SPENXE : TROI'IDOPHOKA STANDENI. 43 



J. ^\^ Jackson. Type in my collection. Co-type in Manchester 

 Museum. 



It is only fair to add that when receiving the shells Messrs. Taylor 

 and Moss both noticed that they differed from trinitaria. 



TROPIDOPHORA STANDENI nov. sp. FROM MADAGASCAR. 

 By GEO. C. SPENCE. 



(Read before Llie Society, March i2lh, 1919). 



Plate I. 



Shell thin but strong, narrowly but deeply umbilicated, general 

 form as figured, somewhat shining. Apical whorls smooth, brown 

 fading to whitish on the upper portions of the whorls. Remainder 

 milk white with slightly oblique brown streaks across the whorls, the 

 colour being more accentuated on the encircling keels to which a 

 beaded appearance is imparted. Whorls 5^, convex with extremely 

 fine incremental strise-and, excepting the apex, encircled with numer- 

 ous strong raised keels (of which there are twelve on the body whorl, 

 including those visible within the umbilicus). Last third of body 

 whorl slightly and regularly descending. Aperture circular, interior 

 yellow tinted, fading to bluish in the throat, external keels showing 

 through as white lines. Corrugated within. Peristome thin, broadly 

 expanded, reflexed and crenulated at the edge. Outer posterior 

 portion with a large expanded notch while the columella expansion 

 threequarter covers the umbilicus. Margins connected by a thin 

 transparent callus. Operculum normal. 



Altitude, 27'5 mm.; maj. diam. 26"5 mm. 



Habitat Madagascar. 



This species, the unique type of which is in my collection, 

 resembles Tropidophora creplini Dkr., but is much larger and has in 

 addition the broadly expanded peristome described above with the 

 curious notch which calls to mind that found in Eutrochatella regina 

 Morelet. 



It is with much pleasure that 1 couple with this fine shell the name 

 of Mr. Robert Standen, who has for many years been my unfailing 

 friend and guide in conchological matters, as a slight acknowledgment 

 of his many kindnesses. In conclusion I wish to thank Mr. J. C. 

 Melvill and through him, Mr. H. C. Fulton, for the trouble taken and 

 opinions kindly expressed, and also Mr. J. W. Jackson for having 

 been so good as to take the accompanying photos. 



