SCALARIA. 



MOLLUSCA. 



83 



Shell turreted ; with seven or eight well defined, disunited 

 volutions, covered with somewhat distant, slender edged, broad 

 based, slightly curved and oblique, longitudinal, reflected ribs, 

 a little bent back in the centre ; aperture nearly round, and 

 destitute of a cord round the base, and also of a subumbilicus. 



This species is closely allied to tlie S. clathrus, but a little attention 

 to the above specific character will shew the difTerence. 



Found in the Suffolk Crag at Woodhall. 



3. S. RETICULATA The Rcticulatcd Scalaria, pi. XLII. 



fig. 3, 4. 



Scalaria reticulata. Sowerby, Min. Conch. VI. p. 150, pi. 

 577, fig. 5. Turbo reticulatus, Brander, fig. 27. 



Shell subulate, short ; with eight well defined, inflated, acute 

 volutions, covered with numerous, close, longitudinal ribs, and 

 crossed by nine or ten prominent spiral striae, producing a reti- 

 culated aspect ; columella hollow ; base smooth. 



Found in the London Clay at Barton Cliff. 



4. S. SIMILIS. — The Similar Scalaria, pi. XLII. fig. 5, 6. 

 Scalaria similis. Sowerby, Min. Conch. I. p. 49, pi. 16, two 



upper figs. Fleming, Brit. An. p. 311. 



Shell with eight or nine well defined volutions ; provided 

 with remote, rounded, circular, and prominent longitudinal 

 ribs ; a series of five or six spiral, slightly elevated ribs traverse 

 the shell from the base to the apex, but are interrupted by 

 each of the ribs ; the lower one on each volution the most 

 prominent ; aperture slightly ovate ; lips broad ; and nearly of 

 uniform thickness all round. 



This is a Crag fossil, and is found at Bramerlon, near Nor- 

 wich, and at Holywells, near Ipswich. 



5. S. iNTERRUPTA. — The Interrupled Scalaria, pi. XLII. 

 fig. 7, 8. 



Scalaria interriqjta. Sowerby, Min. Conch. VI. p. 149, pi. 

 577, fig. 3. 



Shell subulate; volutions united and convex; with numerous 

 longitudinal, obtuse ribs, slightly elevated at both extremities, 

 and united at both ends by transverse ridges, and a large varix 

 upon each volution: the whole shell spirally striate between 

 the ribs ; aperture circular, and its base projecting beyond the 

 lower portion of the body. 



A striking character of this shell is the union of all the ribs by a 

 thread-lilie, spiral rib. 



Found in the London Clay at Barton Cliff. 



6. S. SUBULATA The Subulate Scalaria, pi. XLII. fig. 9, 



10. 



Scalaria suhulata. Sowerby, Min. Conch. IV. p. 125, pi. 

 390, fig. 1. Fleming, Brit. An. p. 312. 



Shell subulate, turreted ; with eight slightly defined, con- 

 tiguous volutions ; covered by ten or twelve thick, well raised, 

 longitudinal ribs, which are reflected, and broadest at their 

 upper ends; aperture nearly circular; destitute of a cord around 

 the base, and without an umbilicus. 



Found in the Suffolk Crag. 



7. S. ACUTA — The Acute Scalaria, pi. XLII. fig. 11, 12. 

 Scalaria acuta. Sowerby, Min. Conch. I. p. 50, pi. 16, two 



lower figs. Fleming, Brit. An. p. 312. 



Shell turreted ; with eight or nine very gradually tapering, 

 deeply defined, and somewhat distant volutions; with numer- 

 ous, longitudinal, expanded, recurved ribs, acutely angular on 



their upper ends, uniting the volutions to each other, and form- 

 ing a flattened space above; three spiral, depressed ribs extend 

 from the base to the apex, between the longitudinal ribs, and a 

 fourth more prominent one near the lower margin of each volu- 

 tion ; aperture circular, with its margin reflected, and contracted 

 into a spine-formed process at its upper and outer extremity, 

 and shghtly peaked below the columellar side. 

 Found in the London Clay at Barton Cliff. 



8. S. UNDOSA The Waved Scalaria, pi. XLII. fig. 13. 



Scalaria undosa. Sowerby, Min. Conch. VI. p. 150, pi. 



577, fig. 4. 



Shell subulate; volutions united, convex; with about twenty- 

 four slightly elevated, waved, broad, longitudinal ribs, and fine 

 numerous, spiral stria; crossing them, and terminating in a 

 transverse band ; base almost smooth, with nearly obsolete lines 

 emanating from the ribs. 



Found in the London Clay at Barton Cliff. 



9. S. MiNUTA The Minute Scalaria, pi. XLII. fig. 14, 15. 



Scalaria minuta. Sowerby, Min. Conch. IV. p. 125, pi. 



390, fig. 3, 4. Fleming, Brit. An. p. 312. 



Shell turreted; with seven or eight contiguous, smooth volu- 

 tions ; each furnished with about twenty obtuse, thin, slightly 

 elevated, nearly straight, longitudinal ribs ; aperture slightly 

 ovate, furnished with a narrow lip all round, and is destitute of 

 an umbilicus. 



This shell is only about half an inch in length. Fig. 14 is a magnified 

 figure. It strongly resembles the recent species, S. Clathratulus, but the 

 ribs in that shell are more numerous and sharp. - 



Found in the Crag at Ramshot. 



10. S. SEMicosTATA. — The Semi-ribbed Scalaria, pi. XLII. 

 fig. 16, 17. 



Scalaria semicostata. Sowerby, Min. Conch. I. p. 50, pi. 

 16, middle fig. Fleming, Brit. An. p. 312. 



Shell with about seven contiguous, inflated volutions; with 

 numerous, shghtly elevated, longitudinal ribs, extending only 

 about half way down each volution, the lower portion being 

 quite smooth, all the upper portion spirally striated ; aperture 

 circular. Length about half an inch. 



Found in the London Clay at Barton Cliff. 



11. S. MUTICA The Barbless Scalaria, pi. XLII. fig. 19. 



Scalaria acuta, var. inutica. Sowerby, Min. Conch. VI. p. 



149, pi. 577, fig. 2. 



Shell subturreted ; with seven inflated volutions, and about 

 sixteen longitudinal, thick, sharp edged, reflected, unequal ribs 

 on each volution, but not produced above ; about four flat and 

 narrow spiral ribs intervene betwixt the longitudinal ones, but 

 do not cross them ; aperture circular ; margin thin. 



Found in the London Clay in Alum Bay, Isle of Wight. 



12. S. PLICATA The Plaited Scalaria, pi. XLII. fig. 18. 



Scalaria ^iHcata. Deshayes, Foss. Env. des Paris, pi. , 



fig. . Scalaria semicostata, Sowerby, Min. Conch. VI. p. 



150, pi. 577, fig. 6. 



Shell greatly elongated; with eleven or twelve attached, 

 moderately inflated volutions, ending in an acute apex ; with 

 numerous, nearly straight, longitudinal, blunted ribs, the inter- 

 stices crossed by fine spiral striae ; base of the body smooth ; 

 aperture slightly ovate; lips smooth and rounded, in their 

 whole circumference. 



Found in the London Clay at Barton Cliff. 



