52 AMERICAN MARINE CONCHOLOGY. 
interstices darker, suture porcellanous, last whorl numerously 
fasciate. 
Length 10, diam. 4.5 mill. 
Oak Island, North Carolina. 
This species I have not seen, and it has not been figured. 
2. M. ritirormis, Holmes. Fig. 86. 
Post-Pliocene Foss. So. Car. 69, t. 11, f. 9. 1860. 
Shell fusiform, costate, transversely striate; costz smooth, 
somewhat angulated at the periphery of the middle whorls; the 
third whorl cancellate; apex smooth; base without ribs; strize 
transverse, numerous, slightly waved, filiform. ‘ 
South Carolina. 
In general outline this little shell resembles the young of Fusus 
cinereus, Say, but the smooth ribs, nodulous and angulated peri- 
phery of the middle whorls and beautiful filiform strie, readily 
distinguish it from that species. 
3. M. LABECULA, Gould. . 
Proc. Bost. Soc. Nat. Hist., viii. 281. 1862. 
Shell small, ovate fusiform, waxy, with chestnut markings 
within and without the lip, thinly spirally striate, with sixteen 
longitudinal plications which become evanescent on the body- 
whorl; whorls seven to eight with a subsutural impressed line ; 
aperture small, oval; lip gibbous, thickened without and granu- 
late within. Sinus scarcely perceptible. 
Length 7, diam. 3 mill. 
(Dredged.) Coast of Georgia. 
Family VOLUTID&. 
Shell turreted or convolute; aperture notched in front; colu- 
mella obliquely plaited. No operculum (typically). Animal with 
a recurved siphon; foot very large, partly hiding the shell; man- 
tle often lobed and reflected over the shell, eyes on the tentacles 
or near their base. 
Synopsis of Genera. 
Shell ventricose, thick ; spire short, apex mammillated; aperture large, 
outer lip not thickened, deeply notched in front; columella with several 
plaits. Vouura, Linneus. 
Shell fusiform, thick; spire elevated, acute; aperture small, notched in 
front ; columella obliquely plaited ; operculum very small. 
Mirra, Humphreys. 
