25a 



MOLLUSCA. 



Fusus. 



consisting of tbree well defined and rapidly diminishing volu- 

 tions. Length three-eighths of an inch, diameter three-six- 

 teenths of an inch. 



In the Coal Shale, High-Green "Wood, near Todmorden. 



5. BucciNUM Naticoideum. — The Natica-like Buccinum, pi. 

 XXXIII.* fig. 1. 



B. Naticoide. Sowerby, Geo. Tr. 2nd Ser. IV. p. 347, pi. 

 23, fig. 4. 



Ovate, smooth, and thick ; spire produced, consisting of 

 four or five volutions, with their upper edges rounded , body 

 very large and ventricose ; aperture two-thirds the length of 

 the shell. 



The Portland Stone, Whitchurch, Swindon, Brill, and Vale 

 of Wardour. 



6. Buccinum angulatum. — The Angulated Buccinum, pi. 

 XXXIII.* fig. 74.* 



B. angulatum. Sowerby, Geo. Tr. 2nd. Ser. IV. p. 347, 

 pi. 23, fig. 5. 



Somewhat fusiform, short; spire with obliquely straight 

 sides ; body with a transverse central keel ; aperture rhomboidal, 

 with a short rounded beak. 



The Portland Stone, Swindon and Quaniton. 



7. BuccixuM STRIATUM. — The Striated Buccinum, plate 

 XXXIII.* fig. 74. 



B. striatum. Brown, Wernerian Mem. VIII. pi. 1, fig. 9. 

 Sowerby, Kec. of Gen. Sec. I. p. 134. 



" Volutions longitudinally undulated, transversely striated, 

 and but slightly convex ; the longitudinal ribs rather straight. 



" If the Buccinum undatum. be examined with a microscope, 

 it will be found that the transverse ridges are elevated, broad, 

 and distant, and there is between each of these ridges, in the 

 upper whorls, a narrow and less elevated ridge, and in the 

 lower or newer part of the shell generally about three. Now, 

 in B. striatum, the ridges are so fiat, that the shell may more 

 properly be said to be spirally striated than covered with 

 transverse ridges. The whorls in the new shell are also much 

 fllatter than in B. undatum, and the longitudinal undulations, 

 which in that shell are considerably concave towards the mouth 

 of the shell, are here almost quite straight." — G. Sowerby. 



N. costellata. Sowerby, Geo. Tr. 2nd. Ser. IV. p. 344, pi. 

 18, fig. 20. 



Subulate ; spire longer than the body ; with about seven 

 ventricose volutions, each provided with a varix ; whole covered 

 with longitudinal ribs and transverse striee; aperture nearly 

 circular, with a thickened lip. 



The Greensand, Blackdowa. 



1. Pyeula Fittoni.— Fitton's Pyrula, pi. XXXIII.* figs. 

 32, 33. 



P. Smithii. Sowerby, Geo. Tr. 2nd Series, IV. p. 336, pi. 

 11, fig. 15. 



Oval short ; body large ; spire small, consisting of two 

 or three volutions, with two spiral keels in the young state, 

 which become obsolete in the adult ; numeix)us fiue transverse 

 striae cover its surface, and obscure longitudinal ribs ; aperture 

 expanded. 



The Gualt, Cape Point, near Folkstone. 



2. Pyrula DEPREssA. — The Depressed Pyrula, pi. XXXIII.* 

 fig. 43. 



P. depressa. Sowerby, Geo. Tr. 2nd Series, IV. p. 344, pi. 

 18, fig. 20. 



Pyriform ; spire depressed, completely sunk beneath the top 

 of the body volution ; body ventricose ; base much narrowed ; 

 surface with many transverse narrow ribs, which project beyond 

 the margin of the outer lip. 



The Greensand, Blackdown. 



3. Pyrui^ Brightii. — Bright's Pyrula, pi. XXXIII.* figs. 

 44, 45. 



P. Brightii. Sowerby, Geo. Tr. 2nd Series, IV. p. 344, pi. 

 18, fig. 21. 



Pyriform, ventricose ; spire about a third the length of the 

 shell, consisting of about four volutions, the upper one small 

 and acute ; transversely bicarinated, and with many narrow 

 spiral ribs ; aperture wide, longitudinally, semi-circular, narrow 

 both above and below. 



The Greensand, Blackdown. 



1. Nassa lineata. — The Lineated Nassa, pi. XXXVII.* 

 fig. 27. 



N. lineata. Sowerby, Geo. Tr. 2nd Ser. IV. p. 344, pi. 18, 

 fig. 25. 



Ovate, body considerably longer than the spire, and inflated; 

 wide at the base, and the whole surface transversely striated ; 

 volutions a little flattened, the upper edges sharp ; aperture 

 somewhat longer than the spire. 



The Greensand, Blackdown. 



2. Nassa costellata.— The Small-Ribbed Nassa, plate 

 XXXVII* fi<T. 28. 



1. Fusus multicostatus. — The Many-ribbed Fusus, pi. 

 XXXVII.* fig. 3, 4. 



Fusiform ; spire occupying about a third of the shell, con- 

 sisting of three or four rather broad volutions, which, as well as 

 the body, are obUquely flattened above and straight on the 

 sides; defined above and below with a smooth regular rib; body 

 with from ten to fourteen smooth ribs ; the outer castal spools 

 being striated spirally and longitudinally ; aperture wide above 

 and narowed beneath ; pillar-lip a little reflected. 



Found in Dudley Limestone, at Dudley, Staffordshire, 



