GASTEROPODA. 205 
~ 
the suture, which is usually margined. The aperture is three-fourths 
the length of the shell, very narrow, slightly widened in front; interior 
of the hp thickened, and bearing eight lamellar teeth, which extend 
far into the shell; the inner lip bears three, sometimes four teeth, of 
which one on the columella, continuous with the lip, is much the 
largest. 
Length three-tenths of an inch; breadth two-tenths of an inch. 
Inhabits Raraka Island, Paumotu Group. 
Remarkable for its colour and shape. It is unusually acute in 
front. It possibly may be the young of M. lutea. 
Figure 242, dorsal view of the shell, enlarged ; 242 a, ventral view 
of the shell, natural size ; 242 6, aperture, enlarged. 
SCALARIA GRACILENTA (Gould). 
Testa minuta, gracilis, elongato-turrita, alba, costis longitudinalibus 
tenuibus ad sexdecem clathrata, spiraliter inter costas striata, imper- 
forata: spira anfractibus novem cylindraceis, contiguis ; sutura pro- 
Sunda: apertura circularis, ab anfractu penultimo haud sejuncta ; 
labro continuo, refiexo, posticé et ad columelle basim dilatato. 
Scalaria gracilenta, Gourd; Proceed. Boston Soc. Nat. Hist., 11. 
252. December 1847. 
SHELL minute, turreted, very long and slender, white, barred with 
about sixteen delicate ribs, the spaces between which are crossed by 
spiral lines. ‘The spire is composed of nine cylindrical whorls, suffi- 
ciently united, deeply girt in at the suture. The aperture is circular, 
not detached from the preceding whorl; lip reflected, widened poste- 
riorly, and at the base of the columella. 
Length one-fourth of an inch; breadth one-sixteenth of an inch. 
Inhabits Mangsi Island, China Sea. 
One of the most slender and delicate species of the genus, resem- 
52 
