92 MOLLUSCA FROM THE CRAG. 



that must for the present remain separated, as they cannot be connected by any- 

 thing I possess. This shell presents the same differences to S.fimbriata and 8. fim- 

 briosa that S. frondicula does to S. subulata, the costae being produced and acuminated 

 at the upper part of the volution, but it has also larger, broader, smoother, and 

 more numerously reflected costae ; they are unlike those of S. fmbriata, and S.jim- 

 briosa, which bear the curved impress of the spiral striae or ridges, and in my 

 single specimen the costae are more oblique. In S. ftmbriosa a continued line of 

 rib passes from the apex to the outer edge of the last volution ; whereas in this 

 species the line of rib is lost outside the penultimate whorl, although it is a shorter 

 specimen. The ribs in the last volution amount to seventeen, with seven trans- 

 verse striae or ridges ; the lower one around the base is larger than the others, but 

 it scarcely deserves the name of a keel. 



5. Scalaeia frondosa. J. Sow. Tab. VIII, fig. 15. 



Scalaria frondosa. J. Sow. Min. Conch, t. 5/7, fig. 1, 1827. 

 — S. Wood. Catalogue 1842. 



Sc. Testa elongato-conicd, laevigata, imperforatd ; anfractibus rotundatis, disjunctis 

 costatis ; costis tenuibus ; superne angulatis, acutis ; aperturd rotundatd, marginatd. 



Shell elongato-conical, smooth, imperforate ; whorls round or cylindrical, dis- 

 joined ; costae thin, angulated, pointed, and projecting at the upper part ; aperture 

 circular ; left lip recurved, subcanaliculated. 



Axis, ■§- of an inch. 



Locality. Cor. Crag, Sutton. 



My cabinet contains but four specimens of this shell, which appears to be dis- 

 tinct. It approaches nearest to S. foliacea, particularly where the foliations are 

 broken off; but I have never seen the elevated spine-like processes at the upper 

 part of the lamellae upon any of my numerous specimens of that species. It has 

 about 8—9 volutions, with 9 — 10 lamellae upon the last. The figure represents 

 rather too many ribs upon one volution. 



6. Scalaria frondicula. S. Wood. Tab. VIII, fig. 16. 



Scalaria frondicula. $. Wood. Catalogue 1842. 



— frondosa. Nysi. Coq. foss. de Belg. p. 393, pi. 38, fig. 7, 1844. 



— tenera (?). J. Smith. Quart. Journ. Geol. Soc. 1847, p. 421, fig. 24. 



Sc. Testa elongatd, turritd ; spird subulata ; apice acuto ; anfractibus rotundatis, 

 contiguis costellatis ; costellis lamettosis, superne angulatis t spiniferis ; interstitiis Itsvigatis ; 

 aperturd rotundatd. 



Shell turreted and elongate ; spire tapering ; apex acute ; whorls round, con- 

 tiguous, with lamellated costae, angulated, or rather spinous, at the upper part ; 

 whorls without striae, and glossy ; aperture circular. 



Axis, \ of an inch. 



Locality. Cor. Crag, Sutton and Gedgrave. 



