ROSTELLARIA. 



MOLLUSCA. 



55 



Shell turreted; spire costated, consisting of seven well 

 defined volutions terminating in an acute apex, lower volution 

 bicarinated; columella smooth; outer lip much developed and 

 spreading, and with a canal at its upper extremity, consisting of 

 one lobe only, and provided with a spine where the superior 

 carina terminates upon its margin. 



Found in the stratum above the Coal, at Brora, Scotland, 

 and in the Oxford Clay, at Weymouth, also at Scarborough. 



9. R. CALCARATA. — The Spur-shaped Rostellaria, pi. 

 XXXIII. fig. 5, 6. 



Rostellaria calcarata. Sowerby, Min. Conch. IV. p. 70, pi. 

 349, fig. 6, 7. Parkinson, Organic Remains, III. p. 63, pi. 5, 

 fig. 2. Fleming, Brit. An. p- 360. 



Shell turreted, with six or seven well defined volutions, 

 crossed by numerous longitudinal, somewhat elevated, linear, 

 curved ribs, and a few varicose sutures ; lower or body volution 

 carinated, having a principal and several smaller carinao; the 

 whole exterior surface covered with close striae; outer lip pro- 

 vided with a large, oblong, squarish, ascending process, in the 

 form of a curved spur or spine on its upper angle, which is pro- 

 duced by an elongation of the larger keel ; the superior canal of 

 the lip short and obtusely pointed; beak short and somewhat 

 acute; inner lip entire with its edges a little rounded. 



Found at Blackdown, in the Whetstone pits. 



10. R. TRIFIDA. — The Trifid Rostellaria, Phillips, Geo. 

 of Yorkshire, I. p. 109, pi. 5, fig. 14. 



Shell provided with several carinse, the outer lip hardly 

 expanded, and furnished with a long subspatulose, slightly 

 ascending process; beak arcuated. 



Found in the Oxford Clay at Scarborough, by Mr. Bean. 



11. R. ANGULATA. — The Angled Rostellaria. 



R. angulata. Phillips, Geo. of Yorkshire. II. p. 230, pi. 16, 



fig. 16. 



" Volutions angular, the upper ones tricarinate." 



Found in the Mountain Limestone at Bolland, Queen's 



County, Ireland. 



12. R. BETUSA.— The Blunted Rostellaria, pi. XXXIII.* 

 fig. 10. 



Rostellaria retusa. Sowerby, Geo. Trans. IV. p. 344, pi. 

 18, fig. 22. 



Shell short ovate ; body long, spire small, consisting of four 

 narrow, rounded volutions, each provided with one distinct, 

 elevated carina, and also an obsolete one ; whole shell with a 

 finely polished surface, and covered with close and fine spiral 

 striae; outer lip furnished with an elongated, narrow, slightly 

 ascending, spur-like process, projecting from the elevated carina. 



SECTION III OUTER LIP NOT EXPANDED. 



13. R. LUCiDA — The Shining Rostellaria, pi. XXXIII. fig. 

 20,21. ' ^ 



Rostellaria? lucida. Sowerby, Min. Conch. I. p. 203, pi. 

 91, fig. 1, 2, 3. Fleming, Brit. An. p. 359. 



Shell glossy, fusiform ; spire consisting of eight gradually 

 tapering volutions, and terminating in a somewhat acute apex ; 

 body volution nearly equal in length to the spire ; whole shell 

 covered with many obtusely rounded, longitudinal volutions, 

 and crossed by numerous, transverse, elevated, obtuse striae ; 

 mner lip smooth and broadly reflected on the columella; outer 

 lip thickened and provided with a very short channel at its 



upper extremity, with an obscure sinus at its lower extremity, 

 and terminating in a very short beak. 



We have not met with the immature shell, but Sowerby says that 

 its lip is not thickened ; and when the body volution is about half- 

 formed its growth appears to cease and then the margin of the lip 

 is inflected; and on its becoming perfect the outer lip is thickened, 

 when the inflected part of the former lip is visible about half a 

 convolution from the outer lip, in the form of a prominent rib. 



Found in the London Clay at Highgate Hill. 



14. R. RIMOSA.— The Cleft Rostellaria, pi. XXXIIL fig. 

 12, 13. 



Rostellaria rimosa. Sowerby, Min. Conch. I. p. 204, pi. 91, 

 fig. 4, 5, 6. Fleming, Brit. An. p. 360. Murex rimosus, 

 Brander, Fossil Hant. fig. 29. 



Shell fusiform and shining; body in front equal to about half 

 the shell; spire consisting of eight or nine slightly convex 

 volutions, which are but moderately defined by the suture, and 

 terminate in an acute apex; whole shell covered with numerous, 

 slightly rounded, longitudinal, sharp ribs, and transversely stri- 

 ated; columella strongly defined, and extending to the superior 

 margin of the fifth or sixth volution of the spire; aperture 

 obhquely ovate, contracted at both extremities, with a long un- 

 dulating and pretty deep canal, extending as far as the extremity 

 of the columella; outer lip reflected, and slightly flattened in 

 front, with a sinus towards its lower extremity; beak straight 

 and short. 



This species varies considerably from its young to its adult state ; 

 in the very young stage, the reflected and extended columella and 

 lip are not formed, although the lip in this condition is frequently 

 thickened ; and when more advanced, or about half its full size, 

 the Up extends over about two volutions, which when mature reaches 

 the fifth or sixth volution, terminating in a gentle curvature. 



Found plentifully in the London Clay at Barton Cliff. 



13. R. ELONGATA The Elongated Rostellaria. pi. 



XXXIII.* fig. 5. 



Rostellaria elongata. Sowerby, Geo. Trans. IV. 2nd series, 

 p. 336, pi. 11, fig. 16. 



Shell turreted, greatly elongated ; body and spire nearly of 

 equal length, the latter consisting of four or five volutions, 

 divided by a broad, hollow suture, crossed by a longitudinal 

 series of ribs, and transversely striated ; the upper edges of the 

 volutions smooth ; aperture subovate, pointed, both above and 

 below ; inner lip with a sub-uraabihcus. 



Found by Dr. Fitton, in the Gualt. 



16. R. MARGiNATA The Marginated Rostellaria, pi. 



XXXIII.* fig. 6, 7. 



Rostellaria marginata. Geo. Trans. IV. 2nd series, p. 336, 

 pi. U, fig. 18. 



Shell conical, turreted ; body and spire nearly equal, the 

 latter consisting of six or seven moderately inflated volutions, 

 divided by an elevated, linear suture, each volution provided 

 with eight or ten longitudinal, short, obtuse ribs, crossed by 

 numerous strise; the body destitute of ribs and furnished with 

 a nearly central, elevated carina; aperture slightly ovate. 



This species is nearly allied to Rostellaria Parkinsoni, but may at 

 once be distinguished by the spiral, elevated band which divides the 

 volutions. 



Found in the Gualt. 



17. R. BucciNoiDEs. — The Buccinum-shaped Rostellaria, 

 pi. XXXIII.* fig. 9. 



