92 MOLLUSCA FROM THE CRAG. 



but it has also larger, l)roader, smoother, and more numerously reflected costae ; they are 

 unlike those of S.fmbriata and S.fimbriosa, which bear the curved impress of the spiral 

 strife or ridges, and in my single specimen the costpe are more oblique. In S.fimbriosa 

 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 

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

 it scarcely deserves the name of a keel. 



5. SCALARIA. FRONDOSA. /. Son\ Tab. VIII, fig. 15. 



ScALARiA FRONDOSA. J. Sow. Min. Conch. t. ^n, fig. 1, 1827. 

 — S. Wood. Catalogue 1842. 



Sc. Testa elongato-conicd, lavigatd, imperforatd; anfractibiis rotimdatis, disjunetis 

 costatis; cosiis tenuibus ; siq)erne angulatis, acutis; apertiird rotundatd, marginatd. 



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

 costse thin, angulated, pointed, and projecting at the upper part ; aperture circular ; 

 left lip recurved, subcanaliculated. 



Axis, I of an inch. 



Locality. Cor. Crag, Sutton. 



My cabinet contains but four specimens of this shell, which appears to be distinct. 

 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. 8. Wood. Tab. VIII, fig. 16. 



ScALABiA FRONDICULA. 5. Wood. Catalogue 1842. 



— FRONDOSA. Nyst. Coq. foss. de Belg. p. 393, pi. 38, fig. 7, 1844. 



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



Sc. Testa elongutd, turritd ; spird subulatd ; apice acuto ; anfractibus rotundatis, 

 contiguis costellatis ; costellis lamellosis, superne angulatis, spiniferis ; interstitiis Icsvigatis ; 

 aperturd rotundatd. 



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

 with lamellated costse, angulated, or rather spinous, at the upper part ; whorls without 

 striae, and glossy ; aperture circular. 



Axis, I of an inch. 



Locality. Cor. Crag, Sutton and Gedgrave. 



I have considered this as distinct from the preceding, in consequence of the volu- 

 tions being contiguous ; the lamellae, also, are numerous, less prominent, and reflected, 

 and it is a more subulate shell. It appears to resemble S. clathratula, particularly in 

 the young state, but the costae are elevated into small spinous fronds, projecting 



