J. Starkie Gardner — Cretaceous Gasteropoda. 77 



Group 1. — Genus So al aria, Lamarck, 1801. 

 Synonym : Scala, Klein, 1753. 



Lamarck's name Scalaria is generally adopted, although that of 

 Klein has undoubted priority. The description of this genus is 

 taken from Adams's work before referred to, p. 220. 



" Shell usually pure white, solid, lustrous, turreted, many-whorled ; 

 whorls convex, sometimes separated, ornamented with numerous 

 longitudinal ribs ; aperture round, peristome continuous, thickened." 

 There are about 100 recent, species. 



This group is very poorly represented, and the species are of small 

 dimensions in the rocks under consideration. 



SoALAEiA QuEENii,^ J. S. G., Plate III.' Figs. 1, 2, 3. 

 Upper Greensand, Blackdown. 



Shell moderately elongated, angle 40° ; whorls nine, very inflated 

 and depressed; ribs thirteen, salient, well-defined, obtuse; strise few, 

 rounded but prominent. Aperture round, peristome thickened and 

 complete ; outer lip broad and reflected. This charming little species 

 is the only one which has come under my notice possessing a circu- 

 lar mouth and complete peristome, and therefore approaches more 

 nearly than any other to the recent ScalariiS. 



Two small and very perfect specimens are in the British Museum, 

 and the last whorl of a larger specimen is in Mr. Meyer's possession. 

 They are from the Upper Greensand of Blackdown. 



Scalaria Meyeri,^ J. S. G., Plate IIL Fig. 4. 

 Neocomian. 



Shell elongated ; whorls inflated, depressed ; ribs about ten, thick, 

 prominent and obtuse, continued to umbilicus ; strias few, of differing 

 strength, most numerous on last whorl ; outer lip thickened. 



The only two specimens I have seen of this species are not 

 sufficiently perfect to admit of a more complete description. They 

 were found by Mr. Meyer in the Neocomian of East Shalford. 



Scalaria compacta, Sby., Dixon's Geology of Sussex, pi. xxvii. 



fig. 32. p. 349. 

 White Chalk, Sussex. 

 A small depressed species thus described in "Dixon's Geology of 

 Sussex : " Whorls rather square, close ; ribs very numerous, slightly 

 elevated. A very defective specimen is the only one we have seen 

 of this species." This small Scalaria evidently belongs to this group. 

 I have not seen the original. 



Scalaria Gastyna, d'Orb., Paleontol. Fr. p. 58. pi. 155. figs. 5-7. 

 Belongs to this group, but has not been found in England. The 

 shell so named in various lists of fossils is a Bissoina. 



^ Named after a friend, to whom I am indebted for much assistance rendered to 

 me whilst collecting. 



^ Plates III. and IV. illustrative of this paper will accompany the second part of 

 the article next month. 



3 Named after C. J. A. Meyer, Esq., F.G.S., to whom the discovery of this 

 species is due. 



