The Invertebrate Fauna of the Uitenhage Series. 173 



In form and outline and in the shape of the aperture great resem- 

 blance is shown to the shell from the Stramberg beds figured by 

 Zittel :;: as Natica (Ampullina) elegans Sow. ; this differs, however, 

 by the slightly less overlap of the whorls and by the thinner shell ; 

 the inner lip is considerably less thickened than in the African form. 

 It seems doubtful whether the Stramberg shell is identical with the 

 English Portland Natica to which Sowerby gave the name IV. elegans, 

 and although Sowerby's figure t much resembles fig. 23a in plate 45 

 of Zittel's work, yet typical specimens of the Portland shell show a 

 higher spire. Natica uitenhagensis is well distinguished from the 

 English N. elegans by the much thicker shell and the lower spire. 

 The shells from the " Portlandien superieur " of Boulogne, ascribed 

 to Natica elegans Sow. by de Loriol and Pellat, { whose determina- 

 tion was accepted by Hudleston and Wilson, are also slightly 

 higher in the spire, and the aperture is broader and more rounded 

 below. 



The form described by Stanton as Lunatia constricta, from the 

 Belgrano beds of Patagonia, j| shows great similarity to N. uiten- 

 hagensis, but differs apparently by the more strongly impressed 

 sutures, the slightly less overlap of the whorls, and by the marked 

 transverse furrows. 



NATICA ROGERS: sp. nov. 

 Plate VIII., figs. 12, 12a, 13, 13a. 



Description. The shell is small, and consists of four whorls in 

 the specimens examined. The body-whorl overlaps a little less than 

 one-half of the preceding whorl, and occupies about two-thirds of 

 the whole height of the shell. The spiral suture is well impressed 

 or slightly channelled. The whorl-surface traced downwards from 

 the suture presents an evenly convex surface. 



The shell-wall is rather thick. The surface is marked by numerous 

 transverse lines of growth and there is also a tendency to produce 

 coarser, rounded, transverse ridges and furrows. The spiral angle 

 is about 90. The mouth aperture is broadly rounded below and 

 narrowed and somewhat pointed above. The height of the aper- 

 ture does not greatly exceed the breadth. The outer lip is sharp. 

 Below, the margin of the aperture is thickened. On the inner side 



* Zittel (4), p. 289, Taf. 45, fig. 23. 



f J. de C. Sowerby (2), p. 347, pi. xxiii., fig. 3. 



{ de Loriol and Pellat (1), p. 27, pi. iii., figs. 13-15. 



Hudleston and Wilson (1), p. 81. 



|| Stanton (3), p. 31, pi. vi., figs. 10, 11. 



