OF NEW TERTIARY FOSSILS. 115 



P. MississippiENsis. PI. 11, fig. 17. — Turreted; volutions eight, concave above and plain below, with 

 longitudinal distant rounded ribs ; body whorl with revolving lines, commencing in a line with the 

 summit of the aperture; beak short, a little curved. Length i. 



P. SERVATA. PI. 11, fig. 18. — Fusiform ; whorls ten, with rounded longitudinal ribs and prominent strong 

 revolving lines, a fine intermediate line on the body whorl ; volutions concave above, with a carinated 

 revolving line below the suture ; beak narrow, elongated, slightly bent, acuminate ; aperture and canal 

 rather more than half the length of the shell. Length 9-10. 



P. coNGESTA. PI. 11, fig. 19. — Short-fusiform, volutions nine or ten, with revolving raised lines and 

 longitudinal wrinkles; spire conical-acute; whorls slightly contracted in the middle, with longitudinal 

 curved irregular striae, interrupted in the middle of each whorl ; aperture half as long as the shell ; 

 beak slightly twisted. Length 1 1-lOth. Very abundant. 



It approaches the genus Brachijtoma, Swainson. 



P. CRisTATA. PI. 11. fig. 20.— Fusiform, whorls ten, angulated in the middle, except the two from the 

 apex, and with a reflected finely dentate carina ; revolving lines distinct, finely crenulated ; spire 

 scalariform ; from the upper end of the aperture runs a prominent revolving line, much larger than 

 the others ; lines on the body whorl below the angle minutely granulated ; beak narrow, produced. 

 Length |. Rare. 



P. TANTULA. PI. 11. fig. 21. — Slender; volutions nine, convex, with longitudinal rounded, slightly curved 

 ribs; spire elevated and acute ; suture margined by an indistinct raised line; beak short, narrow. 

 Length 4-10. Rare. 



A member of subgenus Clavatnla, Lara. 



P. TENELLA. PI. 1 1, fig. 22. — Fusiform ; volutions nine, whorls slightly contracted above, with longitudinal 

 prominent curved lines, and a prominent revolving line near and below the suture ; between this and 

 the suture an impressed line ; body whorl with strong prominent revolving lines, commencing in a line 

 with the upper end of the aperture, and sometimes alternated in size ; ribs frequently obsolete on the 

 body whorl, and terminating at the striated space ; beak narrow, somewhat produced. Length 8-10. 



It probably belongs to Swainson's genus, Clavicantha. 



P. cocHLEARis. PI. 11, fig. 23. — Subfusiform, with elevated revolving lines, alternated with fine lines, the 

 interstices with fine longitudinal wrinkled lines ; spire elevated, acute ; beak narrow, straight. Length 

 If. Very rare. 



The specimen figured is more than twice the size of any other specimen found, 

 though it is an abundant species. 



P. EBORoiDES. PI. 11, fig. 24'. — Turreted; whorls nine, smooth, flattened above, obscurely nodulous or 

 subcostate below ; beak short. Length 6-10. 



P. ABUNDANs. PI. 11, fig. 23. — Turreted ; whorls ten, concave above, with a crenulated prominent 

 revolving line just below the suture; convex portion of the whorls with prominent, acute, nearly 

 straight ribs and regular revolving lines ; concave portion with minute revolving lines ; beak narrow, 

 slightly produced. Length %. 



It belongs to subgenus Clavatnla, Lam. 



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