GASTEROPODA. 207 
ERBY ; Genera of Shells, fig. 4. Guerin; Magasin de Zool., pl. 40. 
KriENER; Iconog., pl. vi. f. 17. 
The shell in question is marked as occurring at Puget Sound. I at 
first regarded it as new, and described it under the name of S. boreals ; 
but, upon close examination, I can see no other difference between the 
northern and southern shell, than the number of ribs, which are eight 
in the northern and ten in the southern shell. It would be very 
strange to find species identical at points so remote from each other on 
opposite sides of the equator while we might expect to find them ana- 
logous; and I cannot but think, that there is either an error in the 
locality, or that better specimens would show decided differences. 
STILIFER ACICULA (Gould). 
Testa minuta, tmperforata, elongato-subulata, acutissima, ad apicem 
integerrima et lente distorta, nitidissima, livido-lactea interdum 
flavescens: spira anfractibus ad duodecim planulatis ; sutura lucida: 
apertura angusta, ovalis; labro simplici, antrorsum arcuato, antice 
evoluto ; columella viz arcuata. 
Stilifer acicula, Goutp; Proceed. Boston Soc, Nat. Hist., ili. 84. 
March 1849. Expedition Shells, 54. 
SHELL minute, highly polished, thin, vitreous and transparent, 
elongated, subulate, at tip very acute and slightly distorted, of a tar- 
nished, bluish-white colour, mixed with pale yellow. Whorls nume- 
rous, twelve or more, conical or scarcely swelling, opaque, white at the 
suture, which is well marked, and generally has an accompanying 
stria. Aperture small, ovate, more than half the length of the last 
whorl : lip simple, when viewed laterally exhibiting its outline arching 
forwards, so as to form somewhat of a sinus at the upper angle; 
column short, slightly arcuate, continued into the lip, which is some- 
what everted or effuse at base. 
Length three-eighths of an inch; breadth one-tenth of an inch. 
Inhabits the skin of Holothuria, Feejee Islands, Drayton. 
A much more delicate species than any one of S¢zlifer or Eulima 
