitish bloom. The lamella is white, very short; its 
anterior edge deeply and regularly curved, thin at the middle, and 
thickened at the sides: along its lower face a cavity penetrates into 
the beak. 
Length three-fourths of an inch; breadth half an inch; height three- 
eighths of an inch. 
Inhabits the Straits of De Fuca, Oregon. 
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 ob- 
