Natica. 



MOLLUSCA. 



255 



S. pulchra. Sowerby, Geo. Tr. '2nd Ser. IV. p. 313, pi. 18, 

 fig. 11. 



Elongated, with ten close volutions, crossed by blunt lon<n- 

 tudinal ribs; a baud connecting the ribs, passes along the 

 bases of the volutions ; spire acute, aperture sub-ovate. 



The Greensand, Blackdovra. 



1. CiRRtJS Gloveri. — Glover's Cirrus, pi. XXI.* f. 46, 47. 



C. Gloveri. Brown, Tr. Man. Geo. Soc. I. p. 223, pi. 7, 

 figs. 46, 47. 



Shell conoidal, smooth, glossy ; body very large, much 

 inflated ; spire very small, consisting of three rapidly diminish- 

 ing, ventricose volutions ; aperture round ; inner lip slightly 

 reflected on the columella, with a shallow umbilicus behind it ; 

 outer lip thin, and even. Length three-eighths of an inch, 

 diameter three-sixteenths of an inch. 



Found at High-Green Wood, near Hebden Bridge. In the 

 Manchester Museum. 



Named in honour of my much respected friend, Thomas 

 Glover, Esq., of Smedley Hill, Manchester. 



four volutions, ending in an obtuse apex ; a narrow prominent 

 band, formed by the filling up of the marginal sinus ; surface 

 with five transverse keels, or ribs, the intercostal spaces nu- 

 merously striated; aperture oblong-ovate, a little narrowed 

 above. 



The Lower Ludlow Rocks, Shelderton Hills, near Aymestry, 

 and Dean's Corner. 



3. Pi.EUROTOMARiA ANQULATA. — The Angled Pleurotomaria, 

 pi. XXXIII.* fig. 84. 



P. angulata. Sowerby, Sil. Syst. p. 641, pi. 21, fig. 20. 



Conical, acutely angled in the middle of the volutions ; the 

 surface probably sti-iated ; aperture nearly circular, with an 

 angle at its upper part. A cast only. 



In the Lower Silurian Rocks, Mandiuam, Llandovery. 



4. Pleurotomaria gigantea. — The Gigantic Pleurotoma- 

 ria, pi. XXXVII.* fig. 29. 



P. gigantca. Sowerby, Geo. Tr. 2nd Ser. IV. p. 339, pi. 

 14, fig. 16. 



Conical, with straight sides, and the volutions over-lapping 

 each other ; lip with a deep sinus ; band transversely striated ; 

 whole surface concentrically striated; height and breadtli 

 nearly equal. 



The Lower Greensand, Boughton, Kent. 



1. Tornatella striata. — The Striated Tornatella, plate 

 XLIII. figs. 14, 15. 



Actaon striatus. Sowerby, IV. p. 37, pi. 460, fig. 2. 



Regularly ovate ; spire with four rather flat volutions, ter- 

 minating in rather an acute apex ; columella with an indistinct 

 plait ; whole surface covered by rather regular transverse strise, 

 which are nearly obsolete on the middle of the body, but strong 

 on the base ; aperture ovate, pointed above, and occupying 

 more than half the length of the shell. 



The Red and Coral Crags, Sutton. 



1. Pleorotomaria undata. — The Waved Pleurotomaria, 

 pi. XXXIIL* fig. 12. 



P. undata. Sowerby, Sil. Syst. p. 019, pi. 8, fig. 13. 



Ventricose, sub-conic, consisting of four inflated volutions ; 

 body large, spire small, with an obtuse apex ; base convex ; 

 surface with many longitudinal curved, oblique, slightly pro- 

 minent undulations ; lip with a deep sinus, forming a narrow, 

 hardly elevated, band around the volutions ; aperture orbicidar. 



The Lower Ludlow Rock, near Ludlow, Presteign, and 

 Dean's Comer. 



2. Pleurotomaria Llotdii. — Lloyd's Pleurotomaria, pi. 

 XXXIIL* fig. 85. 



P. Llogdii. Sowerby, Sil. Syst. p. 619, pi. 8, fig. 14. 

 Conical, sub-turreted ; body long, spire short, consisting of 



1. Veldtixa cndata. — The Waved Velutina, pi. XXXIIL* 

 fig. 80. 



F. undata. Brown, Wern. Mem. VIII. pi. 1. fig. 15. 



Nearly orbicular ; spire exceedingly small, placed latenilly 

 and sunk beneath the expansion of the outer lip ; apex de- 

 pressed ; the whole shell covered with strong longitudinal 

 wrinkles, following the lines of growth, and crossed by wide 

 obsolete, spiral strix ; aperture sub-orbicular, extremely large ; 

 pillar-lip broadly retlectod on the columella, distinctly relieved 

 from the body behind, and a semi-lunate broad groove in its 

 centre. 



In the Pleistocene Marine Formation, Dalmuir, Renfrew- 

 shire. 



1. Natica clausa.— The Close Natica, pi. XXXIII * f. 79. 

 A'', clausa. Brown, Wern. Mem. VIII. pi. 4, fig. 10. 

 Ovate, with five volutions, those of the spire, which is tery 



sliort, slightly produced ; somewhat depressed ; grooved above, 

 and well-defined by the suture ; aperture obliijue. semi-ovate, 

 a little flattened on its interior side ; pillar-lip broadly reflected 

 on the columella, behind wliich is a closed umbilicus ; surface 

 with very delicate longitudinally obUque striae. 

 In the Pleistocene Marine Formation, Dalmuir. 



2. Natica minima. — The Least Natica, pi. XXL- figs. 63, 

 64, 65. 



