OF NEW TERTIARY FOSSILS. 119 



CASSIS. 



C. CiELATURA. PI. 11, fig. a. — Short-elliptical, with revolving lines and series of nodes and granules ; 

 tubercles profound on the angle of the body whorl ; spire prominent, whorls cancellated ; the upper 

 half with a profound revolving line ; labium granulated and striated throughout, the upper grains 

 indistinct; labrum with transverse prominent lines. Length I4. 



C. MisississippiENSis. PI. 11, fig. 45. — Subovate; whorls slightly concave above, the angle nodular; body 

 whorl indistinctly ribbed or waved ; revolving lines distinct but fine ; bod)' whorl with one sharp 

 compressed varix or carina; apex papillated; pillar with transverse rugose plaits throughout; 

 submargin of labrum regularly and profoundly dentate. Length 9-10. Very rare. 



ONISCIA. 



O. HARPULA. PI. 12, fig. 6. — Obovate, latticed ; longitudinal ribs angular, distant, about ten on the large 

 whorl, with a slightly foliated and waved margin ; revolving lines large, distant, about twelve on the 

 body whorl ; spire scalariform, the ribs divided by an impressed line ; submargin of labrum obtusely 

 dentate. Length 1 2-10. Very rare. 



FULGORARIA. 



F. MississiPPiENSis. PI. 13, fig. 1. — Elliptical, volutions nine, fluted, the ridges distant, acute, and generally 

 one or two of them large, thick and very remote from each other, on the body whorl; spire conical, 

 acute ; aperture auriform ; columella with nearly equal plaits, not oblique ; labium thick, with a sharp 

 margin. Length li. Common. 



OLIVA. 



O. MISSISSIPPIENSIS. PI. 13, fig. 6, 38. — Subelliptical ; volutions six and a half; on the middle of the body 

 whorl is a slightly impressed revolving line. Length 1 1-10. Usual size I. Abundant. 



MITRA. 



M. coNQUisiTA. PI. 12, fig. 1. — Fusiform, slender, smooth and polished; whorls eleven, slightly convex; 

 penultimate whorl entire, except at the summit, where there are two impressed lines forming a raised 

 line between them ; the other whorls of the spire with revolving lines, and towards the apex the 

 intervening spaces transversely wrinkled ; apex acute ; body whorl above the aperture, except the 

 lines near the suture, without strife ; inferiorly striated ; aperture narrow ; labium 3-plaited. Length 

 1 4-10. Very rare. 



M. MISSISSIPPIENSIS. PI. 12, fig. 2. — Narrow-fusiform, with eight whorls, flattened at the sides and slightly 

 scalariform ; whole surface with revolving unequal lines and longitudinal fine wrinkles, obsolete on 

 the lines but distinct on the intervening spaces ; aperture more than half the length of the shell ; 

 columella 3-plaited. Length If. Rare. 



In the young shell the strijE are prominent over the whole surface, but in adult 

 specimens they become slightly impre.ssed lines on the ventricose portion of the body. 



M. CELLULiFERA. PI. 12, fig. 3. — Elevated-subfusiform ; slender; whorls slightly turreted; longitudinally 

 ribbed ; interstices with transverse impressed lines, resembling punctce or cells ; beak produced ; 

 labium 4<-plaited, the second one from the top divided by a slightly impressed line. Length f . Rare. 



31 



