from the Gulf of California, etc. 385 
whorl two thirds the length of the shell; slightly Pun at peri- 
phery; suture delicate. Aperture ovate, rounde ase; lip 
slightly everted, with a constriction behind it; doa fold on the 
columella nearly transverse, elevated, serpenti and a small 
umbilical opening is seen running under 
Length one fourth of an inch; Ass one tenth of an inch. 
Inhabits Santa Barbara. Col. Jewett 
Has most of the characters of O. conoidea of Europe, but is per- 
haps proportionally broader. 
ODOSTOMIA ACHATES (Pl XIV. Fig. 13.) 
yu ovato-lanceolata, nitida, longitudinaliter striata, albida, maculis elongatis, 
rubiginosis obscure zonata; spira acuta, anfr. ad 9 vix convexis, ultimo 
diam longitudinis adequante, basi rotundata et strid unica submedianá& cinctá ; 
apertura angusta, ovata, tans acuta; columellà plicà medianá et duabus 
minoribus anterioribus instruct 
Shell ovate lanceolate, shining, with distinct and rather distant 
longitudinal strize ; ; color, whitish near the suture and mottled with 
pale rust color, arranged somewhat in bands of elongated spots ; spire 
acute, more rapidly tapering at tip; whorls eight or nine, scarcely 
convex, of which the last is half the length of the shell, entire and 
rounded at base, having a single impressed line around the middle, 
which runs up two or three whorls just behind the suture. Aper- 
ture narrow ovate, rounded in front, acute behind ; lip acute ; colu- 
mella with a very obvious fold at the middle, and two much smaller 
ones between it and the base. 
Length half an inch ; ee ase twentieths of an inch. 
Inhabits Mazatlan. Col. Jew 
At first sight this would be i for a land shell, like some of 
the slender and polished Achatinelle. Its generic place is some- 
what doubtful. It has not only the single fold of Monotigma and 
stomia, but at least two others like Pyramidella. It will some 
day be regarded as a distinct genus. 
FUSUS AMBUSTUS (PL XIV. Fig.18.) 
T. turres subequilateralis, dilut? rufa, fusco tincta; spira elongata, a Fen 
ad octo convexis, subangulatis, liris crebris cinctis, et ee come 
: = oo ornatis, prop? suturam constrictis ; apertura parva ; rostro 
Shell fusiform, its largest diameter near the middle ; color yel- 
JOURNAL B. S. N, H. 50 OCTOBER, 1859. 
