BY C. HEDLEY. 483 



to Cantharidus pyrgos Philippi, already discussed in these 

 Studies.* 



Liotia affints A. Adams. 



A. Adams, Proc. Zool. Soc. 1850, p. 50; Ann. Mag. Nat. Hist. 

 (2) vii. April, 1851, p.332. 



(Plate vii., figs.6-7.) 



This unfigured species has been omitted from the last mono- 

 graph, and indeed from subsequent literature generally. But it 

 so closely approximates to the figure for L. scalaroides Reeve, 

 given by Adamsf himself as to suggest that the names are synony- 

 mous. 



The cotype from the British Museum has, as usual, been sadly 

 etched with acid. It may be described as follows : — 



Shell very solid, subglobose, narrowly perforate. Colour (in 

 present condition) white. Whorls five, the upper tabulate, the 

 lower rounder, descending wtih greater obliquity as growth 

 proceeds. Sculpture : the radials at last form oblique massive 

 waves; advancing down the whorls they become wider-spaced, 

 fewer and larger, so that the final whorl carries eight, including 

 the varix, but the penultimate eleven. Conversely the spirals 

 multiply while decreasing in comparative size; behind the aper- 

 ture are 18 small threads, but on the antepenultimate 4 large 

 ones. As each intercostal furrow runs into the umbilical border 

 it ends in a small pit. On the base a solid broad callus overlies 

 and swallows the ribs and surrounds the umbilicus. On the inner 

 edge the radials reappear as denticles, below it merges into the 

 peristome, above it winds as a screw-thread into the perforation. 

 Aperture small, circular. Operculum similar to that figured for 

 L. peronii.\ Height, 10mm; maj. diam. the same; minor 

 diam. 9 mm. 



The locality given is " Australia." What I recorded from 

 Masthead Island as L. scalarioides agrees with it It may be 



* These Proceedings, xxvi. p. 19. 



t Genera Mollusca, Pl.xlv. f.5c. 



+ Proc. Zool. Soc. 1850, Pl.viii. f.19. 



